Manual of U.S. Patent Classification
as of June 30, 2000

Class
210
LIQUID PURIFICATION OR SEPARATION

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Subclass definitions may be accessed by clicking on the subclass number, below.

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Subclass		Title
ClassTitle		===> LIQUID PURIFICATION OR SEPARATION
600		PROCESSES
601		. Treatment by living organism
602		. . Including plant or animal of higher order
603		. . Including collecting or storing gas (e.g., fuel, carbon monoxide, etc.)
604		. . . And reusing oxidant
605		. . Anaerobically, with subsequently aerobically treating liquid
606		. . Adding enzyme or releasing same by treating microorganism
607		. . Dividing, treating, and recombining liquid
608		. . Regulating floating constituent
609		. . Including dewatering sludge
610		. . Including adding ancillary growth medium for microorganism
611		. . . For or with specific microorganism
612		. . And regulating temperature during biological step
613		. . . Digesting sludge
614		. . Controlling process in response to stream constituent or reactant concentration
615		. . Utilizing contact surfaces supporting microorganism (e.g., trickling filter, etc.)
616		. . . Particulate media
617		. . . . In bed form
618		. . . . . And rehabilitating or regenerating same
619		. . . Rotating contactor
620		. . Aerobic treatment
621		. . . Recirculating to prior step
622		. . . . Of separated liquid
623		. . . . Of sludge or separated solid
624		. . . . . And returning to or withdrawing from diverse treating zones
625		. . . . . Treating outside mainstream
626		. . . . . To mainstream oxygenation (e.g., activated sludge, etc.)
627		. . . . . . Utilizing specific oxidant, other than air alone (e.g., oxygen-enriched air, ozone, peroxide, etc.)
628		. . . . . . Utilizing mechanical aeration means
629		. . . And internally circulating the liquid
630		. . . And anaerobic treatment
631		. . And additional treating agent other than mere mechanical manipulation (e.g., chemical, sorption, etc.)
632		. Treating by enzyme
633		. Extracting utilizing solid solute
634		. Liquid/liquid solvent or colloidal extraction or diffusing or passing through septum selective as to material of a component of liquid; such diffusing or passing being effected by other than only an ion exchange or sorption process
635		. . Liquid/liquid or gel type (i.e., jellylike) chromatography
636		. . Including cleaning or sterilizing of apparatus
637		. . Including regulating pressure to control constituent gradient at membrane or to prevent rupture of membrane
638		. . Including ion exchange or other chemical reaction
639		. . Including prior use of additive (e.g., changing pH, etc.)
640		. . Passing through membrane in vapor phase
641		. . Utilizing plural diverse membranes
642		. . Extracting water from brine utilizing liquid/liquid solvent or colloidal extraction
643		. . Utilizing liquid membrane (e.g., emulsion) in liquid/liquid solvent or colloidal extraction
644		. . Diffusing or passing through septum selective as to material of a component in liquid/liquid solvent or colloidal extraction
645		. . . Biological fluid (e.g., blood, urine, etc.)
646		. . . . Hemodialysis
647		. . . . . Maintaining critical concentration(s)
648		. . . Including regenerating or rehabilitating the extracting liquid in liquid/liquid solvent or colloidal extraction
649		. . Diffusing or passing through septum selective as to material of a component of liquid
650		. . . Filtering through membrane (e.g., ultrafiltration)
651		. . . . Removing specified material
652		. . . . Hyperfiltration (e.g., reverse osmosis, etc.)
653		. . . . . Utilizing specified membrane material
654		. . . . . . Synthetic resin
655		. . . . . . Cellulosic
656		. Chromatography
657		. . Utilizing rotating column
658		. . Utilizing paper or thin layer plate
659		. . Including liquid flow diversion
660		. Ion exchange or selective sorption
661		. . By passing through suspended bed
662		. . And liquid testing or volume measuring
663		. . Including diverse separating or treating of liquid
664		. . . By distilling or degassing
665		. . . By making an insoluble substance or accreting suspended constituents
666		. . . . Utilizing organic agent
667		. . . . Utilizing aluminum, calcium, or iron containing agent
668		. . . By chemically modifying or inhibiting dispersed constituent
669		. . . Prior to ion exchange or sorption
670		. . Including rehabilitating or regenerating exchange material or sorbent
671		. . . Of oil sorbent material
672		. . . Fractional, selective, or partial type
673		. . . Utilizing gas, water, or chemical oxidizing or reducing agent
674		. . . Utilizing organic regenerant
675		. . . Rehabilitating or regenerating in diverse zone or chamber
676		. . . . Continuous cyclic process
677		. . . Using conserved or recirculated fluid
678		. . . Including liquid flow direction change
679		. . Utilizing exchange or sorbent material associated with inert material
680		. . . Including oil sorbent
681		. . Removing ions
682		. . . Radioactive
683		. . . Anions
684		. . . . Metal complexed (e.g., chromate, ferricyanide, chlorplatinate, etc.)
685		. . . . Including cation
686		. . . . . Utilizing mixed bed or amphoteric material
687		. . . Calcium or magnesium (e.g., hardness, water softening, etc.)
688		. . . Heavy metal
689		. . Sorbing water from diverse liquid
690		. . Sorbing organic constituent
691		. . . From aqueous material
692		. . . . Utilizing synthetic resin
693		. . . . . Oil removed
694		. . . . Utilizing activated carbon
695		. Using magnetic force
696		. Preventing, decreasing, or delaying precipitation, coagulation or flocculation
697		. . Utilizing inorganic phosphorus agent
698		. . Utilizing organic agent
699		. . . Phosphorus containing
700		. . . . Nitrogen containing
701		. . . Acrylic polymer
702		. Making an insoluble substance or accreting suspended constituents
703		. . Effecting flotation
704		. . . Including chemical addition (with or without bouyancy gas)
705		. . . . Chemically specified precipitant, coagulant, or flocculant
706		. . . . . And significant characteristic of the bouyancy gas, other than mere addition of same
707		. . . . . . Generating gas in situ
708		. . Including emulsion breaking
709		. . Controlling process in response to stream condition
710		. . Treating the insoluble substance
711		. . . For recovery of a treating agent
712		. . Including recycling
713		. . . Of separated solids
714		. . Seeding
715		. . . Utilizing sludge or floc blanket
716		. . Including step of manufacturing inorganic treating agent
717		. . . In situ
718		. . Including degassing
719		. . Including chemical reduction
720		. . . Of chromium material
721		. . Including oxidation
722		. . . Of iron or manganese material
723		. . Utilizing precipitant, flocculant, or coagulant, each with accelerator or with each other or plural precipitants, flocculants, or coagulants
724		. . . Regulating pH
725		. . . . Utilizing organic precipitant
726		. . . Sequential introduction
727		. . . . Including organic agent
728		. . . Including organic agent
729		. . Utilizing organic precipitant
730		. . . From natural source or chemical modification thereof
731		. . . . Starch
732		. . . Synthetic polymer
733		. . . . Acrylic
734		. . . . . Nitrogen containing (e.g., amine, azo, etc.)
735		. . . . Nitrogen containing (e.g., amine, azo, etc.)
736		. . . . . Derived from alkyl halide or epihalophydrin reactant
737		. . Including temperature change
738		. . Including agitation
739		. Including controlling process in response to a sensed condition
740		. . Density or specific gravity sensing
741		. . Pressure sensing
742		. . Temperature sensing
743		. . pH sensing
744		. . Level sensing
745		. . Turbidity or optically sensing
746		. . Electrical property sensing
747		. Including geographic feature (e.g., drainage ditch, septic, pond)
748		. Utilizing electrical or wave energy (directly applied to liquid or material being treated)
749		. Chemical treatment
750		. . Including degassing
752		. . Plural spaced feedings
753		. . Utilizing halogen or halogen containing material
754		. . . Chlorine or bromine containing
755		. . . . Organic
756		. . . . Hypochlorite
757		. . By chemical reduction
758		. . By oxidation
759		. . . Utilizing peroxy compound (e.g., hydrogen peroxide, peracid, etc.)
760		. . . Utilizing ozone
761		. . . Liquid phase high temperature and pressure (e.g., "wet air", etc.)
762		. . . . Catalytic
763		. . . Catalytic
764		. . Destroying microorganisms
765		. . Including liquid recirculation
766		. . Including temperature change
767		. Separating
768		. . Including treating separated solids
769		. . . Destroying cake or solid component
770		. . . Including drying (e.g., by squeezing or heating, etc.)
771		. . . . By gas contact
772		. . . Washing with a fluid other than the prefilt
773		. . Including preliminary conversion to liquid state
774		. . Including temperature change
775		. . . Thermal diffusion
776		. . Skimming
777		. . Including precoating filter medium with filter aid
778		. . . With or by addition to prefilt
779		. . Discharging residue to prefilt
780		. . Including movement of filter during filtration
781		. . . Centrifugally extracting
782		. . . . Blood
783		. . . Rotating belt
784		. . . Rotating drum
785		. . . Cleaning filter utilizing wave energy (e.g., vibrating, pulsating, etc.)
786		. . . Of particulate bed (e.g., fluidized or moving bed, etc.)
787		. . Cyclonic, or centrifugal (e.g., whirling or helical motion or by vortex, etc.)
788		. . . Introducing liquid tangentially
789		. . . Isolating layer
790		. . Dividing and recombining
791		. . Rehabilitating or regenerating filter medium
792		. . . Particulate bed
793		. . . . Reverse flow
794		. . . . . Including addition of diverse fluid
795		. . . . . . Expanded bed
796		. . . . Includng mechanical agitation
797		. . . By diverse fluid
798		. . . . Reverse flow
799		. . Filtering immiscible liquids
800		. . Utilizing gravitational force
801		. . . Including change of mainstream flow direction
802		. . . . Utilizing parallel separation passages
803		. . . Including specified feature of settled solids removal
804		. . . And additional diverse separation
805		. . And recirculating liquid
806		. . Plural separating
807		. . Utilizing particulate bed
808		. . Including specified pressure change
85		WITH ALARM, INDICATOR, REGISTER, RECORDER, SIGNAL OR INSPECTION MEANS
86		. Material level or thickness responsive
87		. Responsive to fluid flow
88		. . Meter-controlled cyclic systems
89		. . . With time control
90		. Fluid pressure responsive
91		. Position or extent of motion
92		. Test valve
93		. In effluent conduit
94		. Transparent
95		. . Sight glass
96.1		CONSTITUENT MIXTURE VARIATION RESPONSIVE
96.2		. With membrane
97		FLOW, FLUID PRESSURE OR MATERIAL LEVEL, RESPONSIVE
98		. Fluid current controlled cyclic system
99		. Prefilt deverting to drain by prefilt accumulation
100		. Flow cut-off requiring reset
101		. Proportionate feed means
102		. Programming plural units
103		. Diverse sensing means
104		. . Responsive to material level
105		. . With control for auxiliary liquid inlet
106		. Filter cleaning
107		. . Rotary movement of filter or mechanical cleaner
108		. . Backwash or blowback
109		. Discharge of treated material
110		. . With separator inlet control
111		. . Responsive to prefilt accumulation or filter clogging
112		. . Heavier constituent
113		. . . By weight of solids
114		. . . By treated liquid accumulation
115		. . . With lighter constituent outlet control
116		. . Permitted by filtrate accumulation
117		. . Check valve controlled
118		. . . Non-closing, e.g., sand valve
119		. . . Float type
120		. Vent control
121		. Float
122		. . Controls movable separator
123		. . Controls valve
124		. . . Controls flow between two separators
125		. . . Separator between float and valve
126		. . . Float in separate rehabilitating fluid tank
127		. . . Additional fluid inlet control
128		. . . Float in receptacle other than that of separator
129		. . . . In flow between inlet and separator
130		. Fluid pressure responsive by-pass
131		. . By movement of separation medium
132		. . With additional separation or treating means
133		. . In inlet and outlet closure header
134		. Plural elements controlled
135		. . Including manually controlled element
136		. Check valve
137		. Maintaining stream pressure or flow
138		WITH TIME CONTROL
139		. Of additional fluid
140		. . Preparation for treating operation
141		WITH PROGRAM ACTUATOR
142		. Plural treating units or sections sequentially controlled
143		AUTOMATIC CONTROL
144		. Responsive to vibration or unbalance
145		. Responsive to rotation
146		. . Controlled cover latch
147		. . Controlled discharge means
148		. Container movement operated
149		. Thermal
150		WITH GAS-LIQUID SURFACE CONTACT MEANS
151		. With separator
153		STRUCTURAL INSTALLATION
154		. Flume stream type
155		. . Plural or diverse screens
156		. . Fluid stream or residue operated
157		. . . Revolving cylindrical strainer
158		. . With cleaner for movable strainer
159		. . With cleaner and means to remove residue therefrom
160		. . Endless belt strainer
161		. . Revolving strainer
162		. . Fixed strainer
163		. Grated inlet surface drain
164		. . Flat grating at surface level
165		. . . With subsurface weep means
166		. . Concentric guard ring or rib
167		. Closed circulating systems
168		. . Lubrication
169		. . Aquarium or swimming pool
170		. Geographic (e.g., drainage ditch, septic, pond)
171		. Machinery
172		. Ancillary to storage tank
173		COMMINUTING
174		. Cylindrical strainer
175		WITH HEATER OR HEAT EXCHANGER
176		. Thermal diffusion
177		. With treating fluid addition
178		. . With mechanical agitator or movable separator
179		. With mechanical agitator or movable separator
180		. Vapor or gas removal
181		. Flow line connected in series with distinct separator
182		. Diverse separators
183		. . Common casing coaxial with heater
184		. For filter
185		. . Imbedded or between filter media
186		. . External of casing
187		. Within gravitational separator
188		WITH GAS SEPARATOR
189		PLURAL CHAMBERS WITH MOVEMENT OF GRANULES THEREBETWEEN
190		WITH EXTERNAL SUPPLY MEANS FOR REGENERATING MEDIUM, E.G., WATER SOFTENING SYSTEM
191		. With pump, injector or siphon
192		WITH PRELIMINARY CHEMICAL MANUFACTURE
193		WITH PRECOAT ADDING OR APPLYING MEANS
194		RECIRCULATION
195.1		. Serially connected distinct treating or storage units
195.2		. . With semipermeable membrane, e.g., dialyzer, etc.
195.3		. . With sediment recycle means directly to main stream
195.4		. . . Means is baffle slot
196		. Of filtrate
197		. From bottom of separator
198.1		WITH MEANS TO ADD TREATING MATERIAL
198.2		. Chromatography
198.3		. . Thin layer, e.g., plate, etc.
199		. Spaced along flow path
200		. Plural distinct separators
201		. . Serially connected
202		. . . Diverse type
203		. . Filters
204		. . . Sectional chamber press type
205		. With distinct reactor tank, trough or compartment
206		. . Chemical holder in series with separator
207		. . Within gravitational separator
208		. . . With mechanical agitator
209		. Directly applied to separator
210		. . To interior of moving filter, e.g., drum
211		. . . Through separator supporting rotary shaft
212		. . . With stationary casing closure feature
213		. . . With coaxial rotary impeller or distributor
214		. . . With stationary mount for movable distributor
215		. . . With effluent dividing means
216		. . Moving filter medium
217		. . . Drum
218		. . Gas removed from closed tank
219		. . With mechanical agitator
220		. . Submerged fluid inlet
221.1		. . . With outlet at surface, e.g., froth flotation, etc.
221.2		. . . . And gas injecting means other than by mechanical agitation
222		MAGNETIC
223		. With additional separator
224		SECTIONAL CHAMBER PRESS TYPE
225		. With residue removal or liquid agitation
226		. With porous filler
227		. Medium clamped in joint
228		. . With spacing frame
229		. . Imperforate base recess in plate
230		. With repair or assembling means
231		. Plates or frames
232		WITH REPAIR OR ASSEMBLING MEANS
233		. Piercing or closure knock out means
234		. Removable treatment part with normally disabled flow controller
235		. Placement of container opens flow controller
236		. Sliding or rolling on guide means
237		. Hoist or handle means
238		. . Hand manipulable
239		CONVERTIBLE
240		. Filter having selectively usable flow connector means
241		WITH MOVABLE SUPPORT
242.1		. Float
242.2		. . With aerating means
242.3		. . With oil water skimmer
242.4		. . With oil water sorption means
243		ELECTRICAL INSULATING OR ELECTRICITY DISCHARGING
244		PORTABLE RECEPTACLE WITH HOOD OR CLOSURE
245		. Attached variable flow controller
246		. Limited opening cover
247		FILTRATE SPLASH PLATE AND/OR DEFLECTOR
248		WITH DRIP, OVERFLOW OR CONTENT DRAINING FEATURE
249		BRACKET OR LEG SUPPORT FOR STATIC SEPARATOR ASSEMBLY
250		. Leg
251		COMBINED
252		SERIALLY CONNECTED DISTINCT TREATING WITH OR WITHOUT STORAGE UNITS
253		. Parallel
254		. With by-pass
255		. Cascade
256		. One unit inside another
257.1		. With storage unit
257.2		. . Having membrane
258		. With pump, gas pressure or vacuum source
259		. Diverse
260		. . Including multiple operation unit
261		. . One unit supports another
262		. . On different levels
263		PARTICULATE MATERIAL TYPE SEPARATOR, E.G., ION EXCHANGE OR SAND BED
264		. Selective units or compartments
265		. With gravitational separator
266		. With spaced non-particulate separating means
267		. Trunnion mounted casing
268		. Gravity flow of particles type
269		. With rehabilitation means
270		. . Movable means for particle pickup and redeposit
271		. . Surface traversing type
272		. . . Rotating on stationary axis
273		. . . Moving fluid distributor
274		. . Including means to apply gas to bed
275		. . Backwash or blowback means
276		. . . With mechanical agitator or residue remover
277		. . . Flow controller external of closed casing
278		. . . . Multi-way valve unit
279		. . . With embedded fluid distributor
280		. . With agitator
281		. . With access opening to normally closed casing
282		. Removable cartridge or hand-manipulated container
283		. Pervious divider between and contacting beds
284		. Spaced beds
285		. Embedded baffle
286		. . Vertical
287		. Within flow line or flow line connected closed casing
288		. . Conduit through bed, inlet and outlet at same end of casing
289		. . With particular liquid receiving means or foraminous bed retainer
290		. With multi-layer beds
291		. Particular liquid receiving means or foraminous bed retainer
292		. . Hood or top protector type
293		. . Floor type, e.g., false bottom
294		DIVERSE DISTINCT SEPARATORS
295		. Including a filter
296		. . Including liquid as a separating medium
297		. . Moving filter medium
298		. . With mechanical residue or sediment mover
299		. . Including constituent trapping feature
300		. . . Alternate filters and traps in series
301		. . . . Plural traps
302		. . . Flow-line valve upstream of separator
303		. . . Cut-off sediment trap
304		. . . Tangential flow, spiral or convolute baffle
305		. . . Baffle preceding or within sediment trap
306		. . . . Deflecting prefilt from filter medium
307		. . . Downstream of filter medium
308		. . . Directly communicating with tubular filter interior
309		. . . . Attached to filter element
310		. . . Lateral trap
311		. . . Downflow inlet, upflow through filter medium
312		. . . Sediment discharge means
313		. . . . Valve controlled
314		. . Spaced filters
315		. . . One within another
316		. . . One adjacent inlet or outlet conduit
317		. . . Including non-self-supporting medium
318		. . . Incompatible shapes
319		. With agitator
320		. With baffle perpendicular to flow direction
321.6		CASING DIVIDED BY MEMBRANE INTO SECTIONS HAVING INLET(S) AND/OR OUTLET(S)
321.61		. Membrane secured with adhesive of specified composition
321.62		. Antithrombogenic membrane
321.63		. Rotating mechanical agitator adjacent membrane
321.64		. Plural diverse structured membranes within a single casing
321.65		. Permeated liquid quantity measurement or control
321.66		. Energy recovery from treated liquid
321.67		. Membrane movement during purification
321.68		. . Nontranslatory rotary
321.69		. With membrane cleaning or sterlizing means (other than by filter movement or rotating agitator)
321.7		. . Solid cleaning material (e.g., balls)
321.71		. Dialyzer with dialysate proportioning means
321.72		. Each section having inlet(s) and outlet(s)
321.73		. . Noncoiled nonannular cross section tube
321.74		. . Coiled membrane
321.75		. . Planar membrane
321.76		. . . Spiral flow
321.77		. . Pleated membrane
321.78		. . Cylindrical membrane
321.79		. . . Plural cylindrical membranes all connected for parallel flow
321.8		. . . . All cylindrical membranes are parallel
321.81		. . . . . With embedded baffle
321.82		. Noncoiled nonannular cross section tube
321.83		. Coiled membrane
321.84		. Planar membrane
321.85		. . Spiral flow
321.86		. Pleated membrane
321.87		. Cylindrical membrane
321.88		. . Plural cylindrical membranes all connected for parallel flow
321.89		. . . All cylindrical membranes are parallel
321.9		. . . . With embedded baffle
322		PLURAL DISTINCT SEPARATORS
323.1		. Filters
323.2		. . Tubular
324		. . Movable separating elements
325		. . . Planetary
326		. . . Drum type on parallel axis
327		. . . Plural cleaners and plural movable elements
328		. . . Pivotally mounted sections
329		. . . Relatively movable
330		. . . Connected for group operation
331		. . . . Spaced filter wall type, e.g., multiple hollow leaves
332		. . With residue removal or liquid agitation
333.01		. . . Backwash or blowback
333.1		. . . . Sequential backwash
334		. . . Alternating filter and residue remover
335		. . In series for prefilt flow
336		. . . Tortuous path
337		. . . Nested units
338		. . . . Concentric filter elements
339		. . . Internal flange supporting filter element
340		. . Parallel filters with flow controller
341		. . . Individually controlled for removal with common receiver
342		. . One element within another
343		. . Alternating oppositely opening liquid distributors
344		. . Abutted alternating medium and pan type receiver
345		. . Radial or radially connected to central header
346		. . Spaced wall-type filters
347		. . . Central header
348		FILTER
349		. Pulsation dampener or gas trapping
350		. With movable means to compress medium
351		. . Actuating means external of closed casing
352		. . Internal spring
353		. Free cleaning means, e.g., loose abrading particles
354		. Medium, cleaner or agitator moved by fluid
355		. . Cleaner
356		. . Medium flexed
357		. Relatively movable members interleaved for cleaning
358		. Imperforate drum, medium on arc, chord or end
359		. Movable medium
360.1		. . Centrifugal extractor
360.2		. . . With inward flow of feed component
361		. . . With individual article container or support
362		. . . . Container or support reversible
363		. . . With adjustable rotation stabilizer
364		. . . Casing, shaft and filter unit gyratorily mounted
365		. . . Shaft and filter unit gyratorily mounted
366		. . . . Gyratory mounting above filter
367		. . . Filter gyratorily mounted on shaft
368		. . . With rotation brake
369		. . . Discharging residue
370		. . . . Secondary motion of filter medium
371		. . . . With variable flow controller
372		. . . . By residue engaging means
373		. . . . . Fixed
374		. . . . . Rotatable
375		. . . . . . Pivoted
376		. . . . . Axially reciprocable
377		. . . Internal work distributor
378		. . . Including filtrate receiving means having plural filtrate outlets
379		. . . Including filtrate receiving trough adjacent top discharge
380.1		. . . Rotating element construction
380.2		. . . . Laundry
380.3		. . . . Horizontal axis
381		. . . . Inwardly extending partitions
382		. . . . Top filtrate discharge
383		. . Separate agitator
384		. . Vibrator and unidirectional motion filter medium
385		. . With plural motion
386		. . Rolls or confining members contacting residue
387		. . Unrollable
388		. . Vibrating or longitudinally reciprocating
389		. . . Longitudinally moving prefilt type
390		. . Mounted on movable valve element
391		. . With cleaning means
392		. . . Fixed position or attached valve blocking means
393		. . . Backwash or blowback and additional cleaner
394		. . . Discharging inside, e.g., internal-type drum
395		. . . With filter-driven valve means
396		. . . Solid cleaner, e.g., scraper
397		. . . . With plural outlets from filter casing
398		. . Within sealed enclosure
399		. . . Movable casing
400		. . Belt type
401		. . . Superimposed on additional moving support
402		. . Drum type
403		. . . Internal feed
404		. . . Annular segmented compartment
405		. Movable prefilt distributor
406		. Vacuumized filtrate receiver
407		. With residue removing means or agitation of liquid
408		. . Diverse, e.g., combined agitators, scrapers, aeration blowback
409		. . Fluid cleaning
410		. . . Air pump type
411		. . . Backwash or blowback
412		. . . . Liquid pulsator
413		. . Fixed filter medium and movable stirrer or cleaner
414		. . . With plural outlets from filter casing
415		. . . Nontranslatory rotary
416.1		. With pump, gas pressure, or suction source
416.2		. . For aquarium or swimming pool
416.3		. . For drinking water
416.4		. . For fuel system
416.5		. . For lubricating or oil treating system
417		. Alternating oppositely opening liquid distributors
418		. With flow controller for material being treated
419		. . Attached to or within portable prefilt receiver
420		. . Selective directive flow relative to filter
421		. . . Pivoted prefilt deflector
422		. . . Plural outlets from filter casing
423		. . . . Attached unitary plural passage header
424		. . . Multi-way valve
425		. . . . Backwash
426		. . . . . Encased
427		. . . Backwash
428		. . Combining or dividing flow passages with filter in combined passage
429		. . Filter coaxial with valve seat or valve stem
430		. . . Filter surrounds valve
431		. . . Filter fixed to valve seat, opposed to valve head
432		. . Filter in valve body recess
433.1		. Divided filtered, and unfiltered liquid passages
434		. . Recombining
435		. Within flow line or flow line connected close casing
436		. . Vented
437		. . Central internal liquid receiver, e.g., tube
438		. . . Imperforate central liquid tube
439		. . . . Axial flow through filter element
440		. . . Inlet and outlet at same end
441		. . . Attached to casing
442		. . . . Head and base connected
443		. . Inlet and outlet at same end
444		. . . Filter suspended from head
445		. . Clamped in casing joint
446		. . Axially aligned inlet and outlet
447		. . . Laterally removable
448		. . . Single open-end-type filter element
449		. . . Pipe end attached closed casing, e.g., faucet
450		. . Gasket within casing or spaced removable end members
451		. . Internal fixed shoulder supporting filter element
452		. . . Single open-end-type filter element
453		. . Filter element clamped between closure and end wall
454		. . Filter element attached to closure
455		. Receptacle and modified spacing surface or support for filter medium
456		. Prefilt flow distributor or diverter
457		. With central pervious tubular receiver
458		. . Plural concentric receivers
459		. Pipe or plate attached type
460		. . Attached to open end of pipe
461		. . . Spaced wall-type element
462		. . . Pipe is connection to plate
463		. . . Inserted holder
464		. Portable receptacle draining type
465		. . Cooperating handles on receptacle and drainer
466		. . Receptacle spout
467		. . . Within receptacle proper
468		. . . Spaced from spout discharge
469		. . On or adjacent receptacle upper edge
470		. Handled
471		. . Ring type
472		. Vented
473		. Resting on supporting receiver, e.g., portable
474		. . At upper edge of filtrate receiver
475		. . . Filter offset in cover
476		. . . Telescoped receivers or receiver sections
477		. . Resting on internal stop or surface
478		. . . Unitary filter medium and radially expandable retainer
479		. . . Inner separate retainer
480		. . . . With contractor for expandable retainer
481		. . . Longitudinal retainer or guide, (e.g., reflex coffee maker)
482		. . At lower end or prefilt receiver
483		. Supported, shaped or superimposed formed mediums
484		. . Medium within foraminous supporting container or sheath
485		. . External cage-type support
486		. . Spaced wall type, e.g., hollow leaf
487		. . . Concentric, convolute or pleated
488		. . Abutted or superimposed members
489		. . . For series flow
490		. . . . Integral or coated layers
491		. . . . . All fibrous
492		. . . Alternating dissimilar
493.1		. . Pleated
493.2		. . . Bonded end caps
493.3		. . . Rectangularly shaped
493.4		. . . Spirally formed
493.5		. . . Filter element
494.1		. . Convolute
494.2		. . . Metal
494.3		. . . With edge spacer
495		. . Single ring or closed frame type
496		. . Bound, fused or matted, e.g., porous shapes, sponges, etc.
497.01		. . Cylindrical, conical, or trough shape
497.1		. . . Helically wound
497.2		. . . Filter blank
497.3		. . . Conical
498		. . Perforated or grooved plates
499		. . Screens, e.g., woven
500.1		. Material
500.21		. . Semipermeable membrane
500.22		. . . Isotropically pored
500.23		. . . Hollow fiber or cylinder
500.24		. . . Antithrombogenic coating or membrane
500.25		. . . Metal containing
500.26		. . . Glass
500.27		. . . Organic
500.28		. . . . Cyclic
500.29		. . . . . Cellulosic
500.3		. . . . . . Cellulose acetate
500.31		. . . . . . . Cellulose diacetate
500.32		. . . . . . . Cellulose triacetate
500.33		. . . . . Homocyclic
500.34		. . . . . . Styrene
500.35		. . . . Acrylate
500.36		. . . . Alkene other than vinyl
500.37		. . . . Amine
500.38		. . . . . Amide
500.39		. . . . . . Imide
500.4		. . . . Carbonate
500.41		. . . . Sulfone
500.42		. . . . Vinyl
500.43		. . . . . Acrylonitrile
501		. . Sterilizing or neutralizing agent containing
502.1		. . Sorptive component containing
503		. . Diverse granular or fibrous
504		. . . With adhered coating or impregnant
505		. . . Including fibers
506		. . Coated or impregnated, e.g., adhesively bound
507		. . . Fabrics
508		. . . Fibrous
509		. . . . Inorganic
510.1		. . Porous unitary mass
511		LIQUID AS SEPARATING MEDIUM
512.1		TANGENTIAL FLOW OR CENTRIFUGAL FLUID ACTION
512.2		. Multiple cyclone
512.3		. With movable means affecting flow
513		GRAVITATIONAL SEPARATOR
514		. Portable invertible, e.g., milk and cream separator
515		. . Selective withdrawal of constituents
516		. . Resilient deformable isolator
517		. . . Hinged to handle
518		. . Sectional isolator
519		. Material supply distributor
520		. . Rotatable
521		. Superposed compartments or baffles, e.g., parallel plate type
522		. . Each with lighter constituent discharge
523		. Mechanical constituent mover
524		. . Diverse serial
525		. . Scum sediment removal
526		. . Endless belt or chain
527		. . Rectilinearly movable supporting means
528		. . Horizontally rotating scraper
529		. . . Polygonal container and correlating mover
530		. . . Tank rim-supported carriage
531		. . . Elevatable scrapers
532.1		. Heavier constituent trap, chamber, or recess
532.2		. . Septic tank
533		. . Closure or valve controlled discharge
534		. . . In sloping recess
535		. . . . Downstream of separator
536		. . . In side wall of separator
537		. . . With discharge means for two or more lighter constituents
538		. Lighter constituent trap
539		. . Gas vent or bypass
540		. . With discharge port
541		ADJUNCTS
542		MISCELLANEOUS
		******************************
		CROSS-REFERENCE ART COLLECTIONS
		******************************
900		ULTRA PURE WATER (E.G., CONDUCTIVITY WATER)
901		SPECIFIED LAND FILL FEATURE (E.G., PREVENTION OF GROUND WATER FOULING)
902		MATERIALS REMOVED
903		. Nitrogenous
904		. . -CN containing
905		. . Protein
906		. Phosphorus containing
907		. . Phosphate slimes
908		. Organic
909		. . Aromatic compound (e.g., PCB, phenol, etc.)
910		. . Nonbiodegradable surfacant
911		. Cumulative poison
912		. . Heavy metal
913		. . . Chromium
914		. . . Mercury
915		. Fluorine containing
916		. Odor (including control or abatement)
917		. Color
918		MISCELLANEOUS SPECIFIC TECHNIQUES
919		. Using combined systems by merging parallel diverse waste systems
920		. Using combined systems of sequential local and regional or municipal sewage systems
921		. Flow equalization or time controlled stages or cycles
922		. Oil spill cleanup (e.g., bacterial, etc.)
923		. . Using mechanical means (e.g., skimmers, pump, etc.)
924		. . Using physical agent (e.g., sponge, mop, etc.)
925		. . Using chemical agent
926		. Using oxidation ditch (e.g., carousel, etc.)
928		PAPER MILL WASTE (E.G., WHITE WATER, BLACK LIQUOR, ETC.) TREATED
929		HEMOULTRAFILTRATE VOLUME MEASUREMENT OR CONTROL PROCESSES
930		PAINT DETACKIFYING
		******************************
		DIGESTS
		******************************
DIG 3		Belt alignment
DIG 5		Coalescer
DIG 6		Dehydrators
DIG 7		Drier blocks
DIG 8		Fat fryer
DIG 9		Floating cover
DIG 13		Part flow-full flow
DIG 17		Twist-on

Information Products Division -- Contacts

Questions regarding this report should be directed to:

U.S. Patent and Trademark Office
Information Products Division
PK3- Suite 441
Washington, DC 20231

tel: (703) 306-2600
FAX: (703) 306-2737
email: oeip@uspto.gov

---

Last Modified: 6 October 2000