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 [Search a list of Patent Appplications for class 210]   CLASS 210,LIQUID PURIFICATION OR SEPARATION
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SECTION I - CLASS DEFINITION

STATEMENT OF CLASS SUBJECT MATTER

This is the primary class for patents directed to treating water or waste liquid, and when not more specifically provided for, the class for patents directed to treating liquids in general or of any kind and provides (1) process and apparatus for (a) separating a component from (b) purifying or (c) effecting a change in water or waste liquid, such process or apparatus not being more specifically provided for in another class; (2) process of treating liquids in general and treating liquid compositions of either general or diverse utilities; (3) apparatus not provided for in other classes, for performing the foregoing processes and treating liquids of any kind; (4) filter materials or compositions peculiar to the above-mentioned processes; and (5) Processes for purification of liquids containing hazardous or toxic waste to produce a nonhazardous or nontoxic product.

SECTION II - LINES WITH OTHER CLASSES AND WITHIN THIS CLASS

A. GENERAL GUIDELINESS

1. Placement of Patents

a. A claim directed to the production, regeneration, or purification of a particular compound or composition (including) solutions in water is classified with the particular compound or composition. The classes providing for these compounds or compositions are set out in section III, B, 2.

A claim directed to purification or separation of water or of liquids in general with disclosure of several species each differently classifiable is classified in this class (210).

b. In classifying a claim to a combined process in which a liquid (e.g., sewage, etc.) is treated, and a useful by-product, energy or treatment is also recovered or achieved, placement is in Class 210 where the primary purpose is liquid treatment and the by-product, energy or other treatment is incidental. Placement is in the other pertinent class if the liquid treatment is incidental to the other process. If it cannot be determined which is the primary purpose of the combined process, placement is in the appropriate chemical class(es) when a chemical by-product is recovered and in this class (210) in all other instances.

Since the identical combined process may be placed as an original in either of two classes, based on intent of the inventor, a cross-reference copy should be placed in the other class involved.

See section II, A, 2 infra, for exceptions to the general rule here stated.

2.. Specific Exceptions.

a. Class 95, Gas Separation: Processes, will take a process including a liquid separation step in a Class 95 operation (e.g., regenerating a scrubbing liquid in a gas scrubbing operation, etc.).

b. A purely physical separation, e.g., filtering, specifically directed to mineral oil, is classified in this class (210), subclasses 767+.

c. A claim to a process of drying a flowable slurry or mass by physical separation, e.g., centrifuging without a step or means of contacting with a gas, is in this class (210) rather than Class 34. See line note to Class 210 in (3) Note to Class 34 definition.

d. Some classes which provide for compositions which may be used in a Class 210 process may also take a claim to a mere use of such composition. These classes include 424 and 521 and the line notes in section II, C set out the conditions which govern placement of patents in these circumstances.

e. The rehabilitation or regeneration of a filter medium, in situ is classified in this class (210), subclasses 791+, rather than in Class 134, Cleaning and Liquid Contact With Solids.

f. Separating liquids by direct application of electrolysis or electric force to the liquid, alone or combined with a step provided for in subclasses 767-808 of this class, is classified in Class 205, Electrolysis: Processes, Compositions Used Therein, and Methods of Preparing the Compositions, when electrolysis is involved, or in Class 204, Chemistry: Electrical and Wave Energy, when other electrical force as provided for in the Class 204 definition is involved.

B. CLASSES PROVIDING FOR RELATED SUBJECT MATTER.

1. Classes Providing A Specific Unit Operation Treatment Of Liquids.

References to Other Classes, below, contains classes pertaining to the following specific unit operation treatment of liquids.

Analyzing:

Burning;

Chlorinating;

Condensing;

Crystal Forming, Single;

Crystallization;

Degassing;

Disinfecting;

Dispensing;

Distilling;

Drinking Storage;

Electrolysis;

Emulsifying;

Evaporating;

Fluoridating;

Freezing;

Handling;

Heating;

Magnetizing;

Mixing;

Preserving;

Refrigerating;

Separating, Centrifugally;

Softening;

Sprinkling, Spraying, Diffusing;

Sterilizing;

Storage;

Testing;

Transporting;

2. Classes Providing Treatment Of A Specific Liquid.

References to Other Classes, below, contains classes pertaining to the following treatment of a specific liquid.

Beverage;

Black Liquor;

Cleaning Fluid;

Colloids;

Coolant;

Culture Broth;

Detergent;

Drug;

Dye;

Electrolyte;

Emulsion;

Fats;

Fertilizer;

Food;

Fuel;

Ink;

Inorganic;

Lubricants;

Medicine;

Oil;

Paints;

Photographic;

3. Classes Having Liquid Treating Apparatus.

References to Other Classes, below, contains classes having liquid treating apparatus in the following art areas.

Analysis;

Carbureting;

Cooling;

Crystal Forming, Single;

Crystallizer;

Dispensing;

Distilling;

Evaporating;

Gas Contact;

Handling;

Heat Exchange;

Mixing;

Oil Refining;

Packing;

Preserving;

Reaction (Chemical);

Reaction, Physical;

SECTION III - REFERENCES TO OTHER CLASSES

SEE OR SEARCH CLASS:

8Bleaching and Dyeing; Fluid Treatment Chemical Modification of Textiles and Fibers,   appropriate subclasses for a purification process claimed or solely disclosed for a dye composition.
8Bleaching and Dyeing; Fluid Treatment and Chemical Modification of Textiles and Fibers,   (Class Providing Treatment Of A Specific Liquid--Dye).
15Brushing, Scrubbing, and General Cleaning,   appropriate subclasses for apparatus which may remove a liquid from a solid by means provided for in that class (15), particularly subclass 1.7 for submerged cleaners; and subclass 246.5 for tank cleaners.
19Textiles: Fiber Preparation,   appropriate subclasses which may involve the manufacture of a filter element, particularly subclasses 144+ for the bringing together of fibers with relation to each other to form a coherent mass.
23Chemistry: Physical Processes,   subclasses 293+ for a physical purification process claimed or solely disclosed for an inorganic compound or nonmetallic element (or solution with no art use).
23Chemistry: Physical Processes,   subclasses 230+ . (Class Providing A Specific Unit Operation Treatment Of Liquids--Testing).
34Drying and Gas or Vapor Contact With Solids,   appropriate subclasses. See the note to the class definition of Class 34 for the line with Class 210.
44Fuel and Related Compositions,   especially subclasses 300+ for a purification process claimed or solely disclosed for liquid fuel.
44Fuel and Related Compositions,   (Class Providing Treatment Of A Specific Liquid--Oil).
44Fuel and Related Compositions,   (Class Providing Treatment Of A Specific Liquid--Fuel).
51Abrasive Tool Making Process, Material, or Composition,   for a purification process claimed or solely disclosed for an abrading composition.
53Package Making,   (Class Having Liquid Treating Apparatus--Packing).
53Package Making,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Preserving).
53Package Making,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Storage).
62Refrigeration,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Condensign).
62Refrigeration,   subclasses 600+ for a separating or purification process for liquified gas.
62Refrigeration,   subclasses 66+ and 532+. (Class Providing A Specific Unit Operation Treatment Of Liquids--Crystallization).
62Refrigeration,   especially subclasses 56+ . (Class Providing A Specific Unit Operation Treatment Of Liquids--Freezing).
62Refrigeration,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Refrigerating).
62Refrigeration,   (Class Having Liquid Treating Apparatus--Cooling).
68Textiles: Fluid Treating Apparatus,   subclass 1 and 18 for means to reclaim and revise a solvent combined with a laundry machine.
71Chemistry: Fertilizers,   (Class Providing Treatment Of A Specific Liquid--Fertilizer).
71Chemistry: Fertilizers,   appropriate subclasses for fertilizer producing processes including more than mere treatment of sewage or waste liquids for this class (210); and for a purification process claimed or solely disclosed for a fertilizer composition.
73Measuring and Testing,   especially subclasses 32+ , 53+, 149, 170.29+, 861+, 290+, Dig. 5+, and Dig. 8. (Class Providing A Specific Unit Operation Treatment Of Liquids--Testing)
75Specialized Metallurgical Processes, Compositions for Use Therein, Consolidated Metal Powder Compositions, and Loose Metal Particulate Mixtures,   appropriate subclasses for a separating or purification process that produces a metal; and especially subclass 2 for beneficiating ores by chemical treatment and flotation; and subclasses 97+ for hydrometallurgical processes, particularly subclasses 101+ for chemical leaching.
95Gas Separation: Processes,   for processes involving steps resulting in separation of a gas from a fluid mixture comprising (a) a gas and solid or liquid particles entrained therein, (b) a liquid and gas entrained therein, or (c) a plurality of gases. Class 210 is superior to Class 95 and takes separating processes, per se, generically disclosed or claimed as fluid separation or if the disclosure or a claim is restricted to liquid separation. Class 210 also takes processes which remove or vent gas formed incidentally to the handling of the fluid mixture or as a result of a Class 210 treatment (see particularly subclasses 603 , 640, 664, 718, and 750). However, Class 95 takes processes operating to remove gas initially present in an inflowing liquid mixture, with or without liquid separation. The removal of a volatile organic compound (e.g., ethanol (C2H5OH), gasoline, etc.) from a liquid is not taken to be degasification of a liquid for Class 95 when the volatile organic compound is initially present as a liquid mixed with another liquid. The removal of a volatile organic compound from a liquid may be found in Class 210 for liquid purification or separation or Class 203 for separatory distillation processes. Class 95 will also take a process including a liquid separation step in a Class 95 operation (e.g., regenerating a scrubbing liquid in a gas scrubbing operation).
95Gas Separation: Processes,   especially subclasses 241+ . (Class Providing A Specific Unit Operation Treatment Of Liquids--Degassing).
96Gas Separation: Apparatus,   especially subclasses 155+ . (Class Providing A Specific Unit Operation Treatment Of Liquids--Degassing).
96Gas Separation: Apparatus,   for apparatus used in separation of a gas from a fluid mixture comprising (a) a gas and solid or liquid particles entrained therein, (b) a liquid and gas entrained therein, or (c) a plurality of gases. Class 210 is superior to Class 96 and takes separating apparatus, per se, generically disclosed or claimed for use in fluid separation or if the disclosure or a claim is restricted to liquid separation apparatus. Class 210 also takes apparatus which removes or vents gas formed incidentally to the handling of the fluid mixture or as a result of a Class 210 treatment (see particularly subclasses 120 , 180, 188, 218, 406, and 436). However, Class 96 takes apparatus operating to remove gas initially present in an inflowing liquid mixture, with or without liquid separation. Apparatus for the removal of a volatile organic compound (e.g., ethanol (C2H5OH), gasoline, etc.) from a liquid is not taken to be apparatus for the degasification of a liquid for Class 96 when the volatile organic compound is initially present as a liquid mixed with another liquid. Apparatus for the removal of a volatile organic compound from a liquid may be found in Class 210 for liquid purification or separation or Class 202 for separatory distillation. Class 96 will also take apparatus including a liquid separation means in a Class 96, Gas Separation: Apparatus (e.g., means to regenerate a scrubbing liquid in a gas scrubbing apparatus, etc.).
99Foods and Beverages: Apparatus,   appropriate subclasses for apparatus of the type classified in this class (210) when combined with other food or beverage preparation means; and subclasses 457+ and 495+ for separation apparatus wherein a liquid is separated.
100Presses,   subclass 37 for process of separation of liquid from expressed material; and subclasses 104+ for presses having drain means for expressed liquids, and see the reference to Class 210 in the class definition for the general line.
106Compositions: Coating or Plastic,   appropriate subclasses for a purification or regeneration by separation process which is claimed or solely disclosed for a composition or ingredient of that class.
106Compositions: Coating or Plastic,   subclasses 31.13+ . (Class Providing Treatment Of A Specific Liquid--Ink).
106Compositions: Coating or Plastic,   (Class Providing Treatment Of A Specific Liquid--Paints
110Furnaces,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Burning).
117Single-Crystal, Oriented-Crystal, and Epitaxy Growth Processes; Non-Coating Apparatus Therefor,   (Class Having Liquid Treating Apparatus--Crystal Forming, Single).
117Single-Crystal, Oriented-Crystal, and Epitaxy Growth Processes; Non-Coating Apparatus Therefor,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Single Crystal Forming).
122Liquid Heaters and Vaporizers,   appropriate subclasses for conversion of liquid to vapor by application of heat.
122Liquid Heaters and Vaporizers,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Heating).
126Stoves and Furnaces,   subclasses 344 through 363.1for a liquid heater that may include a kettle, a steam generator, stove pipe for use with a stove, a domestic water heater or boiler (e.g., kitchen boiler, range boiler, etc.) for use with a stove or furnace.
127Sugar, Starch, and Carbohydrates,   appropriate subclasses for processes and apparatus peculiar to the treatment of such materials.
128Surgery,   appropriate subclasses for a process of or apparatus for purifying or separating the fluid (e.g., blood) of a living animal body, combined with a claimed specifically detailed step or means of removing or returning the fluid from or to the body. A method of treating the fluid including a nominally recital step of or means for removing or returning the fluid from or to a patient will be placed in this class (210). Similarly, a process of or apparatus for purifying or separating such a fluid combined with a step of or means for monitoring a condition of the body to control the purifying or separating will be placed in Class 128, Surgery. Terms as "withdrawing", "injecting", and "needle", are considered nominal while withdrawing from a named artery or vein or structurally defining a needle are considered specific detail.
134Cleaning and Liquid Contact With Solids,   and see Note (4) of the definition of that class for the line with Class 210.
137Fluid Handling,   (Class Having Liquid Treating Apparatus--Handling).
137Fluid Handling,   appropriate subclasses for fluid handling generally, particularly subclasses 1+ for processes; and subclasses 98+ for proportional flow systems, as chemical feeders.
137Fluid Handling,   subclasses 1+ . (Class Providing A Specific Unit Operation Treatment Of Liquids--Transporting).
137Fluid Handling,   subclasses 1+ . (Class Providing A Specific Unit Operation Treatment Of Liquids--Handling).
141Fluent Material Handling, With Receiver or Receiver Coacting Means,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Dispensing)
141Fluent Material Handling, With Receiver or Receiver Coacting Means,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Handling).
141Fluent Material Handling, With Receiver or Receiver Coacting Means,   (Class Having Liquid Treating Apparatus--Dispensing).
159Concentrating Evaporators,   subclasses 47.1+ (Class Providing A Specific Unit Operation Treatment Of Liquids--Evaporating).
159Concentrating Evaporators,   (Class Having Liquid Treating Apparatus--Evaporating).
162Paper Making and Fiber Liberation,   (Class Providing Treatment Of A Specific Liquid--Black Liquor).
162Paper Making and Fiber Liberation,   appropriate subclasses for processes and apparatus for making paper by depositing fibers from a slurry on a foraminous screen. Where the screening step is for the purpose of dewatering the slurry and a formless mass of fibers is produced rather than a felted product, the patent is classified in Class 210. Where there is a disclosure of a felted self-sustaining product being produced by the dewatering step or means are provided to remove the product intact from the mold, the patent is classified in Class 162.
165Heat Exchange,   (Class Having Liquid Treating Apparatus--
165Heat Exchange,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Refrigerating).
165Heat Exchange,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Condensign).
165Heat Exchange,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Heating).
165Heat Exchange,   (Class Having Liquid Treating Apparatus--Cooling).
166Wells,   subclasses 265+ for well processes involving separation of fluids leaving the well, appropriate subclasses for corresponding well apparatus; subclasses 311+ and subclasses there noted for processes of cleaning wells, and appropriate subclasses for corresponding apparatus; subclasses 227+ and subclasses there noted for well screens; and see subclass 227 for the line between Classes 210 and 166 as to screens.
196Mineral Oils: Apparatus,   (Class Having Liquid Treating Apparatus--Oil Refining).
196Mineral Oils: Apparatus,   for apparatus peculiar to mineral oil treatment other than by mere manipulative treatment for this class (210), particularly subclass 14.5 for dewaxing apparatus; and subclass 46.1 for refining apparatus including a filter in combination.
202Distillation: Apparatus,   appropriate subclasses for distillation apparatus with or without separation means of the type classified in Class 210.
202Distillation: Apparatus,   (Class Having Liquid Treating Apparatus--Distilling).
203Distillation: Processes, Separatory,   subclasses 28+ and 39+ for a liquid distillation process including a chemical treating step or a disparate physical separating step not otherwise provided for.
203Distillation: Processes, Separatory,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Distlling).
204Chemistry: Electrical and Wave Energy,   for the separation or purification of a liquid solely by the application of an electrical force directly to the liquid or when combined with a separation step classifiable in Class 210, subclasses 767 through 808.Exemplary is electro-osmosis with or without filtration or electrophoresis with or without gravitational setting. A Class 204 step combined with a Class 210 process provided for higher in the Class 210 schedule than subclasses 767-808 is classifiable in Class 210. Such combinations are exemplified by sorption plus electro-osmosis, precipitation plus electrophoresis, etc. Class 204 also takes a combined process which may include a preparatory liquid purification step for the process. See the reference to Class 210 in the Class 204 definition, References to Other Classes section for an elaboration of the class line between Class 204 and Class 210.
205Electrolysis: Processes, Compositions Used Therein, and Methods of Preparing the Compositions,   appropriate subclasses for an electrolytic process which may include a preparatory liquid purification step for the process, for a composition intended for use in such a process (e.g., electrolyte, etc.), for a process of regenerating or rehabilitating an electrolyte composition used or intended to be used for electrolysis as designated for Class 205, and subclasses 775 through 794.5for electrolytic analysis or testing. A Class 205 step combined with a Class 210 process provided for higher in the schedule than subclasses 767-808 is classifiable in Class 210. Such combinations are exemplified by aerobic digestion plus electrolysis, etc. Class 205 also takes an electrolytic process which may include a preparatory liquid purification step for the process.
208Mineral Oils: Processes and Products,   for a purification or separation claimed as solely disclosed for mineral oil and which is not purely a physical operation as provided for in subclasses 767+ of this class (210). Class 210, in subclasses 767+ provides for merely physically separating a mineral oil as by filtering, settling decanting, etc. Class 208 provides for chemical, including sorption and solvent, processes for purifying or separating a mineral oil.
208Mineral Oils: Processes and Products,   (Class Providing Treatment Of A Specific Liquid--Lubricants).
208Mineral Oils: Processes and Products,   (Class Providing Treatment Of A Specific Liquid--Oil).
208Mineral Oils: Processes and Products,   (Class Providing Treatment Of A Specific Liquid--Fuel).
209Classifying, Separating, and Assorting Solids,   appropriate subclasses, and see the reference to Class 210 under (3) Note of the class definition of Class 209 for the general line.
219Electric Heating,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Heating).
222Dispensing,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Dispensing)
222Dispensing,   (Class Having Liquid Treating Apparatus--Dispensing).
239Fluid Sprinkling, Spraying, and Diffusing,   appropriate subclasses for separating means incidental or ancillary to handling a fluid to be sprinkled or sprayed, especially subclasses 86 , 462, 553+, 575, and 590+ for nozzle structures in which filtering means are present or are inherent in the nozzle.
239Fluid Sprinkling, Spraying, and Diffusing,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Handling).
239Fluid Sprinkling, Spraying, and Diffusing,   subclasses 1+ . (Class Providing A Specific Unit Operation Treatment Of Liquids--Sprinkling, Spraying, Diffusing).
241Solid Material Comminution or Disintegration,   subclasses 24 and 68+ for the comminution of solids combined with the separation of liquid therefrom. See section 8 of the class definition of Class 241 for the line with Class 210.
250Radiant Energy,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Sterilizing).
250Radiant Energy,   subclasses 527+ . (Class Having Liquid Treating Apparatus--Reaction (Chemical)).
252Compositions,   subclasses 175+ . (Class Providing A Specific Unit Operation Treatment Of Liquids--Softening).
252Compositions,   subclasses 380+ . (Class Providing A Specific Unit Operation Treatment Of Liquids--Preserving).
252Compositions,   appropriate subclasses for a purification or separation claimed or solely disclosed for a composition classifiable in that class, and search subclasses 61 and 175+ for a composition which may be used in a liquid purification or separation process of this class. Class 252 provides for a purification or separation process specific to a single type of composition by claim or by sole disclosure. Class 210 provides for a purification or separation process generic to several types of compositions, all of which may be classified in Class 252 (e.g., perfumes and denaturants; detergents; fire extinguishing and heat exchange materials). Class 252 provides for certain compositions for use in Class 210 processes and for a process, per se, of regenerating or rehabilitating them. The use of these compositions in a liquid purification or separation, per se, or combined with regenerating them is provided for in Class 210.
252Compositions,   subclasses 71+ . (Class Providing Treatment Of A Specific Liquid--Coolant).
252Compositions,   various subclasses based on function of emulsion. (Class Providing A Specific Unit Operation Treatment Of Liquids--Emulsifying).
260Chemistry of Carbon Compounds,   appropriate subclasses for such compounds and related compound producing or treating processes, particularly subclasses 704+ for general physical treatment processes peculiar to carbon compounds, and see the references to Class 210 in the class definition.
261Gas and Liquid Contact Apparatus,   subclasses 2+ for separating means combined with apparatus to produce an intimate contact between gases and liquids to exchange properties or mutually modify conditions.
261Gas and Liquid Contact Apparatus,   (Class Having Liquid Treating Apparatus--Gas Contact).
261Gas and Liquid Contact Apparatus,   (Class Having Liquid Treating Apparatus--Carbureting).
264Plastic and Nonmetallic Article Shaping or Treating: Processes,   appropriate subclasses for processes for shaping or molding plastic materials within the class definition, which may involve the manufacture or use of fiber elements or separators, or porous articles, per se.
324Electricity: Measuring and Testing,   especially subclasses 29+ , 71+, 204, 425+, and 459+. (Class Providing A Specific Unit Operation Treatment Of Liquids--Testing).
335Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Magnetizing).
361Electricity: Electrical Systems and Devices,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Magnetizing).
366Agitating,   (Class Having Liquid Treating Apparatus--Mixing).
366Agitating,   subclasses 2+ and 348. (Class Providing A Specific Unit Operation Treatment Of Liquids--Mixing).
399Electrophotography,   subclass 250 for liquid carrier condensation of liquid developer material within an electrophotographic device.
406Conveyors: Fluid Current,   especially subclasses 168+ and 197 for transporting a solid by suspending it in a fluid and separating the solid from the liquid after transporting.
406Conveyors: Fluent Current,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Transporting).
422Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,   for a process of treating water to prevent corrosion of a conduit or a container and for chemical apparatus of general utility.
422Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,   subclasses 243+ . (Class Having Liquid Treating Apparatus--Reaction, Physical).
422Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,   (Class Having Liquid Treating Apparatus--Preserving).
422Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,   subclasses 129+ . (Class Having Liquid Treating Apparatus--Reaction (Chemical)).
422Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,   subclasses 245.1+ for non-coating means not including means for chemical reaction and not provided for elsewhere. (Class Having Liquid Treating Apparatus--Crystallizer.
422Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,   subclasses 13 and 14+. (Class Providing A Specific Unit Operation Treatment Of Liquids--Softening).
422Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,   subclasses 1+ . (Class Providing A Specific Unit Operation Treatment Of Liquids--Preserving).
422Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Storage).
422Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,   subclasses 50+ . (Class Having Liquid Treating Apparatus--Analysis).
423Chemistry of Inorganic Compounds,   appropriate subclasses for chemical manufacturing involving a chemical reaction and for extracting, leaching, or dissolving not elsewhere provided for.
423Chemistry of Inorganic Compounds,   (Class Providing Treatment Of A Specific Liquid--Inorganic).
424Drug, Bio-Affecting and Body Treating Compositions,   (Class Providing Treatment Of A Specific Liquid--Drug).
424Drug, Bio-Affecting and Body Treating Compositions,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Disinfecting).
424Drug, Bio-Affecting and Body Treating Compositions,   especially subclasses 661+ . (Class Providing A Specific Unit Operation Treatment Of Liquids--Chlorinating).
424Drug, Bio-Affecting and Body Treating Compositions,   subclasses 56+ . (Class Providing A Specific Unit Operation Treatment Of Liquids--Fluoridating).
424and 514, Drug, Bio-Affecting and Body Treating Compositions,   especially Class 424, subclasses 127+ and Class 514, subclasses 1+. (Class Providing A Specific Unit Operation Treatment Of Liquids--Sterilizing).
424Drug, Bio-Affecting and Body Treating Compositions,   (Class Providing Treatment Of A Specific Liquid--Medicine).
426Food or Edible Material: Processes, Compositions, and Products,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Preserving).
426Food or Edible Material Processes, Compositions, and Products,   (Class Providing Treatment Of A Specific Liquid--Beverage).
426Food or Edible Material: Processes, Compositions, and Products,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Storage).
426Food or Edible Material: Processes, Compositions, and Products,   appropriate subclasses for (a) process of the type classified in this class (210) when combined with other food working operations, or (b) a process of the type classified in this class (210), which process is limited to treatment of a food or edible material except water.
426Food or Edible Material: Processes, Compositions, and Products,   (Class Providing Treatment Of A Specific Liquid--Food).
426Food or Edible Material: Processes, Compositions, and Products,   subclasses 66+ . (Class Providing A Specific Unit Operation Treatment Of Liquids--Drinkign Storage).
429Chemistry: Electrical Current Producing Apparatus, Product, and Process,   especially subclasses 101 through 109,188-207, and 408-412. (Class Providing Treatment of a Specific Liquid).
430Radiation Imagery Chemistry: Process, Composition, or Product Thereof,   (Class Providing Treatment Of A Specific Liquid--Emulsion).
430Radiation Imagery Chemistry: Process, Composition, or Product Thereof,   (Class Providing Treatment Of A Specific Liquid--Photographic).
431Combustion,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Burning).
432Heating,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Heating).
435Chemistry: Molecular Biology and Microbiology,   (Class Providing Treatment Of A Specific Liquid--Culture Broth).
436Chemistry: Analytical and Immunological Testing,   subclasses 1+ and 129.2+. (Classes Providing A Specific Unit Operation Treatment Of Liquids--Analyzing).
494Imperforate Bowl: Centrifugal Separators,   appropriate subclasses, for apparatus and process for breaking up a mixture of fluids or fluent substances into two or more components by centrifuging within a generally solid-walled, receptacle-like member.
494Imperforate Bowl: Centrifugal Separators,   (Class Providing A Specific Unit Operation Treatment Of Liquids--Centrifugally separating).
502Catalyst, Solid Sorbent, or Support Therefor: Product or Process of Making,   for a composition comprising a catalyst or sorbent, per se.
504Plant Protecting and Regulating Compositions,   subclasses 150+ for compositions designed or intended for retarding, inhibiting, or killing algae and the processes of using such compositions or compounds which are no more than the mere application of the compounds or the compositions.
508Solid Anti-friction Devices, Materials Therefor, Lubricant or Separant Compositions for Moving Solid Surfaces, and Miscellaneous Mineral Oil Compositions,   particularly subclasses 110+ . (Class Providing Treatment Of A Specific Liquid--Lubricants).
508Solid Anti-friction Devices, Materials Therefor, Lubricant or Separant Compositions for Moving Solid Surfaces, and Miscellaneous Mineral Oil Compositions,   particularly subclasses 110+ . (Class Providing Treatment Of A Specific Liquid--Oil).
510Cleaning Compositions for Solid Surfaces, Auxiliary Compositions Therefor, or Processes of Preparing the Compositions,   (Class Providing Treatment Of A Specific Liquid Detergent).
510Cleaning Compositions for Solid Surfaces, Auxiliary Compositions Therefor, or Processes of Preparing the Compositions,   appropriate subclasses, especially subclasses 285+ , 405+, etc. (Class Providing Treatment Of A Specific Liquid--Cleaning Fluid).
514Drug, Bio-Affecting and Body Treating Compositions,   especially subclasses 939+ . (Class Providing Treatment Of A Specific Liquid--Emulsion).
516Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting,   appropriate subclasses for subject matter relating to: colloid systems (such as sols*, emulsions, dispersions, foams, aerosols, smokes, gels, or pastes) or wetting agents (such as leveling, penetrating, or spreading); subcombination compositions of colloid systems containing at least an agent specialized and designed for or peculiar to use in making or stabilizing colloid systems; compositions and subcombination compositions specialized and designed for or peculiar to use in breaking (resolving) or inhibiting colloid systems; processes of making the compositions or systems of the class; processes of breaking (resolving) or inhibiting colloid systems; in each instance, when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art. Class 516 is the locus for the breaking of colloid systems generically claimed and provides for (a) the separation or purification of liquids, generally claimed, when performed by a Class 516 process, such as by breaking an emulsion, dispersion, or foam, and for such processes further including ancillary steps, such as, decanting, or passing through a separatory funnel, etc., or (b) processes in which recovery is intended of both water and another product. Class 210 provides for (a) processes which include a step of colloid system resolution of liquids, generally claimed, when combined with a step of separation of a diverse component, unless that step is also a Class 516 step (i.e., multiple Class 516 steps are proper for placement in Class 516), or (b) a step of colloid system breaking, per se, for the purpose of obtaining water, wherein the water may be intended for use or intended to be made suitable for disposal, thus, decontaminating of sewage waste water to be dumped into the ocean using an emulsion breaking step is proper for Class 210. (Class Providing A Specific Unit Operation Treatment Of Liquids--Emulsifying) (Class Providing Treatment Of A Specific Liquid Colloids) (Class Providing Treatment Of A Specific Liquid Emulsion).
520Series, Synthetic Resins or Natural Rubbers,   (Class Providing Treatment Of A Specific Liquid--Paints).
520Synthetic Resins or Natural Rubbers,   particularly Classes 523 and 524. (Class Providing Treatment Of A Specific Liquid--Emulsion).
554Organic Compounds,   subclasses 1+ . (Class Providing Treatment Of A Specific Liquid--Fats).
585Chemistry of Hydrocarbon Compounds,   subclass 14 . (Class Providing Treatment Of A Specific Liquid--Fuel).
588Hazardous or Toxic Waste Destruction or Containment,   subclasses 300 through 415and 249-260, for the chemical destruction or containment of hazardous or toxic waste. Class 210 provides for the purification of water (liquids) as useful product even though hazardous or toxic waste may be removed from or destroyed in the water (liquids).

SECTION IV - GLOSSARY

The meaning to be given various "Art" terms appearing in this class, but which have not been included in the GLOSSARY below, is the same as that generally accepted or in common usage.

ABSORB

See SORB.

ACCELERATOR

Agent which promotes an action, but does not necessarily cause the action. An example is a catalyst as contrasted with a reactant. In subclasses 696+ and 702+ no distinction is made between an agent which promotes or one which causes and a search for a compound used as a flocculant is the same as if the compound reacted to cause precipitation.

ACTIVATED SLUDGE

Common term for an aerobic process of treating sewage with micro-organisms in which part of the settled sludge from the treatment is diverted and introduced into the feed of incoming sewage.

ADDITIVE

An agent added to a liquid being treated to either cause a desired result or to promote a result which would occur more slowly or incompletely without the additive. Catalysts filter aids, chemical agents, seeding agents, buffers are all additives.

ADSORB

See SORB.

AEROBIC

Treating liquids, generally sewage, with micro-organisms in the presence of oxygen generally supplied as air or other source of oxygen but sometimes using residual dissolved oxygen. Best known method is "activated sludge". The micro-organisms convert noxious materials to less noxious stuff, e.g., to water, methane, nitrogen oxides, carbon dioxide.

ALGAECIDE

Any material capable of inhibiting or destroying algal growth.

ANAEROBIC

Treating liquids, generally sewage by micro-organisms which change noxious stuff to innocuous materials, in the absence of oxygen. Some solids are made into water and gases as methane, carbon monoxide, etc. A septic tank is an example of anaerobic digestion of sewage.

ANGSTROM

A unit of length used to measure wavelength of lights and diameters of atoms or molecules.

Designated by A and equal to 10-8cm.

AQUEOUS

A liquid containing water. Generally water is the major part as in blood, brine, milk, etc., but may comprise a substantial but not major portion as in a water-alcohol mixture of various proportions. Usually trace amounts of water are not considered aqueous.

BACTERICIDE

Any material capable of inhibiting or destroying bacteria.

BRACKISH

Somewhat salty, but substantially less so than sea water.

BRINE

A relatively concentrated salt water solution sometimes from wells or industrial sources and including sea water.

CENTRIFUGE

A process or means in which a liquid is revolved about an axis at such a number of revolutions per unit of time that the apparent weight of constituents increases to a point where the constituents tend to concentrate in strata similar to gravity-induced separation based on relative densities.

CHROMATOGRAPHY

A process in which a liquid is flowed along a linear path comprising a sorbent, with which the liquid competes in affinity for a constituent of the liquid. The constituent is sorbed from the moving liquid by the relatively immobile sorbent and redissolved by a later passing portion of the liquid until an equilibrium of the sorbing-dissolving step is set up causing the constituent to concentrate in a specific volume of the sorbent and to move along the path of the liquid at a slower rate than such liquid.

A comprehensive treatise on chromatography is to be found in Kirk-Othmer Encyclopedia of Chemical Technology 2nd ed. Vol. 5, pp. 413-450.

COALESCE

The merging together of small droplets or particles of a material or constituent dispersed in a liquid to form larger bodies of the material or constituent which may be more easily handled.

COLLOIDAL

A state of very fine division of a material dispersed throughout a liquid almost to the point of a true solution and either impossible or extremely difficult to filter or cause to settle.

CONDUCTIVITY WATER

An extremely pure water characterized by high ohmic resistance due to very low rate of ionization. See POLISHING.

CYCLONE

A device using centrifugal force to separate. The process is called cyclonic; see centrifuge.

DESALINATION

The process of removing inorganic salts, most usually sodium chloride, from water.

DIALYSATE

See DIALYSIS.

DIALYSIS

A process of separating a dissolved constituent from a liquid by transport or migration from the liquid through a membrane into a second liquid. The membrane may be semipermeable or the second liquid may have greater affinity for the constituent but the net effect of the combined membrane-extracting liquid is to selectively remove a constituent from the first liquid. The process is provided for in subclasses 644+. An in-depth explanation is given in Kirk Othmer Encyclopedia of Chemical Technology 2nd ed. Vol. 7, pp. 1-20. Dialysate is the product of a dialysis method and the term is not always used for the same product, including retentate and diffusate.

DIFFUSATE

The material passed through in a diffusing process.

DIFFUSE

The passing of a constituent through a membrane or septum.

DIGEST

Process in which material is acted upon by micro-organisms to cause a chemical change. The composting of sludge is a digestion process.

DISPERSION

A mixture of a liquid with an insoluble material in very fine subdivision almost but not quite a true solution.

EFFLUENT

The liquids flowing out of a process, normally the mainstream, can be either a desired product or discard.

FEED

The liquid to be treated, prior to processing.

FILTER

Method of and apparatus for removing solid particles from a liquid by passing the same through a medium with openings smaller than the particles. Microfiltration is filtration down to coolidal and polymeric molecular size. Ultrafiltration and hyperfiltration are more likely transport or diffusion across a membrane process but are called filtration down to molecular and ionic size. See subclasses 650 and 652.

FILTER ELEMENT

Filter medium combined with supporting structure or having a specified shape.

FILTER MEDIUM

Solid separating material or member for separating a constituent from the prefilt due to openings between material particles or in the member.

FILTRATE

Liquid which has been clarified by passing it through a filter medium.

FILTRATION

The separation of solids from a liquid or a liquid from liquids by a solid separating medium due to openings in the medium or between discrete particles.

FLOC

Flocculated clumps of suspended or dispersed small particles resulting from accretion and used as sites for further accretion of suspended matter. See subclass 715.

FLOCCULATION

A clumping together of finely divided particles of material dispersed in a liquid to a state where filtration or settling of the material is possible. See subclasses 702+.

FLUID

Material that flows, generally gas or liquid but sometimes including mixtures of these with particulate solids such as slurry, sludge, gels, etc. Some materials are thixatropic, i.e., fluid when agitated but jellylike when at rest. Pumpable sludge is considered a liquid for treatment in this class.

FOULING

The act of depositing on the membrane surface something which will impede its proper functioning. Sometimes also termed "blinding".

GEL

A colloidal dispersion of a solid in a liquid with a jellylike texture. Use of a gel in chromatography is in subclass 635, and separating the constituents of a gel are in subclass 702.

GRAVITY, BY

A separation process depending on differences in density to separate freely movable constituents such as cream rising to the top of the milk. Draining or allowing a liquid to drip from solids held by a screen or grid is not gravity separation.

HYDROPHILIC

Water attractive or wettable.

HYDROPHOBIC

Water-repellent or nonwettable.

HYPERFILTRATION

Filtration to the ultimate degree to molecular or ionic size, but most likely membrane transport or diffusion phenomenon. See FILTER and subclass 652.

IMHOFF

A two-story septic tank of special design to allow digestion of sludge in lower chamber with settling in upper chamber and passage of settled sludge from upper to lower chamber. Process is anaerobic and provided for in subclasses 602+.

INERT MATERIAL

Stuff that does not cause or promote any change in liquid or component being treated. May act as filler, support, or carrier for active material. See subclass 679.

LIQUID

A flowable material comprising at least one component that is a true liquid under the conditions of treatment. A slurry, wet sludge, pumpable sediment, emulsion, froth, all are considered liquid for treatment in this class.

MAINSTREAM

The main body of liquid being treated as constrasted with separated constituents. The mainstream may comprise several divided streams, some of which undergo treatment and which are a substantial part of the overall feed but a relatively small stream diverted for a dosing technique in which agents are added in a concentrated amount and the diverted stream is diluted with the main body is not considered to be the mainstream, per se. A recirculated portion of the stream is not considered to be the mainstream.

MEMBRANE

A skinlike thin film which acts as a barrier or container wall; the usual form of a permeable or semipermeable septum. A semipermeable membrane is a skinlike, relatively thin film which serves to define a barrier or container wall to at least one of the constituents of a solution or colloidal suspension and allows at least one other constituent to pass through by a mechanism which may include but goes beyond mere straining and which mechanism is in part due to differences in behavior of the constituents of the solution or suspension with respect to the material of the membrane. The constituents vary in their ability to diffuse through or to wet the membrane.

Membranelike includes mambrane, per se, and material which, while not strictly in a self-supporting skinlike structure, functions in an analogous manner and includes a layer of fine particulate matter or an emulsion as set out in subclass 643.

A process which depends only on the relative size of pores and molecules or ions of a constituent is a filtering or straining process and is classified under separation, subclass 767.

MICRON

A linear measurement equal to one millionth of a meter, one thousandth of a mm, 39 millionths of an inch.

MICRO-ORGANISM

Living plants or animals of a size normally visible only through a microscope and includes bacteria, yeast, fungi, and virus. For purposes of this class, algae are not considered micro-organisms. The scope of this term is coextensive with the organisms of Class 435, Molecular Biology and Microbiology.

MICROFILTER

See FILTER.

MOLECULAR SIEVE

A sorbent with an extremely large volume of pores, each of about molecular size, capable of selectively sorbing gases and other material in molecular form; generally of Zeolite.

OIL

Organic material of slick or slippery feel including long chain hydrocarbons esters of higher fatty acid and derived from petroleum, fats, greases, and oils of animal or vegetable origin.

OLEOPHILIC

Oil attractive or wettable by oil.

OLEOPHOBIC

Oil repelling.

OSMOSIS

Phenomenon in which solvent migrates or is transported across a barrier from a less concentrated solution to a more concentrated solution separated by the barrier tending to equalize the concentrations. The force driving the solvent is dependent on the materials of the liquids and the barrier or septum, and a counter force of greater magnitude will effect reverse migration or reverse osmosis causing solvent to migrate from the more concentrated to the less concentrated solution. A comprehensive treatise on osmosis and reverse osmosis is given in Kirk-Othmer Encyclopedia of Chemical Technology 2nd ed. Vol. 14, pp. 345-355.

OXIDANT

An agent which extracts electrons from a chemical moiety and increases its positive or decreases its negative valence. Often an oxygen or halogen containing material.

PERMEABLE

Property of allowing passage or migration of other material through a barrier or septum of the material so designated. The migration phenomenon is due primarily to the chemical nature of the materials involved and may include molecular weight or size as a factor.

PERMEATE

Material which has passed through a permeable or semipermeable membrane.

pH

The measure of the acidity or basicity (alkalinity) of a liquid. Also determines the sweetness or sourness of a liquid. The original value was the log of the reciprocal of the hydrogen ion concentration.

POLISHING

An ion exchange process in which the ions released to the liquid are only H+ and OH-. A method of achieving very pure water. See CONDUCTIVITY WATER.

PREFILT

Material to be filtered, also known as feed, influent, intake.

RESIDUE

Material retained by membrane, septum, filter, settling tank, etc.

RETENTATE

Material held back by membrane or filter, not allowed to migrate or pass through.

REVERSE OSMOSIS

See OSMOSIS.

SEMIPERMEABLE

Permeable to only some of materials which may be in intimate association as in a solution. Usually applied to membrane, see MEMBRANE.

SLUDGE

Concentrate of settled colloidal suspension with a mushy or mud texture, a gel with up to more than 90 percent usually water) but quite viscous. It may contain indiscriminate solids as grits, fiber, wood chip, and emulsions. While still wet, treatment is proper for this class, but the same material when completely dry may be referred to as sludge. See ACTIVATED SLUDGE.

SORB, SORBING

The attracting by a solid material of a liquid wherein the liquid permeates the body of the solid, either in pores or throughout the material itself or of a finely divided constituent, suspended or dissolved in a liquid, on the surface of or in pores of the material. Examples of the former are methods using sponges, mops, and pads and of the latter are methods using activated charcoal clays and zeolites. In this class, no distinction is made between absorption and adsorption. Processes using sorption for separation are provided for in subclasses 660+. (See Kirk-Othmer Encyclopedia of Chemical Technology 2nd ed. Vol. 1, pp. 44-75 and 421-469.)

SUSPENSION

Liquid carrying throughout its volume in extremely fine subdivision an insoluble substance (solid or another liquid) which will not settle under gravity nor can be filtered without special treatment such as addition of chemical agents. A DISPERSION. See FLOCCULATION, GEL, and MEMBRANE.

SYNTHETIC

A material not found in nature, but man-made from chemical building blocks, with properties resembling naturally occurring materials. It does not include man-made duplicates of natural material or chemical modified natural materials. For example, regenerated cellulose and cellulose acetate are not included nor is zein, but polyester, vinyl, and nylon are included.

TRICKLING FILTER

A particulate bed of designed coarseness through which liquid is gravity fed at a rate to maintain relatively thin films on the particles and enhance air liquid contact to promote aerobic treatment of the liquid. An alternate method may be programmed flooding and draining of the bed. The treatment using such a bed is in subclasses 616+.

ULTRAFILTRATION

Filtration of a solution or colloid, retaining a constituent of macromolecule dimension. See FILTRATION and MEMBRANE.

VAPOR

A normally liquid material in a gaseous state, e.g., steam. Separating or purifying a fluid in the gaseous state is proper for Class 55, Gas Separation, but treating a liquid with gaseous constituents is provided for in subclasses 603+, 640, 664, 707, 718, and 750.

WASTE

A liquid that is to be discarded. The term includes effluent from domestic or industrial sources, e.g, sewage wash water spent processing fluids, etc., and refers to liquid to be treated and liquid which has been treated to allow discharge to the environment.

SUBCLASSES

[List of Patents for class 210 subclass 85]    85WITH ALARM, INDICATOR, REGISTER, RECORDER, SIGNAL OR INSPECTION MEANS:
 This subclass is indented under the class definition.  Apparatus with an alarm indicator, register, recorder or signal, showing a condition of the subject matter of the class; or with means which permit inspection of normally hidden parts of the apparatus or of the fluid inside the apparatus.

SEE OR SEARCH THIS CLASS, SUBCLASS:

138+,for controlled devices including only the driving mechanism of a clock without any indication other than that of a conventional clock.

SEE OR SEARCH CLASS:

73Measuring and Testing,   appropriate subclasses, for pressure, level, temperature, etc., measuring and indicating means, per se, especially subclass 61.41 for methods and means for testing which determines a characteristic of a separated constituent.
116Signals and Indicators,   appropriate subclasses, for mechanical signals and indicators, per se.
118Coating Apparatus,   subclasses 712+ for coating apparatus and a signal or an indicator.
222Dispensing,   subclasses 23+ for dispensers with recorder, register, indicator, signal or exhibitor.
235Registers,   appropriate subclasses, for registers, per se.
340Communications: Electrical,   subclasses 603+ for electrical automatic fluent material responsive indicating systems.
346Recorders,   appropriate subclasses, for recorders, per se.
  
[List of Patents for class 210 subclass 86]    86Material level or thickness responsive:
 This subclass is indented under subclass 85.  Apparatus responsive to a change in the level or thickness of a material being treated within the apparatus.
  
[List of Patents for class 210 subclass 87]    87Responsive to fluid flow:
 This subclass is indented under subclass 85.  Apparatus responsive to flow of fluids.
  
[List of Patents for class 210 subclass 88]    88Meter-controlled cyclic systems:
 This subclass is indented under subclass 87.  Apparatus in which a meter controls an operating cycle of the apparatus.
  
[List of Patents for class 210 subclass 89]    89With time control:
 This subclass is indented under subclass 88.  Apparatus including means operating during or after a predetermined interval of time.
  
[List of Patents for class 210 subclass 90]    90Fluid pressure responsive:
 This subclass is indented under subclass 85.  Apparatus responsive to fluid pressure.
  
[List of Patents for class 210 subclass 91]    91Position or extent of motion:
 This subclass is indented under subclass 85.  Apparatus comprising means which gives information as to the position of a movable or adjustable part of the apparatus.
  
[List of Patents for class 210 subclass 92]    92Test valve:
 This subclass is indented under subclass 85.  Apparatus including a valve which may be opened for test purposes.
  
[List of Patents for class 210 subclass 93]    93In effluent conduit:
 This subclass is indented under subclass 85.  Apparatus comprising a section in a conduit downstream from treating means.
  
[List of Patents for class 210 subclass 94]    94Transparent:
 This subclass is indented under subclass 85.  Apparatus in which the inspection means is a transparent part of a treating means.

SEE OR SEARCH CLASS:

222Dispensing,   subclasses 154+ for dispensers with inspection devices.
  
[List of Patents for class 210 subclass 95]    95Sight glass:
 This subclass is indented under subclass 94.  Apparatus comprising transparent means associated with treatment apparatus through which material being treated can be viewed.

SEE OR SEARCH CLASS:

73Measuring and Testing,   subclasses 323+ for liquid level sight glasses of general application.
  
[List of Patents for class 210 subclass 96.1]    96.1CONSTITUENT MIXTURE VARIATION RESPONSIVE:
 This subclass is indented under the class definition.  Apparatus in which an operating condition of the apparatus is controlled by variations of a constituent quality of a liquid mixture as determined by physical or chemical tests of the liquid mixture.

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662,for composition testing in ion exchange or sorption processes.

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23Chemistry: Physical Processes,   subclass 230 for analytical and analytical control methods there provided for.
137Fluid Handling,   subclasses 3+ for processes of mixing plural fluids of diverse characteristics; and subclasses 88+ for a system involving mixture condition maintaining or sensing.
  
[List of Patents for class 210 subclass 96.2]    96.2With membrane:
 This subclass is indented under subclass 96.1.  Apparatus having a filtering means composed of a thin, enveloping or lining substance, i.e., membrane.

SEE OR SEARCH THIS CLASS, SUBCLASS:

257.1,for a membrane within a storage unit in serially connected distinct treating apparatus.
348+,for apparatus which uses a semipermeable septum which does not provide for continuous streams on both sides of the septum.
433+,for similar apparatus which uses in ordinary filter septum.
500.1,for membrane, per se.
541,for membrane supports, frames, and spaces.
634+,for process of using a septum selective as to composition.

SEE OR SEARCH CLASS:

127Sugar, Starch, and Carbohydrates,   subclass 10 for a sugar solution dialyzer.
204Chemistry: Electrical and Wave Energy,   subclasses 252+ for a similar device using an electric current.
604Surgery,   subclass 6.09 for membrane separation devices used in blood treat
  
[List of Patents for class 210 subclass 97]    97FLOW, FLUID PRESSURE OR MATERIAL LEVEL, RESPONSIVE:
 This subclass is indented under the class definition.  Apparatus having means responsive to variations in flow, material level or fluid pressure to control means to effect an operation or change in an operating condition.

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156+,for a fluid stream or residue operated flume stream type separator.
349,for a filter with pulsation dampening means.
354,for a filter medium or cleaner or agitator moved by fluid.

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162Paper Making and Fiber Liberation,   subclass 258 for paper making apparatus having automatic control of stock consistency, and subclass 259 for automatic control of stock feed to the foraminous forming screen.
204Chemistry: Electrical and Wave Energy,   subclass 662 for an electrical or magnetic apparatus to separate or purify a liquid with a control means responsive to a sensed liquid level.
  
[List of Patents for class 210 subclass 98]    98Fluid current controlled cyclic system:
 This subclass is indented under subclass 97.  Apparatus in which an operating cycle is controlled in response to the liquid flow.

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88+,for a meter controlled cyclic system.
  
[List of Patents for class 210 subclass 99]    99Prefilt deverting to drain by prefilt accumulation:
 This subclass is indented under subclass 97.  Apparatus in which there is means for diverting the initial charge of prefilt to drain, said means being responsive to accumulation of prefilt in a nonseparating receiver.

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130+,for a fluid pressure responsive bypass.
421,for a filter with a manually operated prefilt deflector.

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137Fluid Handling,   subclass 120 for self-controlled branched flow systems having alternate outflows including liquid level sensing means.
  
[List of Patents for class 210 subclass 100]    100Flow cut-off requiring reset:
 This subclass is indented under subclass 97.  Apparatus which causes a flow controller to close, after which a necessary resetting operation must be preformed by an external operator.
  
[List of Patents for class 210 subclass 101]    101Proportionate feed means:
 This subclass is indented under subclass 97.  Apparatus including means to maintain the ratio between plural flows at a predetermined value in response to means sensing a change in fluid condition in at least one of the flow lines.

SEE OR SEARCH THIS CLASS, SUBCLASS:

105,for diverse condition responsive controls one of which controls an auxiliary liquid inlet.
127,for a separator having a float controlled auxiliary fluid inlet.
198+,for separatory means having means to add treating material.

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137Fluid Handling,   subclass 9 for self-proportioning fluid handling processes and subclasses 98+ for self-proportioning apparatus.
222Dispensing,   subclass 57 for dispensing devices which are automatically controlled by the weight, volume or pressure of a second dispensed material, and subclass 130 for plural sources at least one of which is nondispensing.
  
[List of Patents for class 210 subclass 102]    102Programming plural units:
 This subclass is indented under subclass 97.  Apparatus governing the order in which individual separatory units of a plurality of such units are used.
  
[List of Patents for class 210 subclass 103]    103Diverse sensing means:
 This subclass is indented under subclass 97.  Apparatus which includes plural sensing means differing characteristics other than mere size.
  
[List of Patents for class 210 subclass 104]    104Responsive to material level:
 This subclass is indented under subclass 103.  Apparatus responsive to a change in the level of the liquid or solids.
  
[List of Patents for class 210 subclass 105]    105With control for auxiliary liquid inlet:
 This subclass is indented under subclass 103.  Apparatus including the control of introduction of an auxiliary liquid to a treatment chamber.

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101,for separatory apparatus combined with means to feed treating material thereto proportionately to the material being treated.
  
[List of Patents for class 210 subclass 106]    106Filter cleaning:
 This subclass is indented under subclass 97.  Apparatus relating to means to rehabilitate or clean a filter medium.

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407+,for filter means combined with cleaning means.
  
[List of Patents for class 210 subclass 107]    107Rotary movement of filter or mechanical cleaner:
 This subclass is indented under subclass 106.  Apparatus wherein the filter medium or the rehabilitating means is rotated.

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359+,for a movable filter medium.
  
[List of Patents for class 210 subclass 108]    108Backwash or blowback:
 This subclass is indented under subclass 106.  Apparatus comprising backwash or blowback means.

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420+,for a filter provided with a flow controller providing selective direction flow therethrough.
  
[List of Patents for class 210 subclass 109]    109Discharge of treated material:
 This subclass is indented under subclass 97.  Apparatus which controls a treated material discharge outlet.

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137Fluid Handling,   subclasses 395+ for liquid level responsive outlet controls for tanks of general utility, and subclasses 577+ for fluid handling tanks of general utility having adjustable outlets, especially subclass 578 for float supported outlets.
  
[List of Patents for class 210 subclass 110]    110With separator inlet control:
 This subclass is indented under subclass 109.  Apparatus with means controlling an inlet to a separator.

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103+,for control by diverse sensing means.
  
[List of Patents for class 210 subclass 111]    111Responsive to prefilt accumulation or filter clogging:
 This subclass is indented under subclass 109.  Apparatus responsive to liquid to be treated or to an increase in pressure upstream of a filter.

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99,for means diverting prefilt to drain responsive to prefilt accumulation.
130+,for bypass means responsive to pressure.
  
[List of Patents for class 210 subclass 112]    112Heavier constituent:
 This subclass is indented under subclass 109.  Apparatus in which the material is a heavier constituent.
  
[List of Patents for class 210 subclass 113]    113By weight of solids:
 This subclass is indented under subclass 112.  Apparatus responsive to weight of accumulated solids.
  
[List of Patents for class 210 subclass 114]    114By treated liquid accumulation:
 This subclass is indented under subclass 112.  Apparatus responsive to treated liquid accumulation.
  
[List of Patents for class 210 subclass 115]    115With lighter constituent outlet control:
 This subclass is indented under subclass 112.  Apparatus controlling a lighter constituent discharge outlet.

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103+,for apparatus including diverse sensing means.
  
[List of Patents for class 210 subclass 116]    116Permitted by filtrate accumulation:
 This subclass is indented under subclass 109.  Apparatus wherein the discharge outlet is normally closed and permits discharge of filtrate responsive to filtrate accumulation.

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114,for means controlling discharge of a heavier constituent responsive to treated liquid accumulation.
117+,for valve means responsive to change in direction of the flow to prevent backflow.
  
[List of Patents for class 210 subclass 117]    117Check valve controlled:
 This subclass is indented under subclass 109.  Apparatus including flow control means allowing flow in only one direction.

SEE OR SEARCH THIS CLASS, SUBCLASS:

137,for means maintaining stream pressure or flow in separatory apparatus.
  
[List of Patents for class 210 subclass 118]    118Non-closing, e.g., sand valve:
 This subclass is indented under subclass 117.  Apparatus comprising a variable restrictor responsive to flow direction whereby flow increases during backwash.
  
[List of Patents for class 210 subclass 119]    119Float type:
 This subclass is indented under subclass 117.  Apparatus comprising a float operated valve means.

SEE OR SEARCH CLASS:

137Fluid Handling,   subclasses 247.15+ for line condition change responsive flow controllers combined with liquid seal traps, subclasses 409+ for float operated valves, and subclasses 455+ for line condition responsive valves, especially subclasses 511+ for check valves.
  
[List of Patents for class 210 subclass 120]    120Vent control:
 This subclass is indented under subclass 97.  Apparatus comprising means controlling an opening above a liquid level for entrance or exit of a gas.

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130+,for a liquid bypass which may also serve as a vent.
472,for a filter means with vent means.
  
[List of Patents for class 210 subclass 121]    121Float:
 This subclass is indented under subclass 97.  Apparatus in which the responsive means is a float.

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104,for diverse sensing means responsive to material level.
  
[List of Patents for class 210 subclass 122]    122Controls movable separator:
 This subclass is indented under subclass 121.  Apparatus which controls the movement of a separatory medium.
  
[List of Patents for class 210 subclass 123]    123Controls valve:
 This subclass is indented under subclass 121.  Apparatus in which the float controls valve means.
  
[List of Patents for class 210 subclass 124]    124Controls flow between two separators:
 This subclass is indented under subclass 123.  Apparatus in which the valve means is located in the flow stream between two separators.
  
[List of Patents for class 210 subclass 125]    125Separator between float and valve:
 This subclass is indented under subclass 123.  Apparatus in which the float and the valve means are on opposite sides of a separatory means.
  
[List of Patents for class 210 subclass 126]    126Float in separate rehabilitating fluid tank:
 This subclass is indented under subclass 123.  Apparatus in which the float is located in a separate tank or compartment provided for the storage of rehabilitating fluid.
  
[List of Patents for class 210 subclass 127]    127Additional fluid inlet control:
 This subclass is indented under subclass 123.  Apparatus in which the valve means controls admission of a fluid other than liquid being treated.

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101+,for a separator with proportionate feed means for adding treating material.
198+,for a separator with means to add treating material.
  
[List of Patents for class 210 subclass 128]    128Float in receptacle other than that of separator:
 This subclass is indented under subclass 123.  Apparatus in which the float is in a nontreating chamber.

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126,for a float in separate rehabilitating fluid tank.
  
[List of Patents for class 210 subclass 129]    129In flow between inlet and separator:
 This subclass is indented under subclass 128.  Apparatus in which the float is in the flow between a controlled inlet and a separator.
  
[List of Patents for class 210 subclass 130]    130Fluid pressure responsive by-pass:
 This subclass is indented under subclass 97.  Apparatus comprising means responsive to pressure to bypass liquids around treatment means.

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99,for means to divert on initial charge of prefilt to drain.
790,for separating processes involving dividing and recombining the flow.
  
[List of Patents for class 210 subclass 131]    131By movement of separation medium:
 This subclass is indented under subclass 130.  Apparatus in which the responsive means is a separating element or filter medium which provides a bypass by flexing or compression thereof or by movement in its entirety.

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356,for fluid operated means to flex a filter means during operation.
398+,for movable elements within a casing, the movement of which may open a bypass.
738,for processes including pulsation or oscillation essential to the separation or purification.
  
[List of Patents for class 210 subclass 132]    132With additional separation or treating means:
 This subclass is indented under subclass 130.  Apparatus in which the by-pass contains separation or treatment means.

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294+,for diverse distinct separators.
806,for processes including plural separatory steps.
  
[List of Patents for class 210 subclass 133]    133In inlet and outlet closure header:
 This subclass is indented under subclass 130.  Apparatus in which a separator casing is closed by a unitary attached header which header includes at least an inlet and an outlet and the pressure response bypass means therebetween.
  
[List of Patents for class 210 subclass 134]    134Plural elements controlled:
 This subclass is indented under subclass 97.  Apparatus including plural variable flow affecting elements, at least one of which is controlled by the sensing means.

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103+,for apparatus including diverse sensing means controlling an operating phase or phases in a separator.
110,for line condition responsive means controlling discharge of treated material and the inlet to a separator.
115,for line condition responsive means controlling discharge of a heavier constituent and discharge of a lighter constituent.
  
[List of Patents for class 210 subclass 135]    135Including manually controlled element:
 This subclass is indented under subclass 134.  Apparatus including at least one manually operated flow controller.
  
[List of Patents for class 210 subclass 136]    136Check valve:
 This subclass is indented under subclass 97.  Apparatus having means responsive to a change in a flow line condition acting of the face of a valve disc or plug itself to permit flow in one direction only.

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103,for diverse sensing means.
117+,for a check valve controlling discharge of treated material.
120,for a check valve controlled vent.
130+,for a fluid pressure responsive bypass.
416,for valves which form a part of a pump organization.
  
[List of Patents for class 210 subclass 137]    137Maintaining stream pressure or flow:
 This subclass is indented under subclass 97.  Apparatus to regulate pressure of or rate of flow of a liquid.

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111,for means discharging treated material responsive to filter clogging.
114,for means discharging the heavier constituent responsive to treated liquid accumulation.
116,for discharge of treated material responsive to filtrate accumulation.
130,for a fluid pressure responsive bypass.
  
[List of Patents for class 210 subclass 138]    138WITH TIME CONTROL:
 This subclass is indented under the class definition.  Apparatus in which the time at which an element of an treating means is actuated, or the length of time taken to perform an operation thereof is controlled.

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68Textiles: Fluid Treating Apparatus,   subclasses 12 and 23+ for treating machines having centrifugal extractor features and time-controlled means associated therewith.
  
[List of Patents for class 210 subclass 139]    139Of additional fluid:
 This subclass is indented under subclass 138.  Apparatus which introduces to the treating means a fluid in addition to that being treated.
  
[List of Patents for class 210 subclass 140]    140Preparation for treating operation:
 This subclass is indented under subclass 139.  Apparatus in which the additional fluid serves to prepare the treating means for a treating operation.
  
[List of Patents for class 210 subclass 141]    141WITH PROGRAM ACTUATOR:
 This subclass is indented under the class definition.  Apparatus in which an actuating means provides either a continuously repetitive operation of a treating device or a single operation terminating in a position to restart an additional cycle, which cycle is more complex than a mere starting or stopping of a single treating device.
  
[List of Patents for class 210 subclass 142]    142Plural treating units or sections sequentially controlled:
 This subclass is indented under subclass 141.  Apparatus in which there is a plurality of treating units or sections which are controlled in sequence.
  
[List of Patents for class 210 subclass 143]    143AUTOMATIC CONTROL:
 This subclass is indented under the class definition.  Apparatus having means to sense some condition of a treatment operation and operate a control device.

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86,for a material level responsive indicator.
87,for a fluid flow responsive indicator.
90,for a fluid pressure responsive indicator.
96.1+,for control responsive to constituent mixture variation.
97+,for control by fluid flow, fluid pressure or material level responsive means.

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137Fluid Handling,   subclasses 87.01+ for self proportioning or correlated fluid handling systems of general utility.
  
[List of Patents for class 210 subclass 144]    144Responsive to vibration or unbalance:
 This subclass is indented under subclass 143.  Apparatus responsive to vibration or unbalance of a movable part of treating means.

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363+,for a centrifugal extractor with rotation stabilizer.

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74Machine Element or Mechanism,   subclasses 572+ for flywheels and rotors with balancing or vibration dampening means defining no specific feature of separator construction.
192Clutches and Power-Stop Control,   subclasses 116+ for power-stop control of more general utility.
318Electricity: Motive Power Systems,   subclasses 445+ for a motor control systems, particularly subclass 460 for vibration responsive control.
  
[List of Patents for class 210 subclass 145]    145Responsive to rotation:
 This subclass is indented under subclass 143.  Apparatus responsive to a condition of rotation of a part of the treating means.

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144,for vibration or unbalance responsive control.

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192Clutches and Power-Stop Control,   subclasses 103+ for a speed responsive clutch for a centrifugal extractor.
  
[List of Patents for class 210 subclass 146]    146Controlled cover latch:
 This subclass is indented under subclass 145.  Apparatus in which there is a treatment casing provided with a closure and a latch controlled by the rotation responsive means.

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192Clutches and Power-Stop Control,   subclass 136 for an automatic cover latch control for a centrifugal extractor.
  
[List of Patents for class 210 subclass 147]    147Controlled discharge means:
 This subclass is indented under subclass 145.  Apparatus which controls a discharge means for a constituent of the class subject matter.

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109+,for control of discharge responsive to fluid flow, pressure or material level.
  
[List of Patents for class 210 subclass 148]    148Container movement operated:
 This subclass is indented under subclass 143.  Apparatus operated accidentally or unintentionally by movement of a container used in a treating operation.

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235,for actuation of a flow controller on assembly of parts.

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137Fluid Handling,   subclass 43 for a vent valve opened or closed by the tipping of a container.
  
[List of Patents for class 210 subclass 149]    149Thermal:
 This subclass is indented under subclass 143.  Apparatus having means responsive to a thermal condition.
  
[List of Patents for class 210 subclass 150]    150WITH GAS-LIQUID SURFACE CONTACT MEANS:
 This subclass is indented under the class definition.  Apparatus consisting of solid contact means to increase the surface area of a liquid in a gas-liquid contact device whereby the contact is enhanced.

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261Gas and Liquid Contact Apparatus,   appropriate subclasses for gas and liquid contact apparatus there provided for.
  
[List of Patents for class 210 subclass 151]    151With separator:
 This subclass is indented under subclass 150.  Apparatus combined with a separator.
  
[List of Patents for class 210 subclass 153]    153STRUCTURAL INSTALLATION:
 This subclass is indented under the class definition.  Apparatus combined with (1) means performing an operation external to the subject matter of this class, (2) combined with a static construction installation, (3) specifically related to a particular geographic feature wherein there is included only enough structure foreign to this class (210) to associate it with the apparatus.

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241+,for a separator combined with a movable support.
244+,for a draining type separator comprising a portable receptacle with a hood or closure.
419,for a filter attached to or within a portable prefilt receiver having a flow controller for the material being treated.
464+,a portable receptacle draining type filter.
473+,for a filter resting on a supporting receiver.

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4Baths, Closets, Sinks, and Spittoons,   appropriate subclasses particularly subclass 652 for strainers combined with sink structure and subclasses 286+ for strainers and stoppers peculiar to that art.
37Excavating,   subclasses 318+ for a dredger combined with a screen separator.
68Textiles: Fluid Treating Apparatus,   subclasses 19+ for a laundry machine combined with a fluid extractor, and subclasses 235+ for a separator combined with a washing machine drain.
99Foods and Beverages: Apparatus,   subclass 408 for a deep fat fryer type cooker having crumb or sediment segregation means.
122Liquid Heaters and Vaporizers,   subclass 431 for a filter in a boiler.
137Fluid Handling,   subclass 140 for a siphon combined with a separatory means, and subclasses 343+ for a structural installation of a fluid handling apparatus.
159Concentrating Evaporators,   subclass 42 for a concentrating evaporator combined with a strainer or skimmer.
222Dispensing,   subclasses 189.06+ for a dispenser with a strainer, and subclass 565 for a sifting dispenser.
435Chemistry: Molecular Biology and Microbiology,   subclasses 289.1+ for fermentation apparatus including separating means, particularly subclass 295.3 for a bioreactor with the combination of a draft tube and a semipermeable membrane or filter, subclasses 297.1+ for a bioreactor including a semipermeable membrane or filter, and subclass 308.1 for an apparatus for separating a microorganism from culture media.
  
[List of Patents for class 210 subclass 154]    154Flume stream type:
 This subclass is indented under subclass 153.  Apparatus comprising separating means placed in or at the entrance of an open channel confining a flowing stream to prevent solids, such as debris or fish, from passing downstream.

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131,for a movable animal stop in a sewer comprising a fluid pressure responsive bypass.
173+,for flume stream type separators with comminuting means.

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405Hydraulic and Earth Engineering,   subclasses 118+ for specific open channel construction or flow control features other than that forming the inlet and outlet to a separator.
  
[List of Patents for class 210 subclass 155]    155Plural or diverse screens:
 This subclass is indented under subclass 154.  Apparatus including plural, spaced, straining elements or straining elements of different shapes or kinds.

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294+,for diverse distinct separators of general utility.
322+,for plural distinct separators of general utility.
  
[List of Patents for class 210 subclass 156]    156Fluid stream or residue operated:
 This subclass is indented under subclass 154.  Apparatus moved by the flowing stream or by a collection of residue on the separator medium.

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354+,for filter structure similarly operated.
  
[List of Patents for class 210 subclass 157]    157Revolving cylindrical strainer:
 This subclass is indented under subclass 156.  Apparatus in which the separating medium is a cylindrical filter rotating about a central axis.
  
[List of Patents for class 210 subclass 158]    158With cleaner for movable strainer:
 This subclass is indented under subclass 154.  Apparatus including means for cleaning the filter which is movable.
  
[List of Patents for class 210 subclass 159]    159With cleaner and means to remove residue therefrom:
 This subclass is indented under subclass 154.  Apparatus including a filter cleaner which is a movable solid means, as a brush, with means to remove residue therefrom.
  
[List of Patents for class 210 subclass 160]    160Endless belt strainer:
 This subclass is indented under subclass 154.  Apparatus in which the separating means is a movable endless foraminous belt.
  
[List of Patents for class 210 subclass 161]    161Revolving strainer:
 This subclass is indented under subclass 154.  Apparatus in which the separating means is a strainer mounted to revolve in the fluid stream.
  
[List of Patents for class 210 subclass 162]    162Fixed strainer:
 This subclass is indented under subclass 154.  Apparatus in which the separating means is a strainer stationarily mounted in the fluid stream.
  
[List of Patents for class 210 subclass 163]    163Grated inlet surface drain:
 This subclass is indented under subclass 153.  Structures including a strainer in outlet means which provide drain means for a surface, as a floor.

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116,for a grated surface inlet drain including means responsive to filtrate accumulation permitting discharge of treated material.
119,for a grated surface drains having back-flow preventing means.
247,for a strainer with a filtrate deflector.
459,for a pipe or plate attached filter.

SEE OR SEARCH CLASS:

4Baths, Closets, Sinks, and Spittoons,   appropriate subclasses, particularly subclasses 268+ , 275+, 286+, 596+, 640+, and 650+ for plumbing apparatus including drains with grated inlets.
52Static Structures (e.g., Buildings),   subclass 12 for cover with an eave or valley gutter with a separator.
285Pipe Joints or Couplings,   subclass 42 for flashed pipe-to-plate joint.
404Road Structure, Process, or Apparatus,   subclasses 2+ for roadway drain or gutter structure.
  
[List of Patents for class 210 subclass 164]    164Flat grating at surface level:
 This subclass is indented under subclass 163.  Structures where the upper face of the strainer is flat and is level with its associated surface.
  
[List of Patents for class 210 subclass 165]    165With subsurface weep means:
 This subclass is indented under subclass 164.  Structures which include means to dispose of subsurface see page e.g., weep holes.

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285Pipe Joints or Couplings,   subclass 14 for a pipe joint including leakage or drip disposal means comprising a weep hole.
  
[List of Patents for class 210 subclass 166]    166Concentric guard ring or rib:
 This subclass is indented under subclass 163.  Apparatus comprising a concentric ring or rib between the strainer and its associated surface wherein the ring or rib projects above the plane of the surface.
  
[List of Patents for class 210 subclass 167.01]    167.01Closed circulating system:
 This subclass is indented under subclass 153.  Apparatus comprising a group of devices, including liquid purification or separation means, through which the liquid being purified or separated is continuously returned and reused.

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194+,for liquid purification or separation apparatus including recirculation means.

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68Textiles: Fluid Treating Apparatus,   subclass 18 for textile fluid treating apparatus including recirculation means and liquid purification or separation means for the used solvent.
118Coating Apparatus,   subclasses 600+ for coating apparatus with means for treatment of the coating material involving recirculation and liquid purification or separation.
123Internal-Combustion Engines,   subclass 41.55 for internal- combustion engine cooling system combined with liquid purification or separation means and subclass 196 for internal- combustion engine lubricator means combined with liquid purification or separation means.
134Cleaning and Liquid Contact With Solids,   subclasses 10+ and 109+ for cleaning and liquid contact with solids processes and apparatus including means for purifying or separating the cleaning or contact liquid.
  
[List of Patents for class 210 subclass 167.02]    167.02For lubrication system:
 This subclass is indented under subclass 167.01.  Apparatus in which the liquid purification or separation means is adapted for use in a closed circulating system that provides lubricant to moving parts of a machine.

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416.5,for a filter, with a pump, gas pressure, or suction source, adapted for use in a lubricating or oil treating system.

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123Internal-Combustion Engines,   subclass 196 for internal- combustion engine lubricator means combined with liquid purification or separation means.
184Lubrication,   subclass 1.5 for automobile crank and gear case service apparatus including liquid purification of separation means and subclasses 6.24+ for lubrication systems combined with liquid purification or separation means.
  
[List of Patents for class 210 subclass 167.03]    167.03Having magnetic treating means:
 This subclass is indented under subclass 167.02.  Apparatus having means that attract iron and certain other materials because of a surrounding field of force produced by motion of its atomic electrons and alignment of its atoms.
(1) Note. The magnetic treating means generally is used to cause separation of iron-containing material from the lubricant. However, the magnetic treating means may subject the lubricant to a process that otherwise improves or alters the lubricant (e.g., mixing, etc.).

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167.29,for liquid purification or separation apparatus comprising a closed circulating system having magnetic treating means not for a lubrication system.
222+,for liquid purification or separation apparatus including magnetic treating means not in a closed circulating system.
  
[List of Patents for class 210 subclass 167.04]    167.04Plural separators:
 This subclass is indented under subclass 167.02.  Apparatus that has two or more means for liquid purification or separation.
  
[List of Patents for class 210 subclass 167.05]    167.05Having bypass line:
 This subclass is indented under subclass 167.04.  Apparatus that has means to conduct the lubricant around a device in the closed circulating system.
  
[List of Patents for class 210 subclass 167.06]    167.06With heating or cooling means:
 This subclass is indented under subclass 167.02.  Apparatus that has means to raise or lower the temperature of the lubricant.

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167.32,for liquid purification or separation apparatus comprising a closed circulating system with heating or cooling means not for a lubrication system.
175+,for liquid purification or separation apparatus with a heater or a heat exchanger not in a closed circulating system.
  
[List of Patents for class 210 subclass 167.07]    167.07Evaporator:
 This subclass is indented under subclass 167.06.  Apparatus in which the means to raise the temperature of the lubricant vaporizes a component to be separated.
  
[List of Patents for class 210 subclass 167.08]    167.08Separator for transmission system:
 This subclass is indented under subclass 167.02.  Apparatus in which the liquid purification or separation means is adapted for use in a closed circulating system that comprises an assembly of parts by which power is transmitted from an engine to a drive axle.

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180Motor Vehicles,   subclasses 337+ for motor vehicle transmission mechanisms.
  
[List of Patents for class 210 subclass 167.09]    167.09With separator cleaning means:
 This subclass is indented under subclass 167.02.  Apparatus in which means are provided to remove the separated component from the liquid purification or separation means.
  
[List of Patents for class 210 subclass 167.1]    167.1For swimming pool or spa (e.g., skimmer, etc.):
 This subclass is indented under subclass 167.01.  Apparatus in which the liquid purification or separation means is adapted for use with a tank, made of concrete, plastic, or other materials, for holding water that is open at the top for a user to enter, for swimming, relaxation, or recreation (e.g., swimming pool, spa, hot tub, etc.).

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416.2,for a filter, with a pump, gas pressure, or suction source, adapted for use with a swimming pool.
470,for a filter with a handle.

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4Baths, Closets, Sinks, and Spittoons,   subclasses 488+ for pools for swimming, relaxation, or recreation.
  
[List of Patents for class 210 subclass 167.11]    167.11With means to add treating material:
 This subclass is indented under subclass 167.1.  Apparatus in which the liquid purification or separation means is combined with means to supply a substance to the water being purified or separated that subjects the water to a chemical or physical process that improves or alters the water.

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167.3,for liquid purification or separation apparatus comprising a closed circulating system with means to add a treating material not for a swimming pool or spa.
198.1+,for liquid purification or separation apparatus with means to add a treating material not in a closed circulating system.

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422Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,   subclasses 255+ for physical type apparatus having means separating or dissolving a material constituent, particularly subclasses 261+ for liquid-solid contact means and particularly subclass 265 for buoyant holders.
  
[List of Patents for class 210 subclass 167.12]    167.12Separator external to swimming pool or spa:
 This subclass is indented under subclass 167.1.  Apparatus in which the liquid purification or separation means is located outside of the swimming pool or spa.
(1) Note. The liquid purification or separation means may be attached to the exterior of the swimming pool or spa or may be connected to the swimming pool or spa by a system of pipes.
  
[List of Patents for class 210 subclass 167.13]    167.13Particulate solid filter:
 This subclass is indented under subclass 167.12.  Apparatus in which the liquid purification or separation means comprises a plurality of small, distinct, separate, nonfilamentous solids in which a component of the water is entrapped and retained while permitting the water to pass through (e.g., sand filter, etc.).
  
[List of Patents for class 210 subclass 167.14]    167.14With separator cleaning means (e.g., backwash means, etc.):
 This subclass is indented under subclass 167.12.  Apparatus in which means are provided to remove the separated component from the liquid purification or separation means.
  
[List of Patents for class 210 subclass 167.15]    167.15Separator for use on swimming pool or spa bottom and separator for use at water surface:
 This subclass is indented under subclass 167.1.  Apparatus that has two or more means for liquid purification or separation in which one means is located on a surface that is lowest in the swimming pool or spa during operation and another means is located at a surface of the water that is highest in the swimming pool or spa during operation.
  
[List of Patents for class 210 subclass 167.16]    167.16Separator for use on swimming pool or spa bottom:
 This subclass is indented under subclass 167.1.  Apparatus that has means for liquid purification or separation located on a surface that is lowest in the swimming pool or spa during operation.
  
[List of Patents for class 210 subclass 167.17]    167.17Debris collecting bag:
 This subclass is indented under subclass 167.16.  Apparatus in which the liquid purification or separation means comprises a usually flexible container that may be closed that is used to gather the component that is separated from the water.
  
[List of Patents for class 210 subclass 167.18]    167.18Skimmer arm at skimmer opening at water surface:
 This subclass is indented under subclass 167.1.  Apparatus in which the liquid purification or separation means comprises a deflecting device that is positioned at a surface of the water that is highest at an opening of a weir in a wall of the swimming pool or spa and that diverts a portion of the water and debris into the opening.
  
[List of Patents for class 210 subclass 167.19]    167.19Mesh or screen filter at or near water surface:
 This subclass is indented under subclass 167.1.  Apparatus in which the liquid purification or separation means comprises a material with an open network of interlacing threads or wires in which a component of the water is entrapped and retained while permitting the water to pass through and is located at or near a surface of the water that is highest in the swimming pool or spa.
  
[List of Patents for class 210 subclass 167.2]    167.2Having floating means:
 This subclass is indented under subclass 167.19.  Apparatus having means to support buoyantly the mesh or screen filter at or near the water surface in the swimming pool or spa.
  
[List of Patents for class 210 subclass 167.21]    167.21For aquarium:
 This subclass is indented under subclass 167.01.  Apparatus in which the liquid purification or separation means is adapted for use with a water-filled container in which aquatic animals are kept, with the container having one or more transparent portions so that the aquatic animals therein can be observed from the exterior.

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416.2,for a filter, with a pump, gas pressure, or suction source, adapted for use in an aquarium.

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119Animal Husbandry,   subclasses 259+ for specific aquarium structure in combination with liquid purification or separation means.
  
[List of Patents for class 210 subclass 167.22]    167.22Separator using living organism:
 This subclass is indented under subclass 167.21.  Apparatus in which the liquid purification or separation means includes an agent that has the ability to reproduce itself.
(1) Note. For purposes of this subclass, living organism includes animals, plants, and microorganisms (e.g., bacteria, fungus, algae, etc.), but not enzymes. The organism may reproduce sexually, asexually, or by mechanical division (caused by external agents) and regeneration (e.g., layering or cloning, etc.).
  
[List of Patents for class 210 subclass 167.23]    167.23Separator or part thereof associated with bottom of aquarium (e.g., means positioned under gravel, etc.):
 This subclass is indented under subclass 167.21.  Apparatus in which the liquid purification or separation means or a portion thereof (e.g., an inlet or an outlet, etc.) is located at or near a surface that is lowest in the aquarium (e.g., means positioned under gravel, etc.).
  
[List of Patents for class 210 subclass 167.24]    167.24Having solid sorbent:
 This subclass is indented under subclass 167.23.  Apparatus having a solid sorbent that is used to retain on its internal or external surfaces a component of the water passing in contact therewith.
(1) Note. A solid sorbent is a solid material that separates one or more components from a fluid mixture containing such components in a "quasi-chemical" manner. The action in most instances is that of selective retention (i.e., the sorbent removes only that part of the fluid mixture for which it has the greatest affinity). The retained component cannot be removed by shaking, brushing, or similar mechanical action, but can generally be removed by heating, pressure reduction, or use of a stripping or denuding fluid. A filter has no particular "chemical" affinity for a component of a fluid mixture. The separation in the case of a filter depends on a mechanical entrapment of solid particles because of their relatively large size compared with the interstices or spaces between individual elements of the filter. The retained particles can be removed by brushing, wiping, shaking, or similar mechanical action.
  
[List of Patents for class 210 subclass 167.25]    167.25Particulate filter or particulate sorbent:
 This subclass is indented under subclass 167.21.  Apparatus in which the liquid purification or separation means comprises a plurality of small, distinct, separate, nonfilamentous solids in which a component of the water is entrapped and retained while permitting the water to pass through or apparatus having a solid sorbent that is used to retain on its internal or external surfaces a component of the water passing in contact therewith.
(1) Note. A solid sorbent is a solid material that separates one or more components from a fluid mixture containing such components in a "quasi-chemical" manner. The action in most instances is that of selective retention (i.e., the sorbent removes only that part of the fluid mixture for which it has the greatest affinity). The retained component cannot be removed by shaking, brushing, or similar mechanical action, but can generally be removed by heating, pressure reduction, or use of a stripping or denuding fluid. A filter has no particular "chemical" affinity for a component of a fluid mixture. The separation in the case of a filter depends on a mechanical entrapment of solid particles because of their relatively large size compared with the interstice or spaces between individual elements of the filter. The retained particles can be removed by brushing, wiping, shaking, or similar mechanical action.
  
[List of Patents for class 210 subclass 167.26]    167.26Separator with aerator:
 This subclass is indented under subclass 167.21.  Apparatus in which the liquid purification or separation means is combined with means to supply the water with a gas (e.g., oxygen, air, etc.).
  
[List of Patents for class 210 subclass 167.27]    167.27Separator mounted on top edge of aquarium wall:
 This subclass is indented under subclass 167.21.  Apparatus in which the liquid purification or separation means is located on an upper rim of the aquarium.
  
[List of Patents for class 210 subclass 167.28]    167.28For cooking oil system:
 This subclass is indented under subclass 167.01.  Apparatus in which the liquid purification or separation means is adapted for use with a cooking apparatus in which food articles or materials are supported or manipulated for heat treating by contact with a body of heated oil (e.g., deep fat fryer, etc.).

SEE OR SEARCH CLASS:

99Foods and Beverages: Apparatus,   subclass 408 for a deep fat fryer type cooker with crumb or sediment segregation means.
  
[List of Patents for class 210 subclass 167.29]    167.29Having magnetic treating means:
 This subclass is indented under subclass 167.01.  Apparatus having means that attract iron and certain other materials because of a surrounding field of force produced by the motion of its atomic electrons and the alignment of its atoms.
(1) Note. The magnetic treating means generally is used to cause separation of iron-containing material from the liquid. However, the magnetic treating means may subject the liquid to a process that otherwise improves or alters the liquid (e.g., mixing, etc.).

SEE OR SEARCH THIS CLASS, SUBCLASS:

167.03,for liquid purification or separation apparatus comprising a closed circulating system having magnetic treating means for a lubrication system.
222+,for liquid purification or separation apparatus including magnetic treating means not in a closed circulating system.
  
[List of Patents for class 210 subclass 167.3]    167.3With means to add treating material:
 This subclass is indented under subclass 167.01.  Apparatus in which the liquid purification or separation means is combined with means to supply a substance to the liquid being purified or separated that subjects the liquid to a chemical or physical process that improves or alters the liquid.

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167.11,for liquid purification or separation apparatus comprising a closed circulating system with means to add a treating material for a swimming pool or spa.
198.1+,for liquid purification or separation apparatus with means to add a treating material not in a closed circulating system.
  
[List of Patents for class 210 subclass 167.31]    167.31Plural separators:
 This subclass is indented under subclass 167.01.  Apparatus that has two or more means for liquid purification or separation.
  
[List of Patents for class 210 subclass 167.32]    167.32With heating or cooling means:
 This subclass is indented under subclass 167.01.  Apparatus that has means to raise or lower the temperature of the liquid.

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167.06,for liquid purification or separation apparatus comprising a closed circulating system with heating or cooling means for a lubrication system.
175+,for liquid purification or separation apparatus with a heater or a heat exchanger not in a closed circulating system.
  
[List of Patents for class 210 subclass 170.01]    170.01Geographic:
 This subclass is indented under subclass 153.  Apparatus in which liquid purification or separation means are part of a system installed in the ground or related to a particular feature of the earth s surface (e.g., a body of water, etc.).
(1) Note. Included in this subclass is in situ purging of flowing or still liquid (e.g., drainage ditch, septic system, pond, etc.) in a structural installation in which the liquid purification or separation means is (a) part of a system installed on natural or modified terrain to convey rain, snowmelt, a river, sewage, well water or oil, etc. or (b) related to a particular nonland geographic feature, such as a lake, ocean, sea, etc.

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154+,for a flume stream type separator.

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137Fluid Handling,   subclass 236.1 for a distribution system involving a geographic feature.
405Hydraulic and Earth Engineering,   subclasses 36+ for drainage devices for collecting and removing surplus water from soil and subclasses 52+ for fluid control, treatment, or containment.
  
[List of Patents for class 210 subclass 170.02]    170.02For fishpond:
 This subclass is indented under subclass 170.01.  Apparatus in which the liquid purification or separation means is adapted for use with a small, still body of clear water stocked with fish.

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119Animal Husbandry,   subclasses 226+ for a fish enclosure of the recirculating type with treatment means and subclasses 228+ for a fish enclosure of the nonrecirculating type with treatment means.
  
[List of Patents for class 210 subclass 170.03]    170.03For stormwater treatment (e.g., rainwater runoff, stormsewer treatment, etc.):
 This subclass is indented under subclass 170.01.  Apparatus in which the liquid purification or separation means is adapted for use to subject fallen precipitation to a chemical or physical process that improves or alters the fallen precipitation (e.g., rainwater runoff, stormsewer treatment, etc.).

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163+,for a grated inlet surface drain.

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52Static Structures (e.g., Buildings),   subclass 12 for a roof with a surface water receiver at an eave with a separator.
404Road Structure, Process, or Apparatus,   subclasses 2 through 5for roadway drain or gutter structure.
  
[List of Patents for class 210 subclass 170.04]    170.04For excavating means:
 This subclass is indented under subclass 170.01.  Apparatus in which the liquid purification or separation means is adapted for use with an apparatus that digs, moves, and handles material either on the earth s surface or beneath a body of water.

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37Excavating,   for excavating apparatus.
  
[List of Patents for class 210 subclass 170.05]    170.05Floating means:
 This subclass is indented under subclass 170.01.  Apparatus in which the liquid purification or separation means is buoyed on or in the liquid.
  
[List of Patents for class 210 subclass 170.06]    170.06Separator with aerator:
 This subclass is indented under subclass 170.01.  Apparatus in which the liquid purification or separation means is combined with means to supply the liquid with a gas (e.g., oxygen, air, etc.).
  
[List of Patents for class 210 subclass 170.07]    170.07Groundwater:
 This subclass is indented under subclass 170.01.  Apparatus in which the liquid purification or separation means purifies or separates water within the earth s surface.

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166Wells,   for well apparatus.
405Hydraulic and Earth Engineering,   subclasses 128.1+ for soil remediation.
  
[List of Patents for class 210 subclass 170.08]    170.08Septic system including drain field or leach field or waste liquid treatment system:
 This subclass is indented under subclass 170.01.  Apparatus in which the liquid purification or separation means comprises a tank in which a continuous flow of waste material is decomposed by bacteria and from which liquids overflow through an outlet of the tank into a disposal field where they can leach into the soil or comprises a group of devices including liquid purification or separation means that purify or separate the waste liquid.
(1) Note. While septic tanks are normally found to be underground, the term septic tank is not considered to be a geographic feature.

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532.2,for a septic tank not associated with a geographic feature.
  
[List of Patents for class 210 subclass 170.09]    170.09Body of freshwater (e.g., pond, lake, reservoir, etc.):
 This subclass is indented under subclass 170.01.  Apparatus in which the particular feature of the earth s surface that the liquid purification or separation means is related to is a bounded aggregate of still water that is not salty (e.g., pond, lake, reservoir, etc.).
  
[List of Patents for class 210 subclass 170.1]    170.1Surface flowing freshwater (e.g., stream, river, ditch, canal, etc.):
 This subclass is indented under subclass 170.01.  Apparatus in which the particular feature of the earth s surface that the liquid purification or separation means is related to is a bounded aggregate of nonsalty, running water flowing on the earth s surface (e.g., stream, river, ditch, canal, etc.).

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154+,for a flume stream type separator.
  
[List of Patents for class 210 subclass 170.11]    170.11Body of saltwater (e.g., sea, ocean, etc.):
 This subclass is indented under subclass 170.01.  Apparatus in which the particular feature of the earth s surface that the liquid purification or separation means is related to is an aggregate of salt water covering most of the earth s surface (e.g., sea, ocean, etc.).
  
[List of Patents for class 210 subclass 171]    171Machinery:
 This subclass is indented under subclass 153.  Apparatus including means having moving parts.

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167.02through 167.09, for a closed circulating system for a lubrication system.

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68Textiles: Fluid Treating Apparatus,   subclass 208 for fluid textile treating means having a drain and strainer means associated therewith.
118Coating Apparatus,   subclass 610 for reconditioning by separation of coating materials.
134Cleaning and Liquid Contact With Solids,   subclass 104 for cleaning apparatus having material collectors (e.g., strainers) for escaping cleaning liquid.
  
[List of Patents for class 210 subclass 172.1]    172.1Separator ancillary to storage tank:
 This subclass is indented under subclass 153.  Apparatus in which the liquid purification or separation means is auxiliary to a supply container.
  
[List of Patents for class 210 subclass 172.2]    172.2Submerged separator:
 This subclass is indented under subclass 172.1.  Apparatus in which the liquid purification or separation means is covered with liquid.
  
[List of Patents for class 210 subclass 172.3]    172.3On pump suction intake:
 This subclass is indented under subclass 172.2.  Apparatus in which the liquid purification or separation means is located on an inlet to a pump.
  
[List of Patents for class 210 subclass 172.4]    172.4Filter supported by frame (e.g., bag shaped filter in fuel tank for engine, etc.):
 This subclass is indented under subclass 172.3.  Apparatus in which the liquid purification or separation means comprises a medium, in which a component of the liquid is entrapped and retained while permitting the liquid to pass through, that is held up by a skeletal structure (e.g., bag shaped filter in fuel tank for engine, etc.).
  
[List of Patents for class 210 subclass 172.5]    172.5Having tethering means:
 This subclass is indented under subclass 172.2.  Apparatus in which the liquid purification or separation means is fastened to a part of the supply container by something (e.g., a rope or chain, etc.) with a set radius that allows the liquid purification or separation means to move about.
  
[List of Patents for class 210 subclass 172.6]    172.6In tank inlet:
 This subclass is indented under subclass 172.1.  Apparatus in which the liquid purification or separation means is located at the opening to the supply container.
  
[List of Patents for class 210 subclass 173]    173COMMINUTING:
 This subclass is indented under the class definition.  Apparatus comprising unitary separators and means to comminute solids.

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154+,for a flume stream type separator, per se.
359+,for a movable filter or separator which may break up "flocs" or residue incidental to agitation or material handling.
407,for a filter having means for agitation of the liquid.
769,for related processes.

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241Solid Material Comminution or Disintegration,   and see the reference to Class 210 in section 8 of the class definition.
  
[List of Patents for class 210 subclass 174]    174Cylindrical strainer:
 This subclass is indented under subclass 173.  Apparatus in which the separating medium comprises a cylindrical filter medium.

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161,for a revolvable flume screen strainer, per se.
402+,for a movable drum type filter.
  
[List of Patents for class 210 subclass 175]    175WITH HEATER OR HEAT EXCHANGER:
 This subclass is indented under the class definition.  Apparatus having heat exchanging means comprising an imperforate heat transfer member, radiant heater or heat generator.

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167.06,for liquid purification or separation apparatus comprising a closed circulating system for a lubrication system with heating or cooling means.
167.32,for liquid purification or separation apparatus comprising a closed circulating system with heating or cooling means.
768+,for separating processes with treatment of separated solids, and subclasses 774+ for separating processes involving treatment by heating or cooling.

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62Refrigeration,   for refrigeration means or steps combined with fluid cooling or gas liquefaction or solidification. For particular subclasses in Class 62 involving refrigeration and fluid separation, see the reference to Class 62 in the class definition of this class (210).
96Gas Separation: Apparatus,   appropriate subclasses for gas separation apparatus combined with heating or cooling means.
122Liquid Heaters and Vaporizers,   subclasses 379+ for processes and apparatus for cleaning liquid heaters or vaporizers or for purifying the water while the boiler is in operation.
126Stoves and Furnaces,   subclass 343.5 for melting furnaces which may include liquid separating means.
159Concentrating Evaporators,   subclass 42 for strainers or skimmers specialized for that class.
165Heat Exchange,   subclass 119 for a heat exchange with an ancillary filter.
202Distillation: Apparatus,   subclass 178 for combined distilland preheater and strainer, and subclasses 202+ for still with condensate treating means.
266Metallurgical Apparatus,   subclasses 277+ for apparatus for separating molten metal for undesired constituents.
  
[List of Patents for class 210 subclass 176]    176Thermal diffusion:
 This subclass is indented under subclass 175.  Apparatus which separate a liquid mixture into two or more dissimilar fractions by subjecting a thin film of liquid mixture to a temperature gradient.

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775,for related processes.
  
[List of Patents for class 210 subclass 177]    177With treating fluid addition:
 This subclass is indented under subclass 175.  Apparatus having means for adding a treating fluid.
  
[List of Patents for class 210 subclass 178]    178With mechanical agitator or movable separator:
 This subclass is indented under subclass 177.  Apparatus in which the separator is provided with a mechanical agitator or in which the separating medium is movable.
  
[List of Patents for class 210 subclass 179]    179With mechanical agitator or movable separator:
 This subclass is indented under subclass 175.  Apparatus provided with mechanical agitating means or with means for moving a separator.

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178,for similar structure with addition of treating fluid.
  
[List of Patents for class 210 subclass 180]    180Vapor or gas removal:
 This subclass is indented under subclass 175.  Apparatus provided with means to remove vapor or gas.

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472,for a vented filter.
  
[List of Patents for class 210 subclass 181]    181Flow line connected in series with distinct separator:
 This subclass is indented under subclass 175.  Apparatus in which a heater or heat exchanger is connected in series by a flow line for the liquid under treatment.

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252+,for other serially connected distinct treating or storage units.
  
[List of Patents for class 210 subclass 182]    182Diverse separators:
 This subclass is indented under subclass 175.  Apparatus in which the separators are of different kinds.

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294+,for other diverse distinct separators.
  
[List of Patents for class 210 subclass 183]    183Common casing coaxial with heater:
 This subclass is indented under subclass 182.  Apparatus wherein the heat exchanger is coaxial with the casing enclosing the diverse separators.
  
[List of Patents for class 210 subclass 184]    184For filter:
 This subclass is indented under subclass 175.  Apparatus wherein the separator is a filter.
  
[List of Patents for class 210 subclass 185]    185Imbedded or between filter media:
 This subclass is indented under subclass 184.  Apparatus in which the heat exchanger is embedded in the filter medium or is sandwiched between filter media.
  
[List of Patents for class 210 subclass 186]    186External of casing:
 This subclass is indented under subclass 184.  Apparatus wherein the heat exchanger is external of the means confining the liquid undergoing treatment.
  
[List of Patents for class 210 subclass 187]    187Within gravitational separator:
 This subclass is indented under subclass 175.  Apparatus in which the heat exchanger is within a liquid holding container of a gravitational separator.
  
[List of Patents for class 210 subclass 188]    188WITH GAS SEPARATOR:
 This subclass is indented under the class definition.  Apparatus combined with a gas or vapor separator, which is more than a mere vent and must (1) remove gases evolved during a treating operation or (2) treat gas removed from a Class 210 separator.

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472,for a filter with vent means.
539,for a gravitational separator having a vent.

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96Gas Separation: Apparatus,   for apparatus for gas separation, per se. See the Class 210 class definition for an amplification of the line.
  
[List of Patents for class 210 subclass 189]    189PLURAL CHAMBERS WITH MOVEMENT OF GRANULES THEREBETWEEN:
 This subclass is indented under the class definition.  Apparatus comprising means providing distinct chambers or areas for solid-liquid contact with means for circulating granular separatory material between at least two of the chambers.

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268,for a separator having means providing gravity flow of particles therethrough.
270,for moving rehabilitation means which pick up and redeposit particles on the same bed.
271+,for surface traversing rehabilitation means for a particulate material bed.
  
[List of Patents for class 210 subclass 190]    190WITH EXTERNAL SUPPLY MEANS FOR REGENERATING MEDIUM, E.G., WATER SOFTENING SYSTEM:
 This subclass is indented under the class definition.  Apparatus in which means is provided for the purpose of conveying, preparing or storing a liquid which is used to restore a chemical affinity of the separatory medium.
  
[List of Patents for class 210 subclass 191]    191With pump, injector or siphon:
 This subclass is indented under subclass 190.  Apparatus including a pump, injector or siphon.
  
[List of Patents for class 210 subclass 192]    192WITH PRELIMINARY CHEMICAL MANUFACTURE:
 This subclass is indented under the class definition.  Systems comprising means to make one or more of the chemical reagents used in the treatment combined with apparatus of this class.

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715,for processes of seeding with sludge of the system.
716+,for processes including reagent manufacture.

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422Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,   subclasses 186.8+ for ozonizers with preparatory or product treating means; and subclass 186.23 for arc or spark discharge reactors having preparatory or product treating means.
  
[List of Patents for class 210 subclass 193]    193WITH PRECOAT ADDING OR APPLYING MEANS:
 This subclass is indented under the class definition.  Apparatus with means to apply an additional solid material usually discrete particles, as a coating to a filtering medium, the additional material then acting as a primary filtering medium.

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503+,for diverse granular or fibrous filter materials.
506+,for a coated or impregnated filter material.
777+,for separating processes including use of a filter aid.
  
[List of Patents for class 210 subclass 194]    194RECIRCULATION:
 This subclass is indented under the class definition.  Apparatus in which at least a portion of the fluent material is circulated in a closed circuit from and back to the separator.

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167.01through 167.32 , for a structural installation with a closed circulating system.
189,for separatory apparatus including means to circulate filter particles between plural chambers.
621+,712+, 765, and 805, for separating processes including recirculation.
779,for processes with residual returned to prefilt.

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137Fluid Handling,   subclass 268 for infiltration means ancillary to a fluid handling system, and subclass 563 for a closed circulating system of general utility.
204Chemistry: Electrical and Wave Energy,   subclass 238 for an electrolytic cell which includes a filter and recirculating means.
  
[List of Patents for class 210 subclass 195.1]    195.1Serially connected distinct treating or storage units:
 This subclass is indented under subclass 194.  Apparatus including two or more vessels connected in series or two or more zones in a single vessel separated by a baffle connected in series.
(1) Note. The vessels or zones may be either functionally or physically distinct from one another.
  
[List of Patents for class 210 subclass 195.2]    195.2With semipermeable membrane, e.g., dialyzer, etc.:
 This subclass is indented under subclass 195.1.  Apparatus including a septum selective as to composition.
  
[List of Patents for class 210 subclass 195.3]    195.3With sediment recycle means directly to main stream:
 This subclass is indented under subclass 195.1.  Apparatus including means to return sediment to a point upstream with respect to the flow of material to be treated, which means provides for recombination of the sediment with the material to be treated.
  
[List of Patents for class 210 subclass 195.4]    195.4Means is baffle slot:
 This subclass is indented under subclass 195.3.  Apparatus in which the means to return sediment is an aperture in a wall dividing a vessel into separate treating zones.
  
[List of Patents for class 210 subclass 196]    196Of filtrate:
 This subclass is indented under subclass 194.  Apparatus in which filtrate is returned to prefilt.

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409+,for a filter with fluid cleaning involving mere return of filtrate for backwashing.
  
[List of Patents for class 210 subclass 197]    197From bottom of separator:
 This subclass is indented under subclass 194.  Apparatus in which the material recirculated is removed from a bottom portion of the separator.

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713,for processes of precipitation including return of removed solids to the separator.
  
[List of Patents for class 210 subclass 198.1]    198.1WITH MEANS TO ADD TREATING MATERIAL:
 This subclass is indented under the class definition.  Apparatus combined with means to add a treating material.
(1) Note. By "treating material" is meant (a) a material, usually a fluid, having a function other than rehabilitating a separating medium or cleaning a separator, (b) a fluid merely serving as a source of pressure, or (c) a fluid not in itself serving as a separating medium.

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96.1+,for separators with constituent mixture variation controls.
101,for flow fluid pressure or material level proportional feed means.
105,for diverse sensing including control means for an auxiliary liquid inlet.
127,for a float controlled valve controlling an additional fluid inlet.
151,for a separator and gas-liquid surface contact means.
167.11,for liquid purification or separation apparatus comprising a closed circulating system for a swimming pool or spa with means to add a treating material.
167.3,for liquid purification or separation apparatus comprising a closed circulating system with means to add a treating material.
177+,for separators with a heater or heat exchanger and treating fluid addition means.
192,for a separator with preliminary chemical manufacturing means.
296,and 511, for separators using a liquid as a separating medium.
601+,particularly subclasses 11 and 15+, for processes of teating by living organisms.
633,and 634+, for processes of extraction from liquid by solvent or solute.

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137Fluid Handling,   subclasses 87.01+ for self-proportioning and correlating systems; and subclass 268 for holders for materials to be entrained into a fluid handling system.
261Gas and Liquid Contact Apparatus,   subclasses 2+ for such apparatus combined with means for separating constituents from the contact liquid; and subclasses 75+ for gas and liquid contact devices, per se.
422Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,   for extracting, leaching, or dissolving apparatus.
423Chemistry of Inorganic Compounds,   appropriate subclasses for extracting, leaching, or dissolving processes therein provided for; and subclass 658.5 for extracting, leaching, or dissolving processes not otherwise provided for.
  
[List of Patents for class 210 subclass 198.2]    198.2Chromatography:
 This subclass is indented under subclass 198.1.  Apparatus for carrying out the process of chromatography.

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656+,for process involving chromatography.
  
[List of Patents for class 210 subclass 198.3]    198.3Thin layer, e.g., plate, etc:
 Apparatus under subclass under 198.2 utilizing an absorbent cake spread on usually a smooth plate to a depth of about 0.5 mm.
  
[List of Patents for class 210 subclass 199]    199Spaced along flow path:
 This subclass is indented under subclass 198.1.  Apparatus wherein at least two distinct treating material feeding means supply to inlets spaced with respect to the direction of the flow of material being treated.
  
[List of Patents for class 210 subclass 200]    200Plural distinct separators:
 This subclass is indented under subclass 198.1.  Systems comprising a plurality of distinct separating means.

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294+,for diverse distinct separators.
  
[List of Patents for class 210 subclass 201]    201Serially connected:
 This subclass is indented under subclass 200.  Systems connected in such a manner that at least one of the separating means delivers to another.

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137Fluid Handling,   subclasses 571+ for plural tanks or compartments connected for serial flow.
  
[List of Patents for class 210 subclass 202]    202Diverse type:
 This subclass is indented under subclass 201.  Systems comprising at least two different types of separating means.
  
[List of Patents for class 210 subclass 203]    203Filters:
 This subclass is indented under subclass 200.  Apparatus having two or more filtering units.
  
[List of Patents for class 210 subclass 204]    204Sectional chamber press type:
 This subclass is indented under subclass 203.  Apparatus in which the filters are of the sectional chamber press type.

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224+,for other sectional press type filters.
  
[List of Patents for class 210 subclass 205]    205With distinct reactor tank, trough or compartment:
 This subclass is indented under subclass 198.1.  Systems comprising structure providing a distinct reactor tank, trough or compartment wherein the plural in-flows are intermingled to enhance reaction (e.g., precipitation), said tank, trough or compartment being in series with the separator.

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209+,for tanks, troughs or compartments which serve both as a reactor and as a separator.
  
[List of Patents for class 210 subclass 206]    206Chemical holder in series with separator:
 This subclass is indented under subclass 205.  Apparatus comprising a single flow path having the separating means in seral relation with means for holding a chemical.

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199,for plural material inlets spaced along a flow path.
  
[List of Patents for class 210 subclass 207]    207Within gravitational separator:
 This subclass is indented under subclass 205.  Apparatus wherein the reactor tank, trough or compartment is located within the separator which is of the gravitational type.
  
[List of Patents for class 210 subclass 208]    208With mechanical agitator:
 This subclass is indented under subclass 207.  Systems comprising movable mechanical means to cause materials to commingle.

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407+,for fixed filter and liquid agitating means.
  
[List of Patents for class 210 subclass 209]    209Directly applied to separator:
 This subclass is indented under subclass 198.1.  Apparatus provided with means to add the treating material directly to the separator.

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68Textiles: Fluid Treating Apparatus,   appropriate subclasses for textile treating apparatus combined with a liquid remover, particularly subclass 1 for waste reclaiming apparatus, subclasses 5+ for gas steam or mist treating, subclass 18 for solvent recovery, and subclasses 19+ for fluid extractor combinations.
127Sugar, Starch, and Carbohydrates,   subclasses 16+ for means for purging sugar crystals.
  
[List of Patents for class 210 subclass 210]    210To interior of moving filter, e.g., drum:
 This subclass is indented under subclass 209.  Apparatus wherein the material to be separated and the treating material are directly introduced into the interior space of the separator element which moves.

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68Textiles: Fluid Treating Apparatus,   subclasses 12 and 237 for textile treating apparatus having textile washing features in addition to a liquid extractor.
422Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,   subclasses 258+ and 269+ for rotary extractor or leacher.
  
[List of Patents for class 210 subclass 211]    211Through separator supporting rotary shaft:
 This subclass is indented under subclass 210.  Apparatus in which the separator is supported on a rotary shaft having passage means therein through which the treating material is introduced.
  
[List of Patents for class 210 subclass 212]    212With stationary casing closure feature:
 This subclass is indented under subclass 210.  Apparatus in which the filtering rotor is enclosed in a casing having a closure and means attached to or projecting through the closure for feeding treating material to the rotor.
  
[List of Patents for class 210 subclass 213]    213With coaxial rotary impeller or distributor:
 This subclass is indented under subclass 210.  Apparatus in which the filter element is rotary and there is a rotary impeller or distributor for the treating material which is coaxial with the axis of rotation of the filter element.
  
[List of Patents for class 210 subclass 214]    214With stationary mount for movable distributor:
 This subclass is indented under subclass 210.  Apparatus comprising a distributor for the treating material mounted upon a stationary support and movable with respect to such support.
  
[List of Patents for class 210 subclass 215]    215With effluent dividing means:
 This subclass is indented under subclass 210.  Apparatus including means for dividing the separated effluent into a plurality of fractions.

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378,for a centrifugal extractor with a filtrate receiving means having plural filtrate outlets.
  
[List of Patents for class 210 subclass 216]    216Moving filter medium:
 This subclass is indented under subclass 209.  Apparatus by which the additional material is applied to a moving filter medium.
  
[List of Patents for class 210 subclass 217]    217Drum:
 This subclass is indented under subclass 216.  Apparatus in which the moving filter medium comprises a rotary drum.
  
[List of Patents for class 210 subclass 218]    218Gas removed from closed tank:
 This subclass is indented under subclass 209.  Apparatus provided with means to remove gases or vapors from a liquid treating tank which is closed except for fluid handling inlets and/or outlets.

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472,for a vented filter.
  
[List of Patents for class 210 subclass 219]    219With mechanical agitator:
 This subclass is indented under subclass 209.  Apparatus in which there is a mechanical agitator.

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402+,for a drum having an agitator fixed thereto.
407+,for fixed filters with liquid agitating means.
  
[List of Patents for class 210 subclass 220]    220Submerged fluid inlet:
 This subclass is indented under subclass 209.  Apparatus in which the exit from the additional fluid introducing means is submerged in the liquid being treated.

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43Fishing, Trapping, and Vermin Destroying,   subclasses 56+ for minnow buckets having aerating means.
261Gas and Liquid Contact Apparatus,   subclasses 121+ for submerged blast liquid and gas contact devices.
  
[List of Patents for class 210 subclass 221.1]    221.1With outlet at surface, e.g., froth:
 This subclass is indented under subclass 220.  Apparatus in which there is a means to remove a lighter constituent.

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209Classifying, Separating, and Assorting Solids,   subclasses 162+ for flotation processes and apparatus for separating one solid component from another.
  
[List of Patents for class 210 subclass 221.2]    221.2And gas injecting means other than by mechanical agitation:
 This subclass is indented under subclass 221.1.  Apparatus having means to produce a gas other than mechanical agitation.
  
[List of Patents for class 210 subclass 222]    222MAGNETIC:
 This subclass is indented under the class definition.  Apparatus including magnetic treating means.

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167.03,for liquid purification or separation apparatus comprising a closed circulating system for a lubrication system having magnetic treating means.
167.29,for liquid purification or separation apparatus comprising a closed circulating system having magnetic treating means.
695,for processes of precipitation which may involve magnetic separation.

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204Chemistry: Electrical and Wave Energy,   particularly subclasses 155+ for the production of a compound or element by chemical reaction brought about by electrical or wave energy in a magnetic field; subclasses 157.15+ for processes of treating materials involving a chemical reaction brought about by wave energy; and subclasses 660+ for a liquid treatment apparatus which is specialized for: magnetic treatment, per se, when some effect other than mere separation is desired or produced or simultaneous electrical and magnetic separation of the liquid which does not result in the production of a compound or element by chemical reaction brought about by electrical or wave energy in a magnetic field.
209Classifying, Separating, and Assorting Solids,   subclasses 38 , 39, 40, 212, 213+, and 478 for processes and apparatus involving applying a magnetic field to material (which may be suspended in a liquid) for the purpose of separating one solid component from another.
335Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,   subclasses 209+ for magnets and electromagnets, per se.
  
[List of Patents for class 210 subclass 223]    223With additional separator:
 This subclass is indented under subclass 222.  Apparatus in which there is at least one separating means, other than the magnet.
  
[List of Patents for class 210 subclass 224]    224SECTIONAL CHAMBER PRESS TYPE:
 This subclass is indented under the class definition.  Apparatus comprising abutting filter plates or alternating abutting filter plates and spacing frames which are pressed together by at least one movable end member, the end members, plates and/or frames when pressed together constituting a casing which is closed except for fluid handling connections.

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185,for heater or heat exchanger combinations wherein the heater or heat exchanger is embedded or between filter media.
323+,for plural distinct filters.
445,for a filter element clamped in a casing joint.

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100Presses,   appropriate subclasses particularly subclasses 113+ and 194+ for presses which force filter plates or frames towards each other to express the liquid by mechanical pressure.
  
[List of Patents for class 210 subclass 225]    225With residue removal or liquid agitation:
 This subclass is indented under subclass 224.  Apparatus provided with residue removal or liquid agitation means.
  
[List of Patents for class 210 subclass 226]    226With porous filler:
 This subclass is indented under subclass 224.  Apparatus in which the filtering medium comprises a mass of fibers or discrete particles within the filter plates or frames.

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263+,for a particulate material type separator.
317,for spaced diverse filters including nonself supporting media.
343,for stacked elements having liquid distributors separating filter media, including porous masses.
417,for a liquid distributor imbedded in a filter mass.
  
[List of Patents for class 210 subclass 227]    227Medium clamped in joint:
 This subclass is indented under subclass 224.  Apparatus in which the filtering medium is clamped at and between the peripheral edges of plate or frame sections.

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445,for other filter mediums clamped in a casing joint.
  
[List of Patents for class 210 subclass 228]    228With spacing frame:
 This subclass is indented under subclass 227.  Apparatus in which the filtering medium is clamped at and between the peripheral edges of the spacing frames and filter plate sections.
  
[List of Patents for class 210 subclass 229]    229Imperforate base recess in plate:
 This subclass is indented under subclass 227.  Apparatus in which the filter sections are of I or channel cross-section forming a recess, the web of which is imperforate except for filtrate drain openings, and the filter medium abuts the web within the recess.

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455,for modified spacing surfaces or supports for a filter medium.
  
[List of Patents for class 210 subclass 230]    230With repair or assembling means:
 This subclass is indented under subclass 224.  Apparatus including means for assembly or disassembly or to restore or aid in restoring the device to its former condition after decay.
  
[List of Patents for class 210 subclass 231]    231Plates or frames:
 This subclass is indented under subclass 224.  Apparatus comprising frame and/or plate structure, per se, restricted to use with sectional chamber press type filter elements.

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230,for plates and frames having supporting means which aid in assembling and disassembling.
541,for separator adjuncts of general application.

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100Presses,   subclasses 295+ for platens or pressure surfaces there provided for.
  
[List of Patents for class 210 subclass 232]    232WITH REPAIR OR ASSEMBLING MEANS:
 This subclass is indented under the class definition.  Apparatus which is provided with auxiliary means, in addition to the parts making up the separation or treatment apparatus or the means to secure said parts in operative relation, to aid in assembling or disassembling said apparatus or a subcombination thereof; or to restore, or aid in restoring the apparatus or a subcombination thereof to its former condition after decay, injury, or partial destruction.

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230,for a sectional chamber press having repair or assembly means.
329,for separators relatively movable during treatment.
350+,for adjustable means compressing a filter medium within a container even though the operator for the compressing means can be moved to inoperative position.

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137Fluid Handling,   subclasses 315.01 through 329.4for a fluid handling system with repair, tapping, or assembly means.
  
[List of Patents for class 210 subclass 233]    233Piercing or closure knock out means:
 This subclass is indented under subclass 232.  Apparatus for piercing a container, or for knocking out a closure.

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235,for a device in which placement of a container opens a flow controller.
240,for a sealed filter unit provided with a frangible or knockout section for conversion of flow direction.
  
[List of Patents for class 210 subclass 234]    234Removable treatment part with normally disabled flow controller:
 This subclass is indented under subclass 232.  Apparatus comprising a treatment part arranged to be removable and a valve in flow relationship thereto biased to close but being maintained open in normal use of the part.

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235,for a device in which placement of a container opens a flow controller.
  
[List of Patents for class 210 subclass 235]    235Placement of container opens flow controller:
 This subclass is indented under subclass 232.  Apparatus in which the placement of a container opens a flow controller.

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234,for a treatment part maintaining a controller open when in position.
  
[List of Patents for class 210 subclass 236]    236Sliding or rolling on guide means:
 This subclass is indented under subclass 232.  Apparatus including guide means, on which the element to be assembled or disassembled rolls or slides.

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241,for a separator mounted on a movable support.
  
[List of Patents for class 210 subclass 237]    237Hoist or handle means:
 This subclass is indented under subclass 232.  Apparatus comprising (1) a handle attached to a separating element, or (2) means attached to a separating element cooperating with a hoist.

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249,for a leg, hanger or bracket for a filter assembly.
  
[List of Patents for class 210 subclass 238]    238Hand manipulable:
 This subclass is indented under subclass 237.  Apparatus which is hand manipulable.

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244+,for a portable receptacle having a closure with a handle.
464+,for a handled portable receptacle and drainer.
470+,for a filter element having handle means.
  
[List of Patents for class 210 subclass 239]    239CONVERTIBLE:
 This subclass is indented under the class definition.  Apparatus so constructed that its mode of operation can be changed by reassembling all or some of its parts in a different relationship to each other or by addition or omission of a part.

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473+,for a filter unit having adjustable supporting means or having plural supporting surfaces.
  
[List of Patents for class 210 subclass 240]    240Filter having selectively usable flow connector means:
 This subclass is indented under subclass 239.  Apparatus comprising selectively assembable separate flow connections.
  
[List of Patents for class 210 subclass 241]    241WITH MOVABLE SUPPORT:
 This subclass is indented under the class definition.  Apparatus which is movably supported.

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236,for slide or roller guide means for assembly.
237+,for assembling hoist or handle means.
249+,for a bracket or leg support for a static separator assembly.
271+,for the mounting of rehabilitation means for movement with respect to a particulate bed.
359+,for a filter having a medium movable for treating purposes.

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137Fluid Handling,   subclasses 899+ for a vehicle mounted distribution system.
209Classifying, Separating, and Assorting Solids,   subclass 421 for a vehicle mounted sifter.
  
[List of Patents for class 210 subclass 242.1]    242.1Float:
 This subclass is indented under subclass 241.  Apparatus in which the assembly is buoyantly supported.

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121+,for fluid flow or material level responsive floats having a controlling function.
  
[List of Patents for class 210 subclass 242.2]    242.2With aerating means:
 This subclass is indented under subclass 242.1.  Apparatus having means to inject a gas.
  
[List of Patents for class 210 subclass 242.3]    242.3With oil water skimmer:
 This subclass is indented under subclass 242.1.  Apparatus having means to remove the top layer of the oil water system.
  
[List of Patents for class 210 subclass 242.4]    242.4With oil water sorption means:
 This subclass is indented under subclass 242.1.  Apparatus having means to soak up a portion of the oil water system.
  
[List of Patents for class 210 subclass 243]    243ELECTRICAL INSULATING OR ELECTRICITY DISCHARGING:
 This subclass is indented under the class definition.  Apparatus in which parts are electrically insulated or there is means to discharge electricity.

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361Electricity: Electrical Systems and Devices,   subclasses 212+ for static electricity discharging of more general utility.
  
[List of Patents for class 210 subclass 244]    244PORTABLE RECEPTACLE WITH HOOD OR CLOSURE:
 This subclass is indented under the class definition.  Apparatus comprising a filter incorporated in a portable receptacle not having any flow connections attached thereto, which receptacle is provided with (1) a hood, or (2) means forming a complete closure of the top side thereof, which closure may have a foraminous section provided with means for completely covering such section.

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380+,for a rotating centrifugal extractor element having a removable closure.
464+,for a portable receptacle draining type filter.
473+,for a filter removably supported on a portable container.

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141Fluid Material Handling, With Receiver or Receiver Coacting Means,   appropriate subclasses, for fluent material handling devices, with receiver or receiver coacting means.
220Receptacles,   subclasses 24+ for receptacle closures, subclasses 694+ for attachments for receptacles.
222Dispensing,   subclasses 189.06+ for a dispenser having a filter.
297Chairs and Seats,   subclasses 175+ for a seat combined with a pail or the like for milking operations.
  
[List of Patents for class 210 subclass 245]    245Attached variable flow controller:
 This subclass is indented under subclass 244.  Apparatus in which there is a controlling means mounted on or supported by the closure.

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418+,for a filter and flow controller, per se.
  
[List of Patents for class 210 subclass 246]    246Limited opening cover:
 This subclass is indented under subclass 244.  Apparatus provided with means for holding the cover for limited movement with respect to the upper edge of the receptacle so that solids will be retained and liquid escape between the cover and the receptacle upper edge.

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382,for a centrifugal extractor having a discharge between the upper edge of a receptacle and a cover therefor.
464+,for a portable receptacle with attached strainer for draining.
  
[List of Patents for class 210 subclass 247]    247FILTRATE SPLASH PLATE AND/OR DEFLECTOR:
 This subclass is indented under the class definition.  Apparatus provided with a splash plate or deflector located downstream of and spaced from a filter medium.

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456,for a filter with a prefilt flow director or diverter.
  
[List of Patents for class 210 subclass 248]    248WITH DRIP, OVERFLOW OR CONTENT DRAINING FEATURE:
 This subclass is indented under the class definition.  Apparatus with (1) means for receiving drip or overflow, or (2) means to receive the contents of a filter unit when it is disassembled.

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299+,particularly subclasses 312+ for a filter and sediment trap with drain means.

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222Dispensing,   subclasses 108+ for a dispenser with drip, leakage or waste catching features.
  
[List of Patents for class 210 subclass 249]    249BRACKET OR LEG SUPPORT FOR STATIC SEPARATOR ASSEMBLY:
 This subclass is indented under the class definition.  Apparatus provided with a bracket, hanger or leg support for an entire separating assembly.

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468,for a filter having means for supporting it from a receptacle spout.

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248Supports,   appropriate subclasses particularly subclass 94 for a support for a strainer or funnel.
  
[List of Patents for class 210 subclass 250]    250Leg:
 This subclass is indented under subclass 249.  Apparatus in which the filter assembly is supported by means extending directly below and freely resting on a base or attached to a base.

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248Supports,   subclass 188 for leg attaching connections for stands, and subclasses 188.1+ for supporting substructure for a stand.
  
[List of Patents for class 210 subclass 251]    251COMBINED:
 This subclass is indented under the class definition.  Apparatus comprising a device in addition to or combined with separator structure or liquid purification apparatus (1) having functions other than purification or separation, or (2) serving to perfect the purification or separation apparatus for its intended purpose.

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85+,for apparatus with a single, indicator, register, recorder or inspection means.
151,for gas liquid surface contact means and a separator.
153+,for treating apparatus of this class in another installation not sufficiently included to form a basis of classification in the other art class.
173+,for a separator structurally combined with a comminutor.
175+,for treating apparatus with heat exchange.
188,for a liquid separator and a gas separator.
192,for treating apparatus with preliminary chemical manufacture.
239+,for a convertible feature of treating apparatus.
241+,for treating apparatus with a movable support.
243,for electrical insulating or discharging.
249+,for a support for a separator.
418+,for a filter and a flow controller.
456,for prefilt restrictors or diverters.

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4Baths, Closets, Sinks, and Spittoons,   subclasses 286+ for strainers in devices of that type.
  
[List of Patents for class 210 subclass 252]    252SERIALLY CONNECTED DISTINCT TREATING WITH OR WITHOUT STORAGE UNITS:
 This subclass is indented under the class definition.  Apparatus comprising plural distinct treating or storage casings connected by means for transferring material from one unit to another.

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172.1through 172.6 , for a structural installation in which the separator is ancillary to a storage tank.
181,for flow line connected heater or heat exchanger.
201+,for similar subject matter with means to add material.
  
[List of Patents for class 210 subclass 253]    253Parallel:
 This subclass is indented under subclass 252.  Apparatus in which two or more units are in parallel.
  
[List of Patents for class 210 subclass 254]    254With by-pass:
 This subclass is indented under subclass 252.  Apparatus in which there is a means to bypass one or more units.

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130+,for a fluid pressure responsive bypass.
433+,for a bypass around a filter.
  
[List of Patents for class 210 subclass 255]    255Cascade:
 This subclass is indented under subclass 252.  Apparatus in which the units or parts thereof are in stepped relationship.

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262,for serial diverse units one above another.
  
[List of Patents for class 210 subclass 256]    256One unit inside another:
 This subclass is indented under subclass 252.  Apparatus in which one unit is within another.

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207+,for a distinct reactor, tank trough or compartment within a gravitational separator.
315,for a diverse spaced filter within another.
337+,for nested distinct separators in series.
342,for one separator within another.
  
[List of Patents for class 210 subclass 257.1]    257.1With storage unit:
 This subclass is indented under subclass 252.  Apparatus in which at least one of the units merely holds liquid.

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137Fluid Handling,   subclasses 571+ for plural tanks or compartments connected for serial flow.
184Lubrication,   subclass 1.5 for crankcase service apparatus including separators.
  
[List of Patents for class 210 subclass 257.2]    257.2Having membrane:
 This subclass is indented under subclass 257.1.  Apparatus constructed with a filtering means composed of a thin, enveloping or lining substance, i.e., membrane.

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96.2,for a membrane in an apparatus with constituent mixture variation responsive.
348+,for apparatus which uses a semipermeable septum which does not provide for continuous streams on both sides of the septum.
433+,for similar apparatus which uses an ordinary filter septum.
500.1,for a membrane, per se.
541,for membrane supports, frames, and spaces.
634+,for process of using a septum selective as to composition.

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127Sugar, Starch, and Carbohydrates,   subclass 10 for a sugar solution dialyzer.
204Chemistry: Electrical and Wave Energy,   subclasses 252+ for a similar device using an electric current.
604Surgery,   subclasses 4.01 , 5.01-5.04, 6.01-6.09, 6.01, 6.11-6.16 for drawing blood from the body, treating the blood, and returning it the body.
  
[List of Patents for class 210 subclass 258]    258With pump, gas pressure or vacuum source:
 This subclass is indented under subclass 252.  Apparatus provided with (1) a pump, (2) means to supply a gas under pressure to cause fluid flow, or (3) means for applying a vacuum to at least one of the units.

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406,for a filter with a vacuumized filtrate receiver.
416,for a filter with a pump, gas pressure or vacuum source.
  
[List of Patents for class 210 subclass 259]    259Diverse:
 This subclass is indented under subclass 252.  Apparatus in which the units differ from each other as to their separating structure.

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294+,for diverse distinct separators.
  
[List of Patents for class 210 subclass 260]    260Including multiple operation unit:
 This subclass is indented under subclass 259.  Apparatus in which more than one operation is accomplished in a single unit.
  
[List of Patents for class 210 subclass 261]    261One unit supports another:
 This subclass is indented under subclass 259.  Apparatus in which one unit supports another.
  
[List of Patents for class 210 subclass 262]    262On different levels:
 This subclass is indented under subclass 259.  Apparatus in which units are at different levels.

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255,for serial units in cascade relationship.
261,for serial units in which one supports another.
  
[List of Patents for class 210 subclass 263]    263PARTICULATE MATERIAL TYPE SEPARATOR, E.G., ION EXCHANGE OR SAND BED:
 This subclass is indented under the class definition.  Apparatus comprising a bed of discrete particles each capable of movement within the bed and readily separable from each other.

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118,for flow of fluid pressure responsive operation of sand valves.
189,for plual chambers with movement of granules therebetween.
190+,for a separator with external supply means for regenerating material in, water softening systems,
193,for a filter with precoat adding or supplying means.
226,for a sectional chamber press type filter with a porous filler.
317,for spaced filters including a nonself-supporting medium.
350+,for a filter with movable means to compress a medium.
500.1+,for filter materials, particularly subclasses 503+ for diverse granular or fibrous materials.
615,for processes of aerobic treatment utilizing contact surfaces.
660+,for processes involving ion exchange or sorption.
767+,for separating processes, particularly subclasses 777+ for processes employing precoats or filter-aids, and subclass 80 for separating and rehabilitation of a particulate bed.

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96Gas Separation: Apparatus,   subclasses 108+ for solid sorbent apparatus for gas separation.
166Wells,   subclasses 51 and 278 for processes of and apparatus for forming gravel filters in wells.
  
[List of Patents for class 210 subclass 264]    264Selective units or compartments:
 This subclass is indented under subclass 263.  Apparatus comprising a plurality of compartments, and means for using and/or rehabilitating the particles in each compartment selectively.

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102,for programming of plural units by means responsive to flow, fluid pressure or material level responsive means.
142,for program actuated sequentially controlled plural units or sections.
  
[List of Patents for class 210 subclass 265]    265With gravitational separator:
 This subclass is indented under subclass 263.  Apparatus combined with a gravitational separator.
  
[List of Patents for class 210 subclass 266]    266With spaced non-particulate separating means:
 This subclass is indented under subclass 263.  Apparatus combined with an additional separating means other than a particulate material type and spaced therefrom.

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265,for a gravitational separator combined with a particulate material.
273,279, 289, and 291+, for a particulate material type separator having a fluid distributor even though such distributor be foraminous and may incidentally separate large particles.
283,for a pervious separator contacting and between particulate beds.
  
[List of Patents for class 210 subclass 267]    267Trunnion mounted casing:
 This subclass is indented under subclass 263.  Apparatus in which the bed of separating material is contained in a casing mounted for rotation.

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399,for another filter element mounted within a closed movable casing.
  
[List of Patents for class 210 subclass 268]    268Gravity flow of particles type:
 This subclass is indented under subclass 263.  Apparatus in which means is provided for removing particles from the bottom of the bed so that the bed of separating material as a whole moves downwardly by gravity.

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189,for apparatus wherein the particles are moved between plural containers or plural compartments in the same container.
270,for apparatus which is provided with moving means to pick up and redeposit the particles during rehabilitation.
  
[List of Patents for class 210 subclass 269]    269With rehabilitation means:
 This subclass is indented under subclass 263.  Apparatus in which means is provided for restoring the separating medium to the condition it was in before separation.

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189,for such a device with a separate rehabilitation chamber.
190,for a chamber provided with external regenerating medium supply.
407+,for a filter combined with residue removal of liquid agitation means.
656+,and 660+, for processes of ion exchange or sorption involving rehabilitation of the separation medium.
791+,for separating processes involving rehabilitation of a filtering medium.
  
[List of Patents for class 210 subclass 270]    270Movable means for particle pickup and redeposit:
 This subclass is indented under subclass 269.  Apparatus having moving means to pick up particles from the bed and redeposit them on the bed.

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189,for apparatus wherein the particles are moved between plural containers or plural compartments in the same container.
268,for a particle type separator with gravity flow of the particles from the bottom of the bed.

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299Mining or In Situ Disintegration of Hard Material,   subclasses 7+ for mining combined with separating.
  
[List of Patents for class 210 subclass 271]    271Surface traversing type:
 This subclass is indented under subclass 269.  Apparatus having rehabilitation means which moves in a path parallel to and above the upper bed surface with or without parts projecting into the bed.

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270,for apparatus having moving means to pick up and redeposit the particles of the separating medium.
  
[List of Patents for class 210 subclass 272]    272Rotating on stationary axis:
 This subclass is indented under subclass 271.  Apparatus in which the rehabilitation means is rotatable about a stationary axis.
  
[List of Patents for class 210 subclass 273]    273Moving fluid distributor:
 This subclass is indented under subclass 271.  Apparatus which is provided with moving means for introducing a fluid to the bed.

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274,for nonsurface traversing means to apply gas to a bed.
  
[List of Patents for class 210 subclass 274]    274Including means to apply gas to bed:
 This subclass is indented under subclass 269.  Apparatus comprising means to introduce gas into the separating medium.

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198.1,for a separator with means to add a treating fluid, particularly subclasses 220+ for a separator with submerged fluid inlet.
  
[List of Patents for class 210 subclass 275]    275Backwash or blowback means:
 This subclass is indented under subclass 269.  Apparatus including means for passing a fluid through the medium in a direction of flow during separation.

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411,425 and 427, for similar apparatus in another type of filter.
  
[List of Patents for class 210 subclass 276]    276With mechanical agitator or residue remover:
 This subclass is indented under subclass 275.  Apparatus in which mechanical means is provided for agitating the bed or removing residue therefrom.

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273,for apparatus provided with a movable imbedded fluid distributor which functions as an agitator as well as a distributor.
  
[List of Patents for class 210 subclass 277]    277Flow controller external of closed casing:
 This subclass is indented under subclass 275.  Apparatus in which flow of fluid is controlled by a flow controller external of the casing.

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190,for external supply for regenerating medium combinations.
418+,for a filter with a flow controller.
  
[List of Patents for class 210 subclass 278]    278Multi-way valve unit:
 This subclass is indented under subclass 277.  Apparatus in which a single valve controls communication with three or more flow lines.

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424+,for a filter with a multiway valve.

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137Fluid Handling,   subclasses 625+ for multiway valves, per se.
  
[List of Patents for class 210 subclass 279]    279With embedded fluid distributor:
 This subclass is indented under subclass 275.  Apparatus having a stationary fluid distributor extending into the bed.

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289,and 291+, for another particulate bed and a fluid distributor.
  
[List of Patents for class 210 subclass 280]    280With agitator:
 This subclass is indented under subclass 269.  Apparatus in which means in provided for agitating the bed.

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271+,for apparatus including bed surface traversing means which may also function as an agitator.
276,for a particulate bed separator with backwash means and agitator.
407+,for other types of filters with residue remover or agitators.
  
[List of Patents for class 210 subclass 281]    281With access opening to normally closed casing:
 This subclass is indented under subclass 269.  Apparatus wherein a closed casing which holds particulate material is provided with an opening through which the separatory material may be reached, or through which solid regenerating material may be inserted.

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268,for gravity flow of particulate material in a separator.
  
[List of Patents for class 210 subclass 282]    282Removable cartridge or hand-manipulated container:
 This subclass is indented under subclass 263.  Apparatus in which separatory material is encased in a magazine type holder or container.

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237+,for handle assembly means.
465,for a separator provided with handles for draining.
470,for a handled filter.
484,for a shaped filter element with a foraminous container or sheath.
  
[List of Patents for class 210 subclass 283]    283Pervious divider between and contacting beds:
 This subclass is indented under subclass 263.  Apparatus comprising plural beds separated by and each contacting pervious means therebetween.

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266,for a particulate type separator combined with a spaced nonparticulate separating means.
  
[List of Patents for class 210 subclass 284]    284Spaced beds:
 This subclass is indented under subclass 263.  Apparatus which comprises a plurality of beds of particulate material which are spaced from each other.

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266,for spaced particulate and nonparticulate type separators.
283,for a pervious separator which contacts and is between beds.
314+,for spaced diverse filters.
  
[List of Patents for class 210 subclass 285]    285Embedded baffle:
 This subclass is indented under subclass 263.  Apparatus provided with at least one baffle completely or partially embedded in the particulate material.
  
[List of Patents for class 210 subclass 286]    286Vertical:
 This subclass is indented under subclass 285.  Apparatus in which the baffle extends vertically.
  
[List of Patents for class 210 subclass 287]    287Within flow line or flow line connected closed casing:
 This subclass is indented under subclass 263.  Apparatus wherein the separatory material is confined within a container which is imperforate except for fluid conduit openings or access openings closed in normal operation.

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435+,for fixed filter mediums within a flow line connected closed casing.
  
[List of Patents for class 210 subclass 288]    288Conduit through bed, inlet and outlet at same end of casing:
 This subclass is indented under subclass 287.  Apparatus in which all the inlets and outlets to the casing are located at the same end of the casing, one communicating with the bed by means of a conduit surrounded by the bed.

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439,for a nonparticulate type filter having similar structure.
  
[List of Patents for class 210 subclass 289]    289With particular liquid receiving means or foraminous bed retainer:
 This subclass is indented under subclass 287.  Apparatus which comprises particular means for introducing the untreated liquid to the bed of separatory material, particular means for collecting treated liquid from the bed of separatory material, or particular strainer means within the casing.
  
[List of Patents for class 210 subclass 290]    290With multi-layer beds:
 This subclass is indented under subclass 263.  Apparatus having a bed comprising a plurality of layers of particulate material which are in contact with each other.

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283,for a pervious divider between and contacting the beds.
284,for similar apparatus in which the beds are spaced from each other.
286,for vertical layers.
  
[List of Patents for class 210 subclass 291]    291Particular liquid receiving means or foraminous bed retainer:
 This subclass is indented under subclass 263.  Apparatus comprising particular means for introducing liquid into a bed of separating material, particular means for removing liquid from a bed of separating material, or particular strainer means within the casing.

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172.1through 172.6 , for a structural installation in which the separator is ancillary to a storage tank.
289,for apparatus of this type which is within a flow line or flow line connected closed casing.

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405Hydraulic and Earth Engineering,   subclass 36 for fluid distributing or collecting apparatus buried in the earth.
  
[List of Patents for class 210 subclass 292]    292Hood or top protector type:
 This subclass is indented under subclass 291.  Apparatus in which the liquid distributing means is provided with (1) an imperforate cap or hood extending around or over it, or (2) caps or hoods over openings in the distributor.

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118,for a sand valve, i.e., nonclosing check valve associated with a sand bed.
456,for a filter with prefilt flow director or distributor.
  
[List of Patents for class 210 subclass 293]    293Floor type, e.g., false bottom:
 This subclass is indented under subclass 291.  Apparatus wherein the bed retainer comprises a pervious floor.
  
[List of Patents for class 210 subclass 294]    294DIVERSE DISTINCT SEPARATORS:
 This subclass is indented under the class definition.  Apparatus having plural separation means identifiable as separate units, (1) of different kinds, or (2) of the same kind but differing in shape or other structure other than different mesh size.

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124,for float control between two separators.
132,for a fluid pressure responsive by-pass and an additional separator.
142,for plural units operated by a program actuator.
151,for gas-liquid surface contact means and a separator.
155,for plural or diverse flume screens.
182+,for a heater or heat exchanger and diverse separators.
188,for a liquid treater and gas separator.
189,for plural chambers with movement of granules therebetween.
195.1,for recirculation between serially connected distinct treating or storage units.
200+,for plural distinct separators and means to add a treating material.
223,for a magnetic and another separator.
252+,for serially connected distinct treating units with or without a storage unit.
263+,particularly subclasses 265, 266 and 284, for particulate bed type separators.
322+,for plural distinct separators of the same kind.
483+,particularly subclasses 488+ for single filter units formed by contacting filter mediums.
521+,for superposed compartment gravitational separators.
663+,for processes of ion exchange or sorption with preliminary separation.
806,for plural separating processes.

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209Classifying, Separating, and Assorting Solids,   subclasses 12.1+ for combined classifying, separating and assorting of solids.
  
[List of Patents for class 210 subclass 295]    295Including a filter:
 This subclass is indented under subclass 294.  Apparatus in which at least one of the diverse distinct separators is a filter.
  
[List of Patents for class 210 subclass 296]    296Including liquid as a separating medium:
 This subclass is indented under subclass 295.  Apparatus in which a separating medium comprises a liquid.

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511,for a single operation apparatus using liquid as a separating medium.
633,and 634+, for separating processes involving extraction from a liquid by solvent or solute.
  
[List of Patents for class 210 subclass 297]    297Moving filter medium:
 This subclass is indented under subclass 295.  Apparatus in which there is means to give the filter medium motion during the filtering operation.

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359+,for movable medium filters, per se.
  
[List of Patents for class 210 subclass 298]    298With mechanical residue or sediment mover:
 This subclass is indented under subclass 295.  Apparatus having driven mechanical means to remove residue or sediment.

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390+,for a moving filter medium and a residue remover.
407+,for a fixed filter medium and a residue remover.
523+,for a gravitational separator and a mechanical sediment mover.
  
[List of Patents for class 210 subclass 299]    299Including constituent trapping feature:
 This subclass is indented under subclass 295.  Apparatus including a feature depending upon the different specific gravities of constituents of a liquid mixture for removing a constituent or trapping it in a recess.

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248,for drip or overflow catchers or means for receiving the contents of a filter unit when the casing is opened.
  
[List of Patents for class 210 subclass 300]    300Alternate filters and traps in series:
 This subclass is indented under subclass 299.  Apparatus in which the liquid is passed through (1) at least two filter media, a constituent trap being positioned therebetween, or (2) at least two constituent traps with a filter medium therebetween.
  
[List of Patents for class 210 subclass 301]    301Plural traps:
 This subclass is indented under subclass 300.  Apparatus in which at least two constituent traps are provided.
  
[List of Patents for class 210 subclass 302]    302Flow-line valve upstream of separator:
 This subclass is indented under subclass 299.  Apparatus provided with a valve in a flow line upstream of the separating means.

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136,for a check valve upstream of a separator.
  
[List of Patents for class 210 subclass 303]    303Cut-off sediment trap:
 This subclass is indented under subclass 299.  Apparatus having a valve arranged to isolate a sediment chamber from a filter unit.

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418+,for a filter with a flow controller.
  
[List of Patents for class 210 subclass 304]    304Tangential flow, spiral or convolute baffle:
 This subclass is indented under subclass 299.  Apparatus in which there is a spiral or convolute baffle or tangential liquid inlet to give the liquid a whirling motion.

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512.1,for a gravitational separator having tangential flow or centrifugal fluid action.
  
[List of Patents for class 210 subclass 305]    305Baffle preceding or within sediment trap:
 This subclass is indented under subclass 299.  Apparatus provided with a baffle member to deflect liquid entering a sediment chamber or a baffle within a sediment chamber to catch sediment or quiet flow.

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304,for a sediment trap and filter with spiral or convolute baffle means or a tangential inlet.
  
[List of Patents for class 210 subclass 306]    306Deflecting prefilt from filter medium:
 This subclass is indented under subclass 305.  Apparatus in which the baffle deflects prefilt from the filtering medium.

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456,for a filter with prefilt a flow distributor or diverter.
  
[List of Patents for class 210 subclass 307]    307Downstream of filter medium:
 This subclass is indented under subclass 299.  Apparatus in which the sediment removing, trapping or removing feature is downstream of the filter, to remove sediment from the filtrate.

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300+,for alternate traps and filters.
  
[List of Patents for class 210 subclass 308]    308Directly communicating with tubular filter interior:
 This subclass is indented under subclass 299.  Apparatus in which a sediment trap directly communicates with the interior of a tubular filter element.
  
[List of Patents for class 210 subclass 309]    309Attached to filter element:
 This subclass is indented under subclass 308.  Apparatus in which the filter element and the sediment chamber means are directly attached to each other.

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454,for a filter within a flow line connected casing which filter element is attached to a casing closure.
  
[List of Patents for class 210 subclass 310]    310Lateral trap:
 This subclass is indented under subclass 299.  Apparatus in which the liquid flows generally axially through a conduit containing the filter medium and there is means communicating with the sediment trap, which extends laterally of the axis of the conduit.

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447,for a laterally removable filter element.
  
[List of Patents for class 210 subclass 311]    311Downflow inlet, upflow through filter medium:
 This subclass is indented under subclass 299.  Apparatus in which entering liquid flows downwardly and then passes through the filter medium in an upward direction.

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305+,for filter and constituent trap means with a baffle preceding or within the sediment trap.
456,for a filter with a prefilt flow distributor or diverter.
  
[List of Patents for class 210 subclass 312]    312Sediment discharge means:
 This subclass is indented under subclass 299.  Apparatus provided with means discharging sediment.

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422+,for a closed casing filter and a variable flow controller which casing has plural outlets for flushing the casing or diverting prefilt around the filter medium.
433.1,for a filter in a casing having filtered and unfiltered passages.
533+,for a gravitational separator with a closure or valve controlled discharge.
  
[List of Patents for class 210 subclass 313]    313Valve controlled:
 This subclass is indented under subclass 312.  Apparatus in which the drain means is controlled by a valve.

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109+,for automatic discharge of treated material.
  
[List of Patents for class 210 subclass 314]    314Spaced filters:
 This subclass is indented under subclass 295.  Apparatus which comprises a plurality of isolated filters or filter elements abutting along a surface to enclose an empty space.

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323+,for plural distinct similar filters.
  
[List of Patents for class 210 subclass 315]    315One within another:
 This subclass is indented under subclass 314.  Apparatus wherein one of the filters surrounds the other.
  
[List of Patents for class 210 subclass 316]    316One adjacent inlet or outlet conduit:
 This subclass is indented under subclass 314.  Apparatus wherein one filter is arranged in such a manner that entering liquid contacts the filter before contacting any part of the casing, or leaving liquid once having contacted the filter, does not contact the casing.

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335+,for plural similar filters arranged for series prefilt flow.
338,and 342, for plural distinct similar filter elements arranged one within another.
464+,for a portable receptacle draining filter.
  
[List of Patents for class 210 subclass 317]    317Including non-self-supporting medium:
 This subclass is indented under subclass 314.  Apparatus in which one or more of the filters include loose or flaccid nonparticulate material.

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263+,for particulate material type separators, particularly subclass 266 for particulate and spaced nonparticulate separators.
484,for filter medium within a foraminous container or sheath.
496,for shaped bound, fused or matted filter mediums.
500+,for filter materials.
  
[List of Patents for class 210 subclass 318]    318Incompatible shapes:
 This subclass is indented under subclass 314.  Apparatus in which the separate filters are of such shapes that they cannot be nested or superimposed.
  
[List of Patents for class 210 subclass 319]    319With agitator:
 This subclass is indented under subclass 294.  Apparatus in which there is a mechanical agitator to impel liquid to break up, remove or prevent scum.

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198+,particularly subclasses 207+ and 219, for a separator with means to add material.
407+,for a filter having a fixed medium combined with an agitator.
  
[List of Patents for class 210 subclass 320]    320With baffle perpendicular to flow direction:
 This subclass is indented under subclass 294.  Apparatus in which there is a baffle perpendicular to the direction of liquid flow.

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348+,for apparatus which uses a semipermable septum which does not provide for continuous streams on both sides of the septum.
513+,for a gravitational separator.
  
[List of Patents for class 210 subclass 321.6]    321.6CASING DIVIDED BY MEMBRANE INTO SECTIONS HAVING INLET(S) AND/OR OUTLET(S):
 This subclass is indented under the class definition.  Apparatus comprising a casing sealingly divided by a barrier comprising a semipermeable membrane into at least two sections, each section having means providing liquid inlet and/or outlet provided by said semipermeable membrane.

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604Surgery,   subclass 507 for methods of introducing material into or removing it from the human vasculature system
  
[List of Patents for class 210 subclass 321.61]    321.61Membrane secured with adhesive of specified composition:
 This subclass is indented under subclass 321.6.  Apparatus including an adhesive of specified composition securing at least one membrane.
  
[List of Patents for class 210 subclass 321.62]    321.62Antithrombogenic membrane:
 This subclass is indented under subclass 321.6.  Apparatus including at least one membrane having at least a portion thereof modified (e.g., by chemical treatment or ionizing radiation) to be antithrombogenic.
  
[List of Patents for class 210 subclass 321.63]    321.63Rotating mechanical agitator adjacent membrane:
 This subclass is indented under subclass 321.6.  Apparatus including a rotating mechanical agitator (e.g., stirrer) adjacent a membrane.
  
[List of Patents for class 210 subclass 321.64]    321.64Plural diverse structured membranes within a single casing:
 This subclass is indented under subclass 321.6.  Apparatus including plural diverse structured membranes (e.g., stirrer) adjacent a membrane.

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641,for processes utilizing plural diverse membranes.
  
[List of Patents for class 210 subclass 321.65]    321.65Permeated liquid quantity measurement or control:
 This subclass is indented under subclass 321.6.  Apparatus including means to measure and/or control a quantity of liquid which has permeated through a membrane (e.g., ultraflitrate, dialysate, etc.).

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929,for hemoultrafiltrate volume measurement or control processes.
  
[List of Patents for class 210 subclass 321.66]    321.66Energy recovery from treated liquid:
 This subclass is indented under subclass 321.6.  Apparatus including means for energy recovery (e.g., turbine, flow work exchanger, etc.), from a treated liquid.
  
[List of Patents for class 210 subclass 321.67]    321.67Membrane movement during purification:
 This subclass is indented under subclass 321.6.  Apparatus including means causing membrane movement during liquid purification.
  
[List of Patents for class 210 subclass 321.68]    321.68Nontranslatory rotary:
 This subclass is indented under subclass 321.67.  Apparatus wherein said means causes nontranslatory rotary membrane movement during liquid purification.
  
[List of Patents for class 210 subclass 321.69]    321.69With membrane cleaning or sterilizing means (other than by filter movement or rotating agitator):
 This subclass is indented under subclass 321.6.  Apparatus including means providing membrane cleaning (removing accumulated undesired material) or sterilizing (destroying a pathogenic micro-organism), other than by a rotating mechanical agitator or membrane movement.

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321.63,and 321.67, for membrane cleaning apparatus including a rotating mechanical agitator or membrane movement.
636,for processes of cleaning or sterilizing.
  
[List of Patents for class 210 subclass 321.7]    321.7Solid cleaning material (e.g., balls):
 This subclass is indented under subclass 321.69.  Apparatus wherein said means providing membrane cleaning or sterilizing includes a plurality of solid discrete object other than a rotating mechanical agitator, e.g., particles, granules, sponge balls, beads, etc., and means for moving said object, adjacent to and/or in contact with, a membrane, for cleaning or sterilizing said membrane.

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321.63,for apparatus including a rotating mechanical agitator.
  
[List of Patents for class 210 subclass 321.71]    321.71Dialyzer with dialysate proportioning means:
 This subclass is indented under subclass 321.6.  Apparatus including a dialyzer and means for proportioning dialysate fed to said dialyzer.
  
[List of Patents for class 210 subclass 321.72]    321.72Each section having inlet(s) and outlet(s):
 This subclass is indented under subclass 321.6.  Apparatus further comprising each said section having at least one means providing liquid inlet and at least one means providing liquid outlet.
  
[List of Patents for class 210 subclass 321.73]    321.73Noncoiled nonannular cross section tube:
 This subclass is indented under subclass 321.72.  Apparatus wherein at least on e membrane is, (a) generally tubular, (b) noncylindrical in defining a cross section (said cross section being taken perpendicularly to the central axis of the tube) which is nonannular (e.g., inner and/or outer surface(s) define noncircular cross section), and (c) not coiled.
(1) Note. A coiled flatted membrane tube is provided for in subclasses 321.74 and 321.83.
  
[List of Patents for class 210 subclass 321.74]    321.74Coiled membrane:
 This subclass is indented under subclass 321.72.  Apparatus said semipermeable membrane is a strip or flattened tube (i.e., is noncyclindrical) which is spirally coiled (e.g., including either a planar spiral or a helical spiral).
  
[List of Patents for class 210 subclass 321.75]    321.75Planar membrane:
 This subclass is indented under subclass 321.72.  Apparatus wherein said semipermeable membrane is in an essentially planar configuration.
  
[List of Patents for class 210 subclass 321.76]    321.76Spiral flow:
 This subclass is indented under subclass 321.75.  Apparatus including means providing spiral liquid flow (moving essentially in a plane around a center with increasing or decreasing distance from said center) adjacent a membrane(s).
  
[List of Patents for class 210 subclass 321.77]    321.77Pleated membrane:
 This subclass is indented under subclass 321.72.  Apparatus wherein said semipermeable membrane is pleated (i.e., folded back and forth).
  
[List of Patents for class 210 subclass 321.78]    321.78Cylindrical membrane:
 This subclass is indented under subclass 321.72.  Apparatus wherein said semipermeable membrane comprises at least one hollow generally cylindrical tube.
  
[List of Patents for class 210 subclass 321.79]    321.79Plural cylindrical membrane all connected for parallel flow:
 This subclass is indented under subclass 321.78.  Apparatus including plural cylindrical semipermeable membrane tubes all or which, are connected for parallel flow therethrough (i.e., each said tube has, a first end directly communicating with a first end directly communicating with a first header, and a second end directly communication with a second Header), and are within a single casing.
  
[List of Patents for class 210 subclass 321.8]    321.8All cylindrical membranes are parallel:
 This subclass is indented under subclass 321.79.  Apparatus wherein all said plural cylindrical semipermeable membrane tubes are parallel with respect to each other.
  
[List of Patents for class 210 subclass 321.81]    321.81With embedded baffle:
 This subclass is indented under subclass 321.8.  Apparatus wherein a baffle which is a solid material, which serves as a flow restrictor, diverter or distributor, is embedded between said plural parallel cylindrical semipermeable membrane tubes such that, a straight line drown from an exterior active surface (e.g., a membrane tube sheet, etc.), or any one of said tubes, perpendicular to a longitudinal axis of that tube, to an exterior active surface of any other of said tubes, intersects said baffle.
  
[List of Patents for class 210 subclass 321.82]    321.82Noncoiled nonannular cross section tube:
 This subclass is indented under subclass 321.6.  Apparatus wherein at least one membrane is, (a) generally tubular, (b) noncylindrical in defining a cross section (said cross section being taken perpendicularly to the central axis of the tube) which is nonannular (e.g., inner and/or outer surface(s) define noncircular cross section, and (c) not coiled.
(1) Note. A coiled flattened membrane tube is provided for in subclasses 321.74 and 321.83.
  
[List of Patents for class 210 subclass 321.83]    321.83Coiled membrane:
 This subclass is indented under subclass 321.6.  Apparatus wherein said semipermeable membrane is a strip or flattened tube (i.e., is noncylindrical), which is spirally coiled (e.g., including either a planar spiral or a helical spiral).
  
[List of Patents for class 210 subclass 321.84]    321.84Planar membrane:
 This subclass is indented under subclass 321.6.  Apparatus wherein said semipermeable membrane is in an essentially planar configuration.
  
[List of Patents for class 210 subclass 321.85]    321.85Spiral flow:
 This subclass is indented under subclass 321.84.  Apparatus including means providing spiral liquid flow (moving essentially in a plane around a center with increasing or decreasing distance from said center adjacent a membrane(s).
  
[List of Patents for class 210 subclass 321.86]    321.86Pleated membrane:
 This subclass is indented under subclass 321.6.  Apparatus wherein said semipermeable membrane is pleated, i.e., folded back and forth.
  
[List of Patents for class 210 subclass 321.87]    321.87Cylindrical membrane:
 This subclass is indented under subclass 321.6.  Apparatus wherein said semipermeable membrane comprises at least on hollow, generally cylindrical tube.
  
[List of Patents for class 210 subclass 321.88]    321.88Plural cylindrical membranes all connected for parallel flow:
 This subclass is indented under subclass 321.87.  Apparatus including plural cylindrical semipermeable membrane tubes all of which, are connected for parallel flow therethrough (i.e., each said tube has a first end directly communication with a first header, and a second end directly communication with a second header), and are within a single ceasing.
  
[List of Patents for class 210 subclass 321.89]    321.89All cylindrical membranes are parallel:
 This subclass is indented under subclass 321.88.  Apparatus wherein all said plural cylindrical semipermeable membrane tubes are parallel with respect to each other.
  
[List of Patents for class 210 subclass 321.9]    321.9With embedded baffle:
 This subclass is indented under subclass 321.89.  Apparatus wherein a baffle which is a solid material, which serves as a flow restrictor, diverter or distributor, is embedded between said plural parallel cylindrical semipermeable membranse tubes such that, a straight line drawn fro an exterior active surface (e.g., a membrane tube surface not covered by casting resin, tube sheet, etc.) of any one of said tubes perpendicular to a lingitudinal axis of that tube, to an exterior active surface of any other of said tubes, intersects said baffle.
  
[List of Patents for class 210 subclass 322]    322PLURAL DISTINCT SEPARATORS:
 This subclass is indented under the class definition.  Apparatus comprising two or more distinct separators each of which treats a portion of a liquid mixture.

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252+,for serially connected distinct treating units with or without storage units.
294+,for diverse distinct separators.
488+,for superimposed contacting filter mediums forming a single element even though defined as differing in kind.
521,for a gravitational separator with superposed compartments.
  
[List of Patents for class 210 subclass 323.1]    323.1Filters:
 This subclass is indented under subclass 322.  Apparatus in which there are plural distinct filter units.

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314,for diverse types of filters in a single unit.
  
[List of Patents for class 210 subclass 323.2]    323.2Tublar:
 This subclass is indented under subclass 323.1.  Apparatus tubelike in form with filtration through the perpendicular axis of the tube.
  
[List of Patents for class 210 subclass 324]    324Movable separating elements:
 This subclass is indented under subclass 323.1.  Apparatus which are movable for material treating purposes.

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359+,for a movable filter which may comprise compartments or sections abutted to form a single effective surface.
  
[List of Patents for class 210 subclass 325]    325Planetary:
 This subclass is indented under subclass 324.  Apparatus in which each rotates about an individual axis and also moves about another axis, the construction being such that rotation about both axes are or can be continuous during operation.

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370,for a centrifugal extractor wherein the filter medium has plural motions about a fixed point.
  
[List of Patents for class 210 subclass 326]    326Drum type on parallel axis:
 This subclass is indented under subclass 324.  Apparatus comprising plural rotary filter drums arranged on parallel axes which drums are of the type in which prefilt contacts the outer periphery of both drums simultaneously and the filtrate flows to their interiors in parallel.
  
[List of Patents for class 210 subclass 327]    327Plural cleaners and plural movable elements:
 This subclass is indented under subclass 324.  Apparatus with plural cleaning means.

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330+,for plural moving filter units connected for group operation.
334,for plural fixed units and alternating cleaners.
  
[List of Patents for class 210 subclass 328]    328Pivotally mounted sections:
 This subclass is indented under subclass 324.  Apparatus connected by hinges or mounted on parallel pivots so that they can be partially rotated to dump the cake (residue).

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370,for a centrifugal extractor wherein the basket is made up of plural sections which are pivotally mounted for discharging the portion of the residue thereon.
385,for a filter unit having plural motions.
  
[List of Patents for class 210 subclass 329]    329Relatively movable:
 This subclass is indented under subclass 324.  Apparatus in which at least one filter and its support moves with respect to another, usually for cleaning while at least one remains in filtering service.

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232+,particularly subclasses 237+ for a separator with repair or assembly means for removal of a filter from its casing.
328,for filters comprising pivotally mounted sections.
341,for parallel units individually controlled, so that a selected unit can be removed.
  
[List of Patents for class 210 subclass 330]    330Connected for group operation:
 This subclass is indented under subclass 324.  Apparatus having means connecting them so that they move together as a connected group.

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359+,for moving filter medium types in which the medium is continuous or comprises abutting filtering sections forming in effect a continuous medium except for separating strips or partitions.
  
[List of Patents for class 210 subclass 331]    331Spaced filter wall type, e.g., multiple hollow leaves:
 This subclass is indented under subclass 330.  Apparatus comprising spaced wall type filter elements, e.g., multiple hollow circular leaves.

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327,for alternating moving elements and cleaning means.
486+,for similar elements, per se.
  
[List of Patents for class 210 subclass 332]    332With residue removal or liquid agitation:
 This subclass is indented under subclass 323.  Apparatus in which there is means for removing residue or for agitating the liquid.

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298,for diverse separators having mechanical residue or sediment removers.
407,for a single filter having a residue remover or agitator.
  
[List of Patents for class 210 subclass 333.01]    333.01Backwash of blowback:
 This subclass is indented under subclass 332.  Apparatus having means for causing a reverse flow through the filter medium that is out of service.
  
[List of Patents for class 210 subclass 333.1]    333.1Sequential backwash:
 This subclass is indented under subclass 333.01.  Apparatus having means to successively clean the filter units.
  
[List of Patents for class 210 subclass 334]    334Alternating filter and residue remover:
 This subclass is indented under subclass 332.  Apparatus in which the filter units and cleaning means are arranged in alternation.
  
[List of Patents for class 210 subclass 335]    335In series for prefilt flow:
 This subclass is indented under subclass 323.1.  Apparatus which are in series.

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252+,for serially connected distinct treating units.
300+,for alternate traps and filters in series.
314+,for spaced diverse filters.
489+,for abutted or superimposed members forming a single filter element, arranged for series flow through the members.
  
[List of Patents for class 210 subclass 336]    336Tortuous path:
 This subclass is indented under subclass 335.  Apparatus in which the flow of fluid is in a tortuous or zig-zag path.

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285+,for baffles imbedded in a particulate bed.
  
[List of Patents for class 210 subclass 337]    337Nested units:
 This subclass is indented under subclass 335.  Apparatus arranged in superimposed or nested relation, each unit being removable from the other.

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315,for diverse concentric spaced filters.
342,for concentric filter elements arranged for parallel flow.
  
[List of Patents for class 210 subclass 338]    338Concentric filter elements:
 This subclass is indented under subclass 337.  Apparatus in which the nested units are concentric filter elements.
  
[List of Patents for class 210 subclass 339]    339Internal flange supporting filter element:
 This subclass is indented under subclass 335.  Apparatus comprising a frame or casing having inwardly extending flanges or protuberances supporting the filter elements.

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451+,for a filter element supported within a casing by an internal fixed shoulder.
  
[List of Patents for class 210 subclass 340]    340Parallel filters with flow controller:
 This subclass is indented under subclass 323.1.  Apparatus having means for interrupting flow to at least one filter unit while another remains in service, said filters being in parallel.

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418+,for a single filter with a flow controller.
  
[List of Patents for class 210 subclass 341]    341Individually controlled for removal with common receiver:
 This subclass is indented under subclass 340.  Apparatus in which there is provision for using different filter elements with a common receiver and each filter element has an individual flow control means.

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329,for relatively movable filters which may act to cut off flow.
  
[List of Patents for class 210 subclass 342]    342One element within another:
 This subclass is indented under subclass 323.1.  Apparatus wherein the filter units are arranged one within another.

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315,for spaced diverse filters, one within another.
337+,for nested filter units arranged for series prefilt flow.
  
[List of Patents for class 210 subclass 343]    343Alternating oppositely opening liquid distributors:
 This subclass is indented under subclass 323.1.  Apparatus in which the units alternate with liquid receivers, alternate receivers acting respectively as liquid inlet and discharge means, at least one of a pair of liquid receivers separating one filter medium from another and contacting the separated filter mediums on opposite faces.

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417,for similar devices in which the alternate liquid receivers are located within a continuous body of filter medium.
  
[List of Patents for class 210 subclass 344]    344Abutted alternating medium and pan type receiver:
 This subclass is indented under subclass 323.1.  Apparatus in which each filter unit comprises a filter medium and an imperforate pan-like liquid receiver substantially coextensive with the filter medium.

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224,for a sectional chamber press type filter.
492,for stacked dissimilar elements, the entire stack forming a single unit.
  
[List of Patents for class 210 subclass 345]    345Radial or radially connected to central header:
 This subclass is indented under subclass 323.1.  Apparatus in which the units are radially arranged or which are connected to means extending radially from a central header.
  
[List of Patents for class 210 subclass 346]    346Spaced wall-type filters:
 This subclass is indented under subclass 323.1.  Apparatus in which the units each comprise a filter medium enclosing a space, the filter medium having separate or distinct walls.

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331,for similar structure among movable elements.
486+,for a spaced wall type filter unit.
492,for filter elements divided into alternate prefilt and filtrate spaces by alternately arranged dissimilar elements.
  
[List of Patents for class 210 subclass 347]    347Central header:
 This subclass is indented under subclass 346.  Apparatus in which there is a header extending centrally of the group of spaced wall type filter elements.
  
[List of Patents for class 210 subclass 348]    348FILTER:
 This subclass is indented under the class definition.  Apparatus in which constituents of a prefilt (usually solids and liquid) are separated by passing the prefilt through a medium having openings which retain at least one constituent.

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4Baths, Closets, Sinks, and Spittoons,   subclass 286 for strainers specialized for that class.
55Gas Separation,   appropriate subclasses beginning with subclass 474 for gas filters.
166Wells,   subclasses 227+ for screens peculiar to wells.
209Classifying, Separating, and Assorting Solids,   subclasses 233+ for sifters for solid material.
  
[List of Patents for class 210 subclass 349]    349Pulsation dampener or gas trapping:
 This subclass is indented under subclass 348.  Apparatus provided with means dampening pulsations in liquid flow or for trapping a gas, usually air.

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410,for a device which traps a gas and then releases it to blowback a filter medium.
  
[List of Patents for class 210 subclass 350]    350With movable means to compress medium:
 This subclass is indented under subclass 348.  Apparatus in which a filter medium is enclosed by a receptacle and provided with adjustable or movable means to compress the filtering material.

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226,for a sectional pressure type filter and porous filler.
  
[List of Patents for class 210 subclass 351]    351Actuating means external of closed casing:
 This subclass is indented under subclass 350.  Apparatus including means external of a closed receptacle to actuate or adjust the means which compresses the filter medium.
  
[List of Patents for class 210 subclass 352]    352Internal spring:
 This subclass is indented under subclass 350.  Apparatus wherein the means to compress comprises a spring encased by the receptacle.
  
[List of Patents for class 210 subclass 353]    353Free cleaning means, e.g., loose abrading particles:
 This subclass is indented under subclass 348.  Apparatus in which there is a cleaning means, as loose abrading particles or wiping elements, which are free to move, (not attached to a retaining means).

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263+,for a filter having loose material acting as a filter medium.
  
[List of Patents for class 210 subclass 354]    354Medium, cleaner or agitator moved by fluid:
 This subclass is indented under subclass 348.  Apparatus in which either the filter medium, residue remover or agitator is moved by the fluid being treated.

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97+,for fluid responsive controls, particularly subclasses 121+ for float responsive controls.
242,for a float supported separator.
396+,for a movable medium and solid cleaning member which may be forced against the medium by fluid pressure.
  
[List of Patents for class 210 subclass 355]    355Cleaner:
 This subclass is indented under subclass 354.  Apparatus in which the only element moved by the fluid is a residue remover.
  
[List of Patents for class 210 subclass 356]    356Medium flexed:
 This subclass is indented under subclass 354.  Apparatus in which the filter element is so mounted or specially constructed as to be flexed or compressed by movement of liquid therethrough.

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359+,for means to flex an anchored filter.
391+,for moving filter mediums and blow back means in which flexing may occur incidental to such operation.
  
[List of Patents for class 210 subclass 357]    357Relatively movable members interleaved for cleaning:
 This subclass is indented under subclass 348.  Apparatus in which a cleaning member is extendable between filter mediums or through openings in the filter medium.

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334,for distinct filters alternating with residue removers.
396+,for a movable filter and an adjacent cleaner.
  
[List of Patents for class 210 subclass 358]    358Imperforate drum, medium on arc, chord or end:
 This subclass is indented under subclass 348.  Apparatus in which there is an imperforate drum having a filter element extending across a segment, covering an arc, or covering either or both end walls of the drum.

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399,for another type of movable sealed casing enclosing a filter medium.
  
[List of Patents for class 210 subclass 359]    359Movable medium:
 This subclass is indented under subclass 348.  Apparatus in which the filter medium is capable of movement for treatment purposes.

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107,for flow fluid pressure or material level responsive movement of a filter medium.
122,for float control of a movable separator.
154+,for a flume type movable filter.
178,for a movable separator with a heat exchanger.
189,and 263+, particularly subclasses 267 and 268 for particulate material type separators.
232,for separators combined with handling means.
297,for diverse distinct separators including a movable filter medium.
324+,for plural movable separating elements.
354+,for motion due to flowing fluids.
447,for a closed casing having provision for laterial removal of the filter element.
680+,for processes involving movement of filter medium.
  
[List of Patents for class 210 subclass 360.1]    360.1Centrifugal extractor:
 This subclass is indented under subclass 359.  Apparatus wherein structure including the filter medium is particularly adapted for rapid movement about an axis of rotation.

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144,for a filter automatically controlled in response to vibration.

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34Drying and Gas or Vapor Contact With Solids,   subclass 58 for a centrifugal filter combined with a distinct and separate drying unit or for rotary work holders acting as driers, and see search notes for other devices involving the use of centrifugal force.
57Textiles: Spinning, Twisting, and Twining,   subclasses 76+ for centrifugal pots and guides.
68Textiles: Fluid Treating Apparatus,   subclasses 23+ for washing machines having centrifugal extractor features.
118Coating Apparatus,   subclasses 52+ for centrifugal coating apparatus.
127Sugar, Starch, and Carbohydrates,   subclass 19 for sugar treatment including purging and molding centrifugals.
162Paper Making and Fiber Liberation,   subclass 384 for paper making apparatus utilizing centrifugal force to dewater the slurry on the mold surface.
192Clutches and Power-Stop Control,   subclass 136 for a cover latch control interlocked with driving mechanism for a centrifugal extractor.
494Imperforate Bowl: Centrifugal Separators,   appropriate subclasses, for apparatus for breaking up a mixture of fluids or fluent substances into two or more components by centrifuging within a generally solid-walled, receptacle-like member, and see especially subclass 36 for a separator of that class provided with filtering means.
  
[List of Patents for class 210 subclass 360.2]    360.2With inward flow of feed component:
 This subclass is indented under subclass 360.1.  Apparatus wherein at least a portion of the medium moves in an inward direction.
  
[List of Patents for class 210 subclass 361]    361With individual article container or support:
 This subclass is indented under subclass 360.1.  Apparatus in which means are provided for individually supporting articles for the removal of liquid therefrom, e.g., honey extractors.

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34Drying and Gas or Vapor Contact With Solids,   subclass 58 for centrifugal devices for removing liquid from articles, e.g., honey from combs not having any means for separating by filtration or straining.
  
[List of Patents for class 210 subclass 362]    362Container or support reversible:
 This subclass is indented under subclass 361.  Apparatus in which the position of the article supporting means is reversible relative to the axis of rotation to alternaterly present opposite sides of the article away from such axis.
  
[List of Patents for class 210 subclass 363]    363With adjustable rotation stabilizer:
 This subclass is indented under subclass 360.1.  Apparatus wherein adjustable means is provided to position the center of gravity of the structure on the geometric axis of rotation.

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145+,for variable rotation condition responsive control.

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74Machine Element or Mechanism,   subclasses 572+ for flywheels or rotors with balancing or vibration dampening means defining no features of separator construction.
  
[List of Patents for class 210 subclass 364]    364Casing, shaft and filter unit gyratorily mounted:
 This subclass is indented under subclass 360.1.  Apparatus wherein the filter medium is mounted on a shaft and is enclosed by a nonrotating casing, both the rotating structure and casing being mounted for gyratory movement as a unit.

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248Supports,   subclasses 637+ for machinery supports.
  
[List of Patents for class 210 subclass 365]    365Shaft and filter unit gyratorily mounted:
 This subclass is indented under subclass 360.1.  Apparatus wherein the filter medium is mounted upon a rotating shaft, both the filter medium and shaft being mounted for gyratory movement as a unit.
  
[List of Patents for class 210 subclass 366]    366Gyratory mounting above filter:
 This subclass is indented under subclass 365.  Apparatus wherein the mounting is above the filter medium.
  
[List of Patents for class 210 subclass 367]    367Filter gyratorily mounted on shaft:
 This subclass is indented under subclass 360.1.  Apparatus wherein the filter medium is gyratorily supported.

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325,for plural centrifugal extractors with planetary motion.
  
[List of Patents for class 210 subclass 368]    368With rotation brake:
 This subclass is indented under subclass 360.1.  Apparatus with means for slowing or stopping rotation.

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192Clutches and Power-Stop Control,   subclasses 215+ for brake and power transmission control of general utility.
  
[List of Patents for class 210 subclass 369]    369Discharging residue:
 This subclass is indented under subclass 360.1.  Apparatus including structure to discharge residue.
  
[List of Patents for class 210 subclass 370]    370Secondary motion of filter medium:
 This subclass is indented under subclass 369.  Apparatus comprising means giving the filter medium, in whole or in part, an additional motion.

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232+,for means assembling and disassembling a filter, particularly subclasses 237+ for a filter with hoist or handle means.
  
[List of Patents for class 210 subclass 371]    371With variable flow controller:
 This subclass is indented under subclass 369.  Apparatus comprising a variable controller for flow of residue.

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418+,for fixed filter and flow controller and see the search notes thereunder.
  
[List of Patents for class 210 subclass 372]    372By residue engaging means:
 This subclass is indented under subclass 369.  Apparatus in which discharge of the residue is effected or controlled by means engaging it, e.g., doctor blades.

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15Brushing, Scrubbing, and General Cleaning,   subclass 256.5 for a moving surface scraper, wiper or brush of general application.
  
[List of Patents for class 210 subclass 373]    373Fixed:
 This subclass is indented under subclass 372.  Apparatus in which the residue engaging means is stationarily mounted.
  
[List of Patents for class 210 subclass 374]    374Rotatable:
 This subclass is indented under subclass 372.  Apparatus in which the residue engaging means is rotatably mounted with respect to the filter medium.
  
[List of Patents for class 210 subclass 375]    375Pivoted:
 This subclass is indented under subclass 374.  Apparatus in which the residue engaging means is pivotably mounted.
  
[List of Patents for class 210 subclass 376]    376Axially reciprocable:
 This subclass is indented under subclass 372.  Apparatus in which the residue engaging means is axially reciprocable parallel to the axis of rotation.
  
[List of Patents for class 210 subclass 377]    377Internal work distributor:
 This subclass is indented under subclass 360.1.  Apparatus within the rotating filter medium for distributing the incoming material feed.

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213,and 214, for a moving filter element having a movable distributor for introducing a treating material to the interior thereof.
  
[List of Patents for class 210 subclass 378]    378Including filtrate receiving means having plural filtrate outlets:
 This subclass is indented under subclass 360.1.  Apparatus including filtrate receiving means provided with a plurality of separate outlets.

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215,for similar structure having means to add a treating material within the separator.
  
[List of Patents for class 210 subclass 379]    379Including filtrate receiving trough adjacent top discharge:
 This subclass is indented under subclass 360.1.  Apparatus in which the separating structure rotates about an upright axis and in which the filtrate discharge therefrom is restricted to a zone at or adjacent the top thereof, combined with a filtrate receiving trough disposed above the bottom of the rotating structure and surrounding the filtrate discharge.
  
[List of Patents for class 210 subclass 380.1]    380.1Rotating element construction:
 This subclass is indented under subclass 360.1.  Apparatus comprising the rotating separator structure, per se.

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369+,for a tapered basket for discharging residue.
483+,particularly subclass 497 for a cylindrical or conical filter medium of general application.

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220Receptacles,   subclasses 200+ for a container cover in which no special features peculiar to rotatable extractor operation are defined.
  
[List of Patents for class 210 subclass 380.2]    380.2Laundry:
 This subclass is indented under subclass 380.1.  Apparatus for washing or drying clothes.
  
[List of Patents for class 210 subclass 380.3]    380.3Horizontal axis:
 This subclass is indented under subclass 380.1.  Apparatus which rotates around horizontal axis.
  
[List of Patents for class 210 subclass 381]    381Inwardly extending partitions:
 This subclass is indented under subclass 380.1.  Apparatus including inwardly extending partitions dividing the interior of the separating structure into compartments.

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34Drying and Gas or Vapor Contact With Solids,   subclass 109 for a compartmented drier drum.
68Textiles: Fluid Treating Apparatus,   subclass 143 for a compartmented tumbling and washing drum.
  
[List of Patents for class 210 subclass 382]    382Top filtrate discharge:
 This subclass is indented under subclass 380.1.  Apparatus in which the separating structure rotates about an upright axis, and its filtrate discharge is restricted to a zone at or adjacent the top.

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246,for a portable receptacle having a cover limited as to its opening movement.
379,for a filtrate receiving trough at or adjacent the top of the separating structure.
  
[List of Patents for class 210 subclass 383]    383Separate agitator:
 This subclass is indented under subclass 359.  Apparatus having separate agitating means.

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167.01through 167.32, for a structural installation with a closed circulating system.
194+,for recirculation means.
407,for a fixed filter medium and an agitator or a cleaner, and see the search notes thereto.
  
[List of Patents for class 210 subclass 384]    384Vibrator and unidirectional motion filter medium:
 This subclass is indented under subclass 359.  Apparatus comprising means for vibrating the filter medium which is moving continuously in one direction, e.g., belt or drum.

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388,for other types of vibrating movable filters.
  
[List of Patents for class 210 subclass 385]    385With plural motion:
 This subclass is indented under subclass 359.  Apparatus in which the filter unit has more than one motion, e.g., rotation and translation or rotation on plural axes.

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323+,for plural movable filter elements which may have plural motions.
370,for a centrifugal extractor having plural motions of the filter medium.
384,for a unidirectional motion filter and vibrator for the medium.
  
[List of Patents for class 210 subclass 386]    386Rolls or confining members contacting residue:
 This subclass is indented under subclass 359.  Apparatus in which there are rolls or confining members which contact the residue on the moving medium, e.g., for compacting, shielding or takeoff.

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401,for a belt type filter superimposed on a moving support.
402+,for a drum filter.
  
[List of Patents for class 210 subclass 387]    387Unrollable:
 This subclass is indented under subclass 359.  Apparatus unrollable from a spool or equivalent source so as to present successive areas for the filtering operation.
  
[List of Patents for class 210 subclass 388]    388Vibrating or longitudinally reciprocating:
 This subclass is indented under subclass 359.  Apparatus in which the filter medium vibrates or has motion back and forth in a plane parallel to the surface of the filtering medium during filtration.

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354,for a filter medium flexed by fluid flow.
384,for a vibrator acting on a unidirectional motion filter medium.
385,for a filter having plural motions.

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209Classifying, Separating, and Assorting Solids,   subclasses 325+ , 331, 333+, and 341 for shaking sifters for solids, and subclasses 437+ for reciprocating liquid treatment stratifiers.
  
[List of Patents for class 210 subclass 389]    389Longitudinally moving prefilt type:
 This subclass is indented under subclass 388.  Apparatus in which the prefilt is fed in at one point of a filter medium, usually one end, and moves along it.
  
[List of Patents for class 210 subclass 390]    390Mounted on movable valve element:
 This subclass is indented under subclass 359.  Apparatus supported by a movable valve part.

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385,for a filter element having at least two motions.
395,for a moving filter with cleaning means so connected to a valve that movement of the medium actuates the valve.

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137Fluid Handling,   subclasses 547+ for a movable strainer for gas separation combined with flow control means.
  
[List of Patents for class 210 subclass 391]    391With cleaning means:
 This subclass is indented under subclass 359.  Apparatus having means for removing residue.

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107,for flow, fluid pressure or material level responsive cleaning movement of a filter medium.
158,for a movable flume stream type strainer with cleaning means.
216+,for moving filter medium and means for adding a treating material.
369+,for a centrifugal extractor with residue removing means.
386,for rolls or confining members which may act as residue removers.
399,for a movable casing which may clean by merely reversing the casing position.
407,for residue remover for a fixed filter medium and see the search notes.

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162Paper Making and Fiber Liberation,   subclasses 274+ for paper making apparatus having means to clean or condition a porous or foraminous member.
  
[List of Patents for class 210 subclass 392]    392Fixed position or attached valve blocking means:
 This subclass is indented under subclass 391.  Apparatus having (1) a member fixed in position which contacts the filter medium or its support, or (2) a member actuating valves attached to a moving filter medium or its support; either (1) or (2) acting to block fluid flow through part of the moving filter medium.
  
[List of Patents for class 210 subclass 393]    393Backwash or blowback and additional cleaner:
 This subclass is indented under subclass 391.  Apparatus having blowback or backwash cleaning means and another cleaning means, e.g., scraper or brush.
  
[List of Patents for class 210 subclass 394]    394Discharging inside, e.g., internal-type drum:
 This subclass is indented under subclass 391.  Apparatus in which the moving filter medium encloses a space and the cleaning means acts to return residue to said space.

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194+,for recirculation.
403,for an internal feed type rotary drum filter without cleaning means.
  
[List of Patents for class 210 subclass 395]    395With filter-driven valve means:
 This subclass is indented under subclass 391.  Apparatus in which flow of fluids is controlled by valve means actuated by the moving medium.

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142,for valves connected to a moving filter medium in combination with programming means.
390,for filter medium supported by and movable with a valve member.
392,for a fixed member operating valves attached to a moving filter unit.
  
[List of Patents for class 210 subclass 396]    396Solid cleaner, e.g., scraper:
 This subclass is indented under subclass 391.  Apparatus comprising a scraper, wiper, abrader, cutter, brush or similar solid member.

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372,for a centrifugal extractor with a residue engaging means.
393,for a scraper, cutter or brush combined with backwash or blowback.

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15Brushing, Scrubbing, and General Cleaning,   subclass 256.5 for moving surface scrapers of general application.
  
[List of Patents for class 210 subclass 397]    397With plural outlets from filter casing:
 This subclass is indented under subclass 396.  Apparatus having plural outlets from a casing for the medium.

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433,for divided filtered and unfiltered liquid passages and see notes thereunder.
  
[List of Patents for class 210 subclass 398]    398Within sealed enclosure:
 This subclass is indented under subclass 359.  Apparatus within a casing sealed except for necessary fluid inlet or outlet.

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267,for a trunnion mounted particulate material type separator.
358,for an imperforate drum with the medium on an arc, chord or end wall.
  
[List of Patents for class 210 subclass 399]    399Movable casing:
 This subclass is indented under subclass 398.  Apparatus in which the closed casing is mounted for motion.

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390,for a filter medium or casing attached to a movable valve element.

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422Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,   subclasses 258+ and 269+ for rotary extractor or leacher.
  
[List of Patents for class 210 subclass 400]    400Belt type:
 This subclass is indented under subclass 359.  Apparatus comprising a closed loop or filter elements attached to a closed loop carrier.

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160,for a flume stream type endless belt filter.
370,for an endless belt type filter element forming the wall of a centrifugal extractor.

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162Paper Making and Fiber Liberation,   subclasses 348+ for flexible endless band type mold paper making machines (e.g., Fourdrinier machines).
209Classifying, Separating, and Assorting Solids,   subclasses 307+ for endless belt sifters for solids.
  
[List of Patents for class 210 subclass 401]    401Superimposed on additional moving support:
 This subclass is indented under subclass 400.  Apparatus supported on an additional moving means.

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386,for running strand residue removers.
  
[List of Patents for class 210 subclass 402]    402Drum type:
 This subclass is indented under subclass 359.  Apparatus in the shape of a drum.

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161,for a revolving flume stream type filter.
174,for a movable cylindrical filter having comminuting means.
210+,and 217, for a drum type separator having means to add a treating material.
326,for plural drums on parallel axes.

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162Paper Making and Fiber Liberation,   subclasses 323+ and 357 for cylinder mold type paper making machines.
  
[List of Patents for class 210 subclass 403]    403Internal feed:
 This subclass is indented under subclass 402.  Apparatus in which prefilt enters the inside of the rotating filter.

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394,for an internally fed rotary drum with cleaning means.

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209Classifying, Separating, and Assorting Solids,   subclasses 288+ for rotating drum sifters for solids.
  
[List of Patents for class 210 subclass 404]    404Annular segmented compartment:
 This subclass is indented under subclass 402.  Apparatus comprising an inner wall surrounded by a filter element forming an annular space divided into segments by partitions.
  
[List of Patents for class 210 subclass 405]    405Movable prefilt distributor:
 This subclass is indented under subclass 348.  Apparatus having moving means which receives and distributes the prefilt against a filter medium, e.g., rotary thrower.

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377,for an internal work distributor for a centrifugal extractor.
456,for a fixed prefilt flow distributor and diverter.
  
[List of Patents for class 210 subclass 406]    406Vacuumized filtrate receiver:
 This subclass is indented under subclass 348.  Apparatus in which there is means to apply a vacuum to a closed filtrate receiver with no liquid being removed to the vacuum source.

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416,for liquid pump, gas pressure or liquid suction source combinations.
459+,for a pipe end attached filter which pipe may be a suction pipe.
481,for a filter element of the type often used with a reflux or vacuum coffee maker.
  
[List of Patents for class 210 subclass 407]    407With residue removing means or agitation of liquid:
 This subclass is indented under subclass 348.  Apparatus having means for removing residue from the filter medium or for agitating either the prefilt or filtrate.

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106+,for automatic filter cleaning.
159,for means to remove residue from a cleaner for a flume stream strainer.
179,for a mechanical agitator in a heat exchanger.
208,for a mechanical agitator in a reactor tank.
219,for a mechanical agitator and means to add treating material.
225,for similar structure in a sectional chamber press filter.
251,for means for cleaning the outer casing of a separator.
269+,for rehabilitation means for a particulate bed separator.
298,for diverse separators having residue removing means.
319,for diverse separators having agitating means.
332+,for plural separators with residue removal.
353,for a filter with free cleaning means.
345+,for movement of the medium, cleaner or agitator by fluid.
791,for processes of rehabilitating filter mediums.
  
[List of Patents for class 210 subclass 408]    408Diverse, e.g., combined agitators, scrapers, aeration blowback:
 This subclass is indented under subclass 407.  Apparatus provided with diverse residue removal or agitating means, e.g., agitators, scrapers, brushes, means to add a gas, means to blowback through the filter medium.

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209Classifying, Separating, and Assorting Solids,   subclasses 379+ for sifting screen cleaners.
  
[List of Patents for class 210 subclass 409]    409Fluid cleaning:
 This subclass is indented under subclass 407.  Apparatus having (1) means to add a fluid to or trap a fluid within the filter unit for cleaning purposes or (2) constructed to backwash the filter medium.

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433,for a bypass around a filter including those whereby a filter is cleaned by prefilt flow.
  
[List of Patents for class 210 subclass 410]    410Air pump type:
 This subclass is indented under subclass 409.  Apparatus in which a fluid is trapped within the filter, which fluid, upon a release of pressure or cessation of normal flow, acts to force itself or a portion of the filtrate through the filter medium or acts to discharge trapped residue.
  
[List of Patents for class 210 subclass 411]    411Backwash or blowback:
 This subclass is indented under subclass 409.  Apparatus having means to pass a fluid, usually a liquid, through the filter medium in a direction reverse to normal filtering flow.

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427,for a flow controller for backwash and see the search notes thereunder.
678,793, and 798, for processes of rehabilitating a separation medium by reverse flow.
  
[List of Patents for class 210 subclass 412]    412Liquid pulsator:
 This subclass is indented under subclass 411.  Apparatus having means to cause a backwash liquid, usually filtrate, to traverse the filter medium as a pressure wave, i.e., having pressures varying between two or more peaks, e.g., pistons reciprocating within a cylindrical filter medium or an intermittently actuated pulsator.

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349,for a filter having pulsation dampeners or gas trapping means.
356,for a filter constructed to cause flexing of the medium by a fluid.
359,for a filter having mechanical means for flexing the medium.
384,and 388+, for a filter having vibrating means.
  
[List of Patents for class 210 subclass 413]    413Fixed filter medium and movable stirrer or cleaner:
 This subclass is indented under subclass 407.  Apparatus in which the filter medium is stationary and an agitator and mechanical cleaning means moves relative to it.

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357,for a filter having interleaved members for cleaning.

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15Brushing, Scrubbing, and General Cleaning,   subclasses 246+ for cleaning attachments there provided for.
  
[List of Patents for class 210 subclass 414]    414With plural outlets from filter casing:
 This subclass is indented under subclass 413.  Apparatus in which the fixed filter medium is mounted within a closed casing having plural outlets.

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397,422+ and 433, for other filter combinations having plural outlets from a closed casing.
  
[List of Patents for class 210 subclass 415]    415Nontranslatory rotary:
 This subclass is indented under subclass 413.  Apparatus in which the filter medium has a curved surface and in which the cleaning or agitating means moves about a fixed axis and has nontranslatory rotary motion.
  
[List of Patents for class 210 subclass 416.1]    416.1With pump, gas pressure, or suction source:
 This subclass is indented under subclass 348.  Apparatus provided with a pump or other source of vacuum or pressure which is particularly defined as other than a suction of pressure conduit, acting to aid the flow of fluid through the strainer or filter.

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167.01through 167.32 , for a structural installation with a closed circulating system.
194+,for recirculation which may include a pump.
251,for a filter combined with a mouthpiece.
258,for serially connected units including a pump.
406,for a filter combined with a vacuum source which does not pump the liquid.
412,for a liquid pulsator acting during backwash of blowback.

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92Expansible Chamber Devices,   subclasses 78+ for the combination of an expansible chamber device and fluid purifying means which enhances the operation of the device; and see (2) Note in subclass 78 of Class 92 for statement of the line.
166Wells,   subclasses 105.1+ for well pumps having sediment traps or deflectors; and subclasses 105.5+ for well pumps having liquid-gas separator; i.e., gas anchors.
417Pumps,   appropriate subclasses for the combination of a pump and a filter wherein the specific disclosure of the filter is to protect or enhance the operation of the pump.
418Rotary Expansible Chamber Devices,   subclass 47 for the combination or a rotary expansible chamber pump and a filter wherein the filter is specially disclosed as protecting or enhancing the operation of the pump.
  
[List of Patents for class 210 subclass 416.2]    416.2For aquarium or swimming pool:
 This subclass is indented under subclass 416.1.  Apparatus adapted for use in an aquarium or swimming pool.

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167.1through 167.2, for a closed circulating system for a swimming pool or spa.
167.21through 167.27, for a closed circulating system for an aquarium.
  
[List of Patents for class 210 subclass 416.3]    416.3For drinking water:
 This subclass is indented under subclass 416.1.  Apparatus used to produce drinking water.
  
[List of Patents for class 210 subclass 416.4]    416.4For fuel system:
 This subclass is indented under subclass 416.1.  Apparatus used in a fuel system.
  
[List of Patents for class 210 subclass 416.5]    416.5For lubricating or oil treating system:
 This subclass is indented under subclass 416.1.  Apparatus adapted for use in a lubricating or oil treating system.

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167.02through 167.09 , for a closed circulating system for a lubrication system.
  
[List of Patents for class 210 subclass 417]    417Alternating oppositely opening liquid distributors:
 This subclass is indented under subclass 348.  Apparatus in which there are liquid distributors embedded in a filter medium, alternate distributors acting respectively as liquid inlet and discharge means.

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343,for similar devices in which the filter elements form plural units.
  
[List of Patents for class 210 subclass 418]    418With flow controller for material being treated:
 This subclass is indented under subclass 348.  Apparatus with a variable flow controller for the material being treated, or a constituent thereof.

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97+,for flow, fluid pressure or material level responsive means.
138+,for a separator with time control means.
141+,for a separator with a program actuator.
143+,for automatic control of a separator.
302,for a filter and a constituent trap with a flow line valve.
313,for a filter, a constituent trap and valve controlled sediment discharge means.
340,for parallel similar filters with flow control means.
371,for a variable flow controller for residue in a centrifugal extractor.
390,for a movable medium mounted on a movable valve element.

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137Fluid Handling,   subclasses 544+ for a flow controller combined with a gas separator.
138Pipes and Tubular Conduits,   subclass 41 for a restrictor and a screen.
166Wells,   subclass 205 for a well screen with a valve or changeable restrictor.
  
[List of Patents for class 210 subclass 419]    419Attached to or within portable prefilt receiver:
 This subclass is indented under subclass 418.  Apparatus in which the flow controller is attached to or within a portable prefilt receiver, e.g., funnel or hand manipulated receptacle.

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244+,for a portable receptacle with hood or closure.
  
[List of Patents for class 210 subclass 420]    420Selective directive flow relative to filter:
 This subclass is indented under subclass 418.  Apparatus in which the controller selects the direction of fluid flow from a given source through or by the filter.

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130+,for a fluid pressure responsive bypass.
190+,and 269+, for valve controlled means for bypassing a water softening apparatus during regeneration thereof.
  
[List of Patents for class 210 subclass 421]    421Pivoted prefilt deflector:
 This subclass is indented under subclass 420.  Apparatus in which a deflector is pivoted for limited motion for diverting the prefilt to one or more alternate paths, e.g., dirty rain to a receiver and clean rain water to a filter.

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99,for a similar organization having means responsive to prefilt accumulation.
  
[List of Patents for class 210 subclass 422]    422Plural outlets from filter casing:
 This subclass is indented under subclass 420.  Apparatus in which the filter element is within a closed casing, which casing has a residue or prefilt outlet in addition to a prefilt inlet and filtrate outlet.

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299+,particularly subclasses 312+ for a filter combined with a constituent trapping feature and sediment discharge means.
  
[List of Patents for class 210 subclass 423]    423Attached unitary plural passage header:
 This subclass is indented under subclass 422.  Apparatus having at least one inlet and one outlet in a unitary header.

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133,for a fluid pressure responsive bypass in a unitary header.
340,for parallel filters with flow control means.
  
[List of Patents for class 210 subclass 424]    424Multi-way valve:
 This subclass is indented under subclass 420.  Apparatus including a multiway valve which may be adjusted to direct flow in different directions.
  
[List of Patents for class 210 subclass 425]    425Backwash:
 This subclass is indented under subclass 424.  Apparatus to control backwash.

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278+,for a multiway valve unit controlling backwash in a particulate material type separator.
  
[List of Patents for class 210 subclass 426]    426Encased:
 This subclass is indented under subclass 425.  Apparatus wherein the valve is within the same housing as the filter.
  
[List of Patents for class 210 subclass 427]    427Backwash:
 This subclass is indented under subclass 420.  Apparatus to control backwash.

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108,for flow, fluid pressure or material level control of backwash.
190+,for external regenerating medium supply combinations.
425+,for control of backwash by a selective directive multiway valve controller.
  
[List of Patents for class 210 subclass 428]    428Combining or dividing flow passages with filter in combined passage:
 This subclass is indented under subclass 418.  Apparatus in which there are at least two inflow passages and one outflow passage with the filter in the outflow or (2) at least two outflow passages and one inflow passage with the filter in the inflow; and with a flow controller for any one or more of said passages.

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378+,for a centrifugal extractor having plural filtrate outlets.
  
[List of Patents for class 210 subclass 429]    429Filter coaxial with valve seat or valve stem:
 This subclass is indented under subclass 418.  Apparatus in which the seat or the stem of the flow controller is coaxial with the filter.
  
[List of Patents for class 210 subclass 430]    430Filter surrounds valve:
 This subclass is indented under subclass 429.  Apparatus in which the filter surrounds the controller seat or head.

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371,for a centrifugal basket having valve means coacting with the bottom of the basket.
426,for a multiway valve unit encased in a filter housing for controlling cleaning by a backwash fluid.
  
[List of Patents for class 210 subclass 431]    431Filter fixed to valve seat, opposed to valve head:
 This subclass is indented under subclass 429.  Apparatus in which the filter is fixed to the controller seat opposite the controller head.
  
[List of Patents for class 210 subclass 432]    432Filter in valve body recess:
 This subclass is indented under subclass 418.  Apparatus in which the filter is in a chamber or recess in the controller body.

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426,for an encased multiway valve unit to control fluid cleaning of a filter by backwashing.
  
[List of Patents for class 210 subclass 433.1]    433.1Divided filtered, and unfiltered liquid outlet passages:
 This subclass is indented under subclass 348.  Apparatus comprising two outlet passages for liquid under treatment, one for untreated liquid and one for filtrate.

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130+,for a pressure-responsive bypass.
254,for serially connected units with a bypass.
321.6+,for devices having plural inlets and outlets in which the medium is a dialyzing membrane.
385,for axially reciprocable and rotary filter medium which may act as a bypass.
420+,for a variable directive flow controller.
428,for combining and dividing flow passages with a filter in the combined passage.
436,and 472, for a vended filter.
  
[List of Patents for class 210 subclass 434]    434Recombining:
 This subclass is indented under subclass 433.1.  Apparatus in which the untreated part joins the filtrate.
  
[List of Patents for class 210 subclass 435]    435Within flow line or flow line connected close casing:
 This subclass is indented under subclass 348.  Apparatus wherein the filter medium is totally positioned in a casing which is imperforate except for flow line means for introducing and discharging fluid.

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287+,for similar structure for a particulate bed.
459+,for filters attached to a plate or the end of a pipe.
473+,for filter and receptacle combinations in which part of the receptacle may resemble a pipe, e.g., funnel neck.

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68Textiles: Fluid Treating Apparatus,   subclass 208 for fluid textile treating apparatus having a drain and strainer means associated therewith.
  
[List of Patents for class 210 subclass 436]    436Vented:
 This subclass is indented under subclass 435.  Apparatus wherein means for venting the casing is provided.
  
[List of Patents for class 210 subclass 437]    437Central internal liquid receiver, e.g., tube:
 This subclass is indented under subclass 435.  Apparatus in which a liquid receiving means such as a tube or equivalent means forming a flow passage is located centrally of a filter medium or element.
  
[List of Patents for class 210 subclass 438]    438Imperforate central liquid tube:
 This subclass is indented under subclass 437.  Apparatus in which the tube is imperforate at least along a substantial length thereof directing fluid axially of the filter element.
  
[List of Patents for class 210 subclass 439]    439Axial flow through filter element:
 This subclass is indented under subclass 438.  Apparatus in which the liquid to be treated flows through the imperforate tube in one direction and through the filter medium, for treating purposes, in a direction opposite to the first mentioned direction of flow.

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288,for a particulate material type separator having similar structure.
  
[List of Patents for class 210 subclass 440]    440Inlet and outlet at same end:
 This subclass is indented under subclass 437.  Apparatus in which the prefilt inlet and the filtrate outlet are in the same end of a closed casing.
  
[List of Patents for class 210 subclass 441]    441Attached to casing:
 This subclass is indented under subclass 437.  Apparatus in which the central liquid receiving means is directly attached to a part of the casing.
  
[List of Patents for class 210 subclass 442]    442Head and base connected:
 This subclass is indented under subclass 441.  Apparatus in which the central liquid receiving means is attached, at each of its ends, to opposed parts of the casing.
  
[List of Patents for class 210 subclass 443]    443Inlet and outlet at same end:
 This subclass is indented under subclass 435.  Apparatus in which the prefilt inlet and the filtrate outlet are in the same end of a closed casing.

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133,for fluid pressure responsive bypass in an inlet and outlet closure header.
420+,particularly subclass 423 for flow controller combinations with a prefilt inlet and outlet at the same end of the casing.
440,for similar structure with a central liquid receiver.
  
[List of Patents for class 210 subclass 444]    444Filter suspended from head:
 This subclass is indented under subclass 443.  Apparatus in which the filter element is attached to and extrudes downwardly from an upper part of the casing, usually a removable head.
  
[List of Patents for class 210 subclass 445]    445Clamped in casing joint:
 This subclass is indented under subclass 435.  Apparatus in which the filter medium is clamped in a joint of the casing.

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227+,for sectional pressure type filters in which the medium is clamped in a casing joint.
  
[List of Patents for class 210 subclass 446]    446Axially aligned inlet and outlet:
 This subclass is indented under subclass 435.  Apparatus in which the prefilt inlet and the filtrate outlet are in substantial axial alignment.
  
[List of Patents for class 210 subclass 447]    447Laterally removable:
 This subclass is indented under subclass 446.  Apparatus in which the strainer or filter element is insertable in and removable from the casing by movement generally lateral to the direction of flow of the liquid to be treated, e.g., the axis of the casing or pipe.

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310,for a filter and a constituent trap in which the trap is lateral of a flow line.
454,for a filter element attached to a closure.
  
[List of Patents for class 210 subclass 448]    448Single open-end-type filter element:
 This subclass is indented under subclass 446.  Apparatus in which the filter element is a hollow filter element having one end open.

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452,for a single open end type filter supported on an internal fixed shoulder.
  
[List of Patents for class 210 subclass 449]    449Pipe end attached closed casing, e.g., faucet:
 This subclass is indented under subclass 446.  Apparatus in which the closed casing is attached to and extends beyond the end of a pipe.

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459+,for a similar filter not enclosed in a casing.

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137Fluid Handling,   subclasses 549+ for a flow controller combined with gas separating means.
  
[List of Patents for class 210 subclass 450]    450Gasket within casing or spaced removable end members:
 This subclass is indented under subclass 435.  Apparatus having (1) opposed members at each end of the element which are separable from the casing with the filter element supported between them, or (2) a gasket between the element and the walls of the casing.

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445,for a filter element clamped in a casing joint which may include a gasket.
  
[List of Patents for class 210 subclass 451]    451Internal fixed shoulder supporting filter element:
 This subclass is indented under subclass 435.  Apparatus in which the casing is provided with an internal shoulder from which the filter element is supported.

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477,for a filter resting on an internal stop or surface of a receiver of more general construction.
  
[List of Patents for class 210 subclass 452]    452Single open-end-type filter element:
 This subclass is indented under subclass 451.  Apparatus in which the filter element is a hollow filter element having a single open end.

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448,for an axially aligned inlet and outlet to a casing enclosing a single open end filter element.
  
[List of Patents for class 210 subclass 453]    453