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 [Search a list of Patent Appplications for class 55]   CLASS 55,GAS SEPARATION
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SECTION I - LINES WITH OTHER CLASSES AND WITHIN THIS CLASS

Class 55 is an integral part of Class 96 and follows subclass 429 in Class 96 in the schedule hierarchy. Class 55 uses the class definition and class lines established in and for Class 96. Class 55 provides for the gas separation apparatus that has not yet been reclassified.

SUBCLASSES

[List of Patents for class 55 subclass 282]    282WITH NONLIQUID CLEANING MEANS FOR SEPARATING MEDIA:
 This subclass is indented under the class definition.  Apparatus having means (1) to apply a nonliquid cleaning agent (gas or solid) to a separator part, (2) to remove separated constituents adhering to the surfaces or from within the interstices of the separating media, or (3) to prevent (in as far as possible) accumulation of constituents on the separating surfaces by some active means or through the use of materials having special characteristics or properties for such purpose.

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96, Gas Separation: Apparatus,   subclasses 228+ for gas separation apparatus with means using liquid to clean the separating apparatus and subclasses 425+ for gas separation apparatus having means timing or programming the cleaning mechanism.
  
[List of Patents for class 55 subclass 282.1]    282.1Having insulation:
 This subclass is indented under subclass 282.  Apparatus provided with means to prevent heat exchange between a gaseous fluid mixture or separated constituent and a surrounding atmosphere.
  
[List of Patents for class 55 subclass 282.2]    282.2With heating or cooling means:
 This subclass is indented under subclass 282.  Apparatus having means for raising or lowering the temperature of a gaseous fluid mixture or separated constituent.
  
[List of Patents for class 55 subclass 282.3]    282.3Residue burned:
 This subclass is indented under subclass 282.2.  Apparatus having means for removing the separated constituents adhering to the surfaces or from within the interstices of the separating media by combustion.
  
[List of Patents for class 55 subclass 282.4]    282.4Two confined fluids in indirect contact:
 This subclass is indented under subclass 282.2.  Apparatus provided with a conduit or flow conductor for passing a nonsystem fluid proximate to but not in direct contact with at least a portion of a bounded gaseous fluid mixture or separated constituent to effect heat exchange therebetween, the nonsystem fluid being separate and distinct from the bounded gaseous fluid mixture or separated constituent.
  
[List of Patents for class 55 subclass 282.5]    282.5Heat exchanger is part of separator or is contiguous therewith:
 This subclass is indented under subclass 282.4.  Apparatus in which the nonsystem fluid conduit or conductor is structurally associated with the confined gaseous fluid mixture or separated constituent at or proximate to the locus of separation so that the temperature of the confined gaseous fluid mixture or separated constituent is affected at the separator.
  
[List of Patents for class 55 subclass 283]    283With automatic control of cleaning means:
 This subclass is indented under subclass 282.  Apparatus comprising a means to sense a condition which may or may not occur, or a lack of such condition, or the result of such condition, the sensing means causing or permitting operation of a separate means for controlling said cleaning agent applying means, said constituent removing means or said accumulation preventing means, without the intervention of a human attendant.
(1) Note. An example of an automatic means under this definition is a device in which a diaphragm, responding to a differential pressure across the media, an increased pressure upstream of the media or a decreased pressure downstream of the media, moves a stem attached to the diaphragm to open a valve for applying a cleaning agent to the media.
An example of means which is not automatic control under this definition is a motor or clock driven cam which controls the valve for applying a cleaning agent at predetermined times or revolutions.
  
[List of Patents for class 55 subclass 284]    284With sequential cleaning of plural units:
 This subclass is indented under subclass 282.  Apparatus having two or more substantially independently functioning separating media and further including means whereby the media are serially refurbished in some predetermined order defined by the law of the machine.
(1) Note. For this and the indented subclasses the qualification of independent separating media is considered met by apparatus in which a running length of separating material has been supported or maintained in a manner to form from such length a plurality of separate and distinct media simultaneously used for separation, i.e. some portions at the region of support thereof blocked from gas separating operation.

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96, Gas Separation: Apparatus,   subclasses 426+ for gas separation apparatus having means for sequential cleaning of plural separating units with timing or changeable programming means.
  
[List of Patents for class 55 subclass 285]    285Ferris wheel type filter unit arrangement:
 This subclass is indented under subclass 284.  Apparatus in which the separating media are arranged about a horizontal axis and form a type of circular cylinder or wheel and spoke-like arrangement with the said entities at the periphery or rim.
  
[List of Patents for class 55 subclass 286]    286With gas flow arresting means:
 This subclass is indented under subclass 284.  Apparatus having means to prevent flow of system fluid through selected ones of the media.
  
[List of Patents for class 55 subclass 287]    287Interconnected with cleaning means:
 This subclass is indented under subclass 286.  Apparatus in which the operation of the flow preventing means is controlled simultaneously with or by the refurbishing mechanism or the control therefor.
  
[List of Patents for class 55 subclass 288]    288Interdependent or interoperated gas flow cutoff or apparatus shutdown and media cleaning:
 This subclass is indented under subclass 282.  Apparatus wherein cleaning of the separating media is dependent on and occurs as a direct result of the actuation or operation of (1) means (e.g. valve) for completely preventing the flow of system fluid to the separating media or (2) means (e.g. on-off gas flow switch) for completely closing down the separating operation.

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286+,for devices for sequentially cleaning a plurality of separating media combined with means for preventing the flow of gas undergoing separation from reaching the media which is being cleaned.
  
[List of Patents for class 55 subclass 289]    289Interdigitated comb and separating media:
 This subclass is indented under subclass 282.  Apparatus comprising a multiple tined member peculiarly adapted to enter spaced interstices, openings or parallel bars or wires of the media to remove accumulated solids either by a motion generally at right angles to the plane of said media or longitudinally of the elements thereof.
  
[List of Patents for class 55 subclass 290]    290For moving indefinite or continuous length separating media:
 This subclass is indented under subclass 282.  Apparatus comprising means for refurbishing media of the endless type (e.g. of cylindrical form) or media which is handled and supported without regard to a leading or trailing edge or end, said media being in motion during use for its separating function.

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351+,for similar separating media.
  
[List of Patents for class 55 subclass 291]    291Plural diverse cleaning means:
 This subclass is indented under subclass 282.  Apparatus involving the use of two or more cleaning agent applying, constituent removing or accumulation preventing means of different types (e.g. pneumatic nozzle and vibrating means).
  
[List of Patents for class 55 subclass 292]    292Sonic type:
 This subclass is indented under subclass 282.  Apparatus having means for producing compressional vibratory wave energy in a fluid medium in relation to or associated with the separating media to cause adhered constituents to be removed from the separating media, said waves being below, within or beyond the audible spectrum.
(1) Note. Pressure pulses in a fluid generated merely by intermittent discharge of a gas are not considered to be compressional vibratory waves under this definition. However, compressional vibratory waves under this definition may be produced by intermittent discharge of a gas, as in a siren. Devices in which cleaning of the separating media is effected by pressure pulses of a gas will be found in subclasses 293 and 301+.

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96, Gas Separation: Apparatus,   subclass 389 for gas separation apparatus using sound waves to effect or enhance separation.
  
[List of Patents for class 55 subclass 293]    293With separating media pneumatically vibrated or flexed:
 This subclass is indented under subclass 282.  Apparatus comprising means to effect motion of small amplitude and relative high frequency of the media by contact of gasiform fluid therewith to effect the cleaning thereof.
  
[List of Patents for class 55 subclass 294]    294Relatively movable pneumatic nozzle (e.g., scanning nozzle):
 This subclass is indented under subclass 282.  Apparatus comprising a gasiform fluid discharging means directed against or along the media and being supported for motion relative to said media to dislodge accumulated constituent material.
  
[List of Patents for class 55 subclass 295]    295Solid agent cleaning member movingly contacts apparatus:
 This subclass is indented under subclass 282.  Apparatus in which a nonfluid agent (e.g., brush, rapper, scraper blade) moves relative to the apparatus to effect a physical contact therebetween or to advance across a surface thereof.
  
[List of Patents for class 55 subclass 296]    296Agent has defined traversing motion relative to separating media:
 This subclass is indented under subclass 295.  Apparatus comprising an agent which has a prescribed relative movement across, and in contact with, at least a portion of a surface of a separating media.
  
[List of Patents for class 55 subclass 297]    297With motion effecting means interrelated with separating operation:
 This subclass is indented under subclass 296.  Apparatus in which the operation of the agent to traverse the media is integrated with the separating apparatus operation such that the two operations function simultaneously.
  
[List of Patents for class 55 subclass 298]    298Gas flow actuates member:
 This subclass is indented under subclass 297.  Apparatus in which the agent is caused to move as a result of the flow of system fluid through the apparatus.
  
[List of Patents for class 55 subclass 299]    299With resulting flexing or distortion of resilient or collapsible separating media:
 This subclass is indented under subclass 296.  Apparatus wherein the media is of nonrigid form and is flexed or deformed by contact of the agent therewith.
  
[List of Patents for class 55 subclass 300]    300Vibrating, jarring, or rapping means:
 This subclass is indented under subclass 295.  Apparatus in which either the separating surface or some portion of the apparatus is struck by the agent with relatively sharp and repeated blows to shake the separating media.

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96, Gas Separation: Apparatus,   subclasses 32+ for electric field separation apparatus having vibrating, jarring, or rapping means for cleaning parts of the apparatus.
  
[List of Patents for class 55 subclass 301]    301Cohesive filter media cleaning:
 This subclass is indented under subclass 282.  Apparatus for renovating or refurbishing a coherent sheet or mass type filter media.

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282,for means for cleaning discrete fibrous or particulate material filter media.
351,for continuous type filters with means for advancing or replacing the used filter with a new or cleaned portion thereof.
  
[List of Patents for class 55 subclass 302]    302Pneumatic reverse flushing:
 This subclass is indented under subclass 301.  Apparatus in which a gasiform fluid is brought into contact with the media in a direction opposed to system fluid flow during separation.

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294,for pneumatic scanning nozzles.
  
[List of Patents for class 55 subclass 303]    303Draft diverted from one side of filter to other:
 This subclass is indented under subclass 302.  Apparatus in which the gasiform fluid is bled or taken at one face (upstream or downstream) of the media and directed to the other.
  
[List of Patents for class 55 subclass 304]    304Filter manipulation, shaking or flexing for precluding or removing encrustation:
 This subclass is indented under subclass 301.  Apparatus comprising means effecting or enabling filter motion or a relative movement among portions thereof whereby accumulations are removed or prevented.
  
[List of Patents for class 55 subclass 305]    305Attendant actuated manipulating means:
 This subclass is indented under subclass 304.  Apparatus wherein the means is arranged for actuation by a human being (e.g. by hand).
  
[List of Patents for class 55 subclass 306]    306AIRCRAFT ANTI-INGESTION MEANS (E.G., AIRCRAFT DEBRIS GUARD):
 This subclass is indented under the class definition.  Apparatus associated with an aircraft and related to the air intake means of the power plant (e.g., ram jet engine) of said aircraft to prevent the inflow of ground or air borne objects or creatures to the said power plant by screen or deflector like means.
(1) Note. Gratings, grids, grilles and foraminous members structurally similar to the devices of this subclass are classifiable in many other classes as partially indicated under Search Class as follows.

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15, Brushing, Scrubbing, and General Cleaning,   subclasses 238+ for scrapers comprising wire or pivoted link mats.
52, Static Structures (e.g., Buildings),   subclasses 633+ for an openwork-structure not elsewhere provided for and see the notes for other classes having openwork structures.
166, Wells,   subclasses 227+ for screens or other filters disclosed for separating solids from the earth fluid flowing into a well conduit.
239, Fluid Sprinkling, Spraying, and Diffusing,   subclasses 127.1+ and 265.11+ for a reaction motor discharge nozzle which may have a screen or deflector associated with the fluid inlet.
244, Aeronautics and Astronautics,   appropriate subclasses for similar means involving modified aircraft structure.
245, Wire Fabrics and Structure,   subclasses 2+ for screens or grids comprising wires looped or twisted around each other.
256, Fences,   various subclasses for similar devices.
428, Stock Material or Miscellaneous Articles,   subclasses 131+ for a single or plural layer stock material product in the form of a web or sheet including an apertured component.
454, Ventilation,   appropriate subclasses for gratings, louvers, or screens associated with chimneys, ventilation air inlets, or registers.
  
[List of Patents for class 55 subclass 307]    307FILTER OR APERTURED DEFLECTOR UNIT DISCONTINUOUS ACROSS GAS FLOW WITHIN FLOW CONDUIT:
 This subclass is indented under the class definition.  Apparatus comprising a separator means positioned at least in part within a confined system fluid path, there being an unobstructed space between it and the side wall of the flow path as supported therein and being further comprised of a member or material having (1) multiple openings, pores or passages (2) massed discrete filter particles, or (3) a single opening therethrough.
(1) Note. A unit is any member or assemblage of members adapted to be handled as a subassembly when being associated with a conduit.

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309,for open separator bypass means provided by discontinuous separator members placed at the terminus of the flow line or there beyond and not relying upon valves or other movable flow controlling means.
422,for movably mounted or supported media adjustable to various positions of use or to nonuse.
445+,for members which are either perforated and coextensive with the flow path wall or solid and spaced from the wall, so that the mixture has only one path to follow, either around or through the member.
  
[List of Patents for class 55 subclass 308]    308Multiple members serially spaced in flow conduit:
 This subclass is indented under subclass 307.  Apparatus comprising at least two of said separator means which are substantially identical and are spaced within the confined flow path in the direction of gas flow.

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442+,for serially spaced deflector surfaces.
482+,for serially spaced filter members.
  
[List of Patents for class 55 subclass 309]    309WITH SEPARATING MEDIA BYPASS OR SYSTEM GAS PRESSURE RELIEF (E.G., RUPTURABLE OR DEFORMABLE):
 This subclass is indented under the class definition.  Apparatus provided with means (1) to permit total flow of the system fluid directed through the apparatus to avoid the separating means, or at least one stage of serially arranged separating means, (2) to admit ambient air to the apparatus through other than the normal inflow path of fluid to be separated, or (3) to permit discharge or escape of system fluid to the ambient air through other than the normal gas effluent path.
(1) Note. Pressure relief is not a matter of mere multiple discharge paths or inlet paths, but some modified arrangement for flow which responds to excessive or back pressures.
(2) Note. A bypass means under this definition does not include a mere movably or removably mounted separator means, but does include a separating means which, in response to certain gas pressure or flow characteristics, is moved out of its normal use position to provide for a bypass therearound.

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96, Gas Separation: Apparatus,   subclasses 372+ for gas separation apparatus including inlet means for diverse gas or solid for gas treatment.
  
[List of Patents for class 55 subclass 309.1]    309.1With heating or cooling means:
 This subclass is indented under subclass 309.  Apparatus having means for raising or lowering the temperature of a gaseous fluid mixture or the separated constituent.
  
[List of Patents for class 55 subclass 310]    310Pressure relief means to or from atmosphere:
 This subclass is indented under subclass 309.  Apparatus having means responsive to super or sub-atmospheric pressures within the apparatus either to discharge system fluid therefrom to the surrounding atmosphere or to permit inflow of air from the surrounding atmosphere through other than the normal system fluid inlet.

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96, Gas Separation: Apparatus,   subclasses 400+ for gas separation apparatus having gas pressure responsive means for gas cutoff or diversion.
  
[List of Patents for class 55 subclass 311]    311Relief means is downstream of media (e.g., ambient air bypasses filter):
 This subclass is indented under subclass 310.  Apparatus in which the means is physically situated below the separating means in the path of travel of the system fluid.
  
[List of Patents for class 55 subclass 312]    312Valved bypass means:
 This subclass is indented under subclass 309.  Apparatus having valve means to permit flow of system fluid around a separating means to thereby avoid the separating function of at least that one separating means.
(1) Note. In this subclass are collected patents having an auxiliary inlet which is downstream of the separator and which is hand controlled.
(2) Note. Flow control of gas for separators in parallel either as distinct units or as separator parts of a single unit is not subject matter for these subclasses.
  
[List of Patents for class 55 subclass 313]    313Gas force responsive:
 This subclass is indented under subclass 312.  Apparatus in which the means permitting flow around or by the separating means is responsive to a force exerted thereon by the system fluid.

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96, Gas Separation: Apparatus,   subclasses 400+ for gas separation apparatus having gas pressure responsive means for gas cutoff or diversion.
  
[List of Patents for class 55 subclass 314]    314Shunt means for total flow:
 This subclass is indented under subclass 312.  Apparatus having flow conducting means between the apparatus inlet and outlet permitting all of the inflowing system fluid to pass to the egress means without flowing through the separating means or at least one stage thereof if serially arranged distinct separators are included.
  
[List of Patents for class 55 subclass 315]    315PLURAL SERIAL BASICALLY DIVERSE SEPARATING MEDIA:
 This subclass is indented under the class definition.  Apparatus having two or more discrete separators arranged one downstream of the other, at least two of the separators being of differing basic types.
(1) Note. Basic types of separators here included are, for example; expansion chambers, deflectors (fixed baffles, whirl chambers and moving members), filters (screens, porous mass or pad, cohesive sheet material), sorbers and the like.
(2) Note. The patents in these subclasses usually comprise separate and distinct diverse separating members. However, in subclass 335 indented hereunder will be found integral or connected deflectors and filters, usually a conical screen with an upstream deflector surface for the gas to first impinge upon and be deflected by the surface and then be screened or filtered through the foraminous member.
(3) Note. Concentrate collection receptacles or retainers provided with gas escape means and which serve to permit concentrate to be in part air borne to the said receptacle and therefore act as a secondary separator are not considered as separators for classification with serially arranged diverse separators under this definition, but as proper subject matter for subclass 428.

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342+,for serially arranged multiple similar separators.
  
[List of Patents for class 55 subclass 315.1]    315.1With heating or cooling means or having insulation:
 This subclass is indented under subclass 315.  Apparatus having means for raising or lowering the temperature of a gaseous fluid mixture or separated constituent or having means to prevent heat exchange between a gaseous fluid mixture or a separated constituent and a surrounding atmosphere.
  
[List of Patents for class 55 subclass 315.2]    315.2Heat exchanger is part of separator or is contiguous therewith:
 This subclass is indented under subclass 315.1.  Apparatus in which a conduit or flow conductor, which permits passage of a nonsystem fluid proximate to but not in direct contact with at least a portion of a bounded gaseous fluid mixture or separated constituent to effect heat exchange therebetween, is structurally associated with the bounded gaseous fluid mixture or separated constituent at or proximate the locus of separation so that the temperature of the bounded gaseous fluid mixture or separated constituent is affected at the separator.
  
[List of Patents for class 55 subclass 317]    317At least one mounted for continuous motion:
 This subclass is indented under subclass 315.  Apparatus comprising at least one separator arranged for continuous movement relative to a fixed point or support and effecting separation of a gas mixture while so moving.

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400+,for a separator comprising a continuously moving member, but not in combination with a separator of a diverse type.
  
[List of Patents for class 55 subclass 318]    318Plural stages in unitary casing:
 This subclass is indented under subclass 315.  Apparatus comprising separators of different basic types arranged in a single housing or flow confining means.
  
[List of Patents for class 55 subclass 319]    319Including expansion chamber:
 This subclass is indented under subclass 318.  Apparatus comprising an enlarged section of the flow line, the enlarged section being disclosed for retarding the velocity of the gas mixture and allowing the heavier constituents to settle out therefrom.
(1) Note. See the class definition, search class notes, Classes 137 and 261, for placement of patents comprising expansion chambers.

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137, Fluid Handling,   subclasses 171+ for fluid separating traps or vents including the expansion chamber type and see (1) Note above.
  
[List of Patents for class 55 subclass 320]    320Deflector and fibrous, filamentary, particulate solids, or cohesive sheet filter type:
 This subclass is indented under subclass 318.  Apparatus including an impingement or flow redirecting separator means together with a separator means of the type which retains thereon or prevents passage therethrough of nongaseous particles, the latter being comprised of massed entangled individual strands, massed individual discrete elements, numerous unentangled discrete strands (brush type) or coherent sheet porous or foraminous material.

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318,for similar combinations wherein the filter comprises a solid, rigid, porous member (e.g. sintered or ceramic).
  
[List of Patents for class 55 subclass 321]    321Multiple of one type in series of parallel in flow path:
 This subclass is indented under subclass 320.  Apparatus comprising three or more separators, at least two of which are of the same basic type, and at least one of a different basic type, the separators of the same basic type being spaced either transverse across, or serially along the flow line.

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342+,for multiple similar separators in series or parallel, but with the discrete flow inlet and outlet paths as defined therein.
442+,for plural impingement or flow redirecting surfaces serially spaced.
482+,for two or more filters of the same type arranged in series or in parallel.
  
[List of Patents for class 55 subclass 322]    322Serially spaced with at least one of other type intermediately positioned:
 This subclass is indented under subclass 321.  Apparatus in which one of the multiple similar or same basic type separators is positioned upstream and another downstream of one or more of a different type separator.
  
[List of Patents for class 55 subclass 323]    323Filters:
 This subclass is indented under subclass 321.  Apparatus in which the multiple, similar separators are of the type which retain thereon or prevent passage therethrough of nongaseous particles.
  
[List of Patents for class 55 subclass 324]    324In parallel:
 This subclass is indented under subclass 323.  Apparatus in which the separators are spaced transversely across the flow line.

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483,and 484, for multiple filters arranged in parallel, but not combined with a diverse separating member.
  
[List of Patents for class 55 subclass 325]    325Serially spaced deflectors:
 This subclass is indented under subclass 321.  Apparatus in which the multiple similar separators are of the flow impingement or redirecting type and are spaced along the flow path in the direction of gas flow.

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442+,for redirecting or impingement surfaces spaced serially in a flow path.
  
[List of Patents for class 55 subclass 326]    326With connected trough or channel:
 This subclass is indented under subclass 325.  Apparatus in which at least one of the flow redirecting or impingement means is provided with a basin, box, gutter or other similar member having a closed bottom and open top for receiving and retaining or guiding the separated heavier constituent.
  
[List of Patents for class 55 subclass 327]    327Filter is most upstream:
 This subclass is indented under subclass 320.  Apparatus in which the member first contacted with the fluid mixture in the housing or flow confining means is of the type which retains thereon or prevents passage therethrough of nongaseous particles.
  
[List of Patents for class 55 subclass 328]    328Movable or movable mounted for adjustment or nonuse:
 This subclass is indented under subclass 320.  Apparatus in which any one of the diverse separating members is supported for motion to various positions to or from a position wherein the member does not affect the fluid mixture.

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422,for a filter or deflection separator, per se, supported as herein described.
  
[List of Patents for class 55 subclass 329]    329Filamentary brush type or fibrous mass:
 This subclass is indented under subclass 320.  Apparatus in which the means other than the impingement or flow redirecting means comprises a mass of entangled strands or numerous unentangled discrete strands.

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477,for brush type filters.
512+,and 527+, for entangled fibrous or strand mass type filters.
  
[List of Patents for class 55 subclass 330]    330Tubular or annular for radial gas flow:
 This subclass is indented under subclass 329.  Apparatus in which the means is hollow and arranged within the flow line so that the system fluid flow is toward or away from the central axis.
  
[List of Patents for class 55 subclass 331]    331Conical deflector with curved or parabolic radially extending wide downstream end:
 This subclass is indented under subclass 320.  Apparatus in which the impingement or flow redirecting means comprises a member which increases in diameter in the direction of gas flow and at its maximum diameter is provided with an arched or curved element extending outwardly.

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463,for a similar impingement surface, per se.
  
[List of Patents for class 55 subclass 332]    332Cohesive sheet-like filter:
 This subclass is indented under subclass 320.  Apparatus in which the means other than the impingement or flow redirecting means comprises a coherent sheet of porous or apertured material (e.g. paper, woven wire or fabric).

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495+,and 522+, for coherent sheet material filters.
  
[List of Patents for class 55 subclass 333]    333Multiple contiguous layers or coils with radial gas flow:
 This subclass is indented under subclass 332.  Apparatus in which the means comprises two or more layers each in contact with the next adjacent and either stacked or wound upon the other so as to form a tubular member and so arranged in the flow line that the system fluid flow is toward or away from the tube axis.
  
[List of Patents for class 55 subclass 334]    334Bag type:
 This subclass is indented under subclass 332.  Apparatus in which the coherent sheet means comprises one closed and one open end defined by a side wall to encompass a space, the system fluid flow being into or out of the space through the porous or apertured material.
(1) Note. The bag filter need not be capable of being flexed or distorted while in use position as required for the bag filters provided for in subclass 361 below.

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341,and 361+, for other bag type separators and see (1) Note above.
  
[List of Patents for class 55 subclass 335]    335Including imperforate upstream bag end deflector:
 This subclass is indented under subclass 334.  Apparatus in which the coherent sheet encompassing the space has included therewith, in use position, an impingement or redirecting surface so fixed or associated with the sheet as to be contacted by the system fluid prior to said fluid coming in contact with the sheet.
(1) Note. These filtering and deflecting elements may be integral, one with the other. See (2) Note under subclass 315.

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368,for flexible or collapsible bag type separators having a spaced interior inflow path or with means modifying air flow in the bag usually to define a trap or collecting chamber for the separated constituent rather than to effectuate the separation of a constituent from the gas stream.
  
[List of Patents for class 55 subclass 336]    336Conical:
 This subclass is indented under subclass 332.  Apparatus in which the coherent sheet like filter means tapers towards or from a point.
(1) Note. There need not be an apex for the cone. The material may be in the form of a frusto cone.
  
[List of Patents for class 55 subclass 337]    337Cyclone or centrifugal whirl type deflector:
 This subclass is indented under subclass 332.  Apparatus in which the impingement or flow redirecting means causes the system fluid to assume a spinning or turning motion around an axis.

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345+,and 447+, for other apparatus in which separation is caused by the gas rotating around an axis.
  
[List of Patents for class 55 subclass 338]    338WITH RECYCLE MEANS:
 This subclass is indented under the class definition.  Apparatus having means to direct system fluid which has passed through a stage of separation back through or substantially through the inlet to the apparatus or back through a distinct stage of serially arranged separators.
(1) Note. Redirecting system fluid substantially back to the inlet is meant to include both internal and external arrangements of flow means wherein the redirected fluid enters upstream of the first apparatus part which influences the separating action.
(2) Note. Recycle apparatus may never lose control of the system fluid; e.g., effluent may not be discharged to the atmosphere and then sucked back again.
(3) Note. For these subclasses system fluid may be the partially or totally cleansed effluent, or may be the gas which has escaped to the concentrate or residue chamber.
  
[List of Patents for class 55 subclass 338.1]    338.1With heating or cooling means:
 This subclass is indented under subclass 338.  Apparatus having means for raising or lowering the temperature of a gaseous fluid mixture or separated constituent.
  
[List of Patents for class 55 subclass 339]    339For concentrate entrained in effluent gas outlet means:
 This subclass is indented under subclass 338.  Apparatus in which the fluid returned to the inlet for recycle is derived from or bled off the effluent making its way through the apparatus cleansed gas outlet means.
(1) Note. Effluent refers to fluid which has been through a stage of separation and is regarded as at least partially voided of the nongaseous constituent and is departing the system.
  
[List of Patents for class 55 subclass 340]    340
 This subclass is indented under subclass 339.  Apparatus in which the return path for the effluent comprises a conductor arranged exteriorly of the rest of the separator apparatus.
  
[List of Patents for class 55 subclass 341.1]    341.1MULTIPLE BAG TYPE FILTERS IN CHAMBER:
 This subclass is indented under the class definition.  Apparatus having a plurality of bag type filters (with fluid flow ingress or egress means) located within a chamber.

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361+,for flexible or collapsible bags.
  
[List of Patents for class 55 subclass 341.2]    341.2Gas flow from inside to outside of filter:
 This subclass is indented under subclass 341.1.  Apparatus in which the direction of gas flow is from inside to outside of the bag type filters.
  
[List of Patents for class 55 subclass 341.3]    341.3Modular compartments:
 This subclass is indented under subclass 341.2.  Apparatus in which the chamber includes means which divide the chamber into a plurality of compartments in such a manner that each compartment has a wall common to an adjacent compartment and communication between adjacent compartments is inhibited.
  
[List of Patents for class 55 subclass 341.4]