PTO Manual of Classification for US patents

PTO Manual of Classification for US patents

What follows are the subclasses from one class of the Manual of Classification for US patents. As you scroll through the list and encounter a class/subclass of interest, you can jump back to the top and retrieve patent titles by entering the class/subclass in the box below.


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363-131 121-55A 14-.5
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Class Number: 209
 Class Title: CLASSIFYING, SEPARATING, AND ASSORTING SOLIDS

Subclass  Subclass
Number    Title

  1       MISCELLANEOUS
  2       SPECIAL APPLICATIONS
  3       PRECEDENT PREPARATION OF ITEMS OR MATERIALS TO FACILITATE
           SEPARATION
  3.1     .Sorting special items or sorting by methods or apparatus
            includible in subclasses 509 through 707
  3.2     ..Condition responsive sensor controlling preparation
  3.3     ..Marking or tagging item
  4       .Selective differentiation
  5       ..Deflocculation and flocculation
  7       ..Form
  8       ..Magnetizing and demagnetizing
  9       ..Surface
  10      TREATMENT SUBSEQUENT
  11      WITH HEAT TREATMENT
  12      COMBINED OPERATIONS
  13      .Aqueous suspension, sifting and stratifying
  14      .Mercurial adhesion, sifting and stratifying
  15      .Fluid suspension and mercurial suspension or adhesion
  16      ..Aqueous suspension
  17      .Aqueous suspension and sifting
  18      .Aqueous suspension and stratifying
  19      .Gaseous suspension, sifting and stratifying
  20      .Gaseous suspension and stratifying
  21      .Gaseous suspension and sifting
  22      ..Coincident
  23      ...With deposition
  24      ...Horizontal current
  25      ....With depositionent
  26      ...Inclined current
  27      ....With deposition
  28      ...Vertical current
  29      ....With deposition
  30      ..Successive
  31      ...With deposition
  32      ...Horizontal current
  33      ....With deposition
  34      ...Inclined current
  35      ....With deposition
  36      ...Vertical current
  37      ....With deposition
  38      .Magnetic and sifting
  39      .Magnetic and fluid suspension
  40      .Magnetic and stratifying
  41      .Mercurial suspension and mercurial adhesion
  42      .Mercurial adhesion or suspension and sifting
  43      .Mercurial adhesion or suspension and stratifying
  44      .Sifting and stratifying
  44.1    .Including sorting of special items or sorting by methods
            or apparatus includible in subclasses 509 through 707
  44.2    ..Fluid jet
  44.3    ..Drum-type sifterr
  45      ADHESION
  46      .With selective differentiation
  47      ..Coating
  48      ...Mercurial (i.e., amalgamators)
  49      .Coated surface or mass
  50      ..Mercurial
  51      ...Applying or removing coat
  52      ...Contact elements
  53      ....Agitators
  54      ....Baffles
  55      ....Disks and spheres
  56      ....Liners
  57      ....Percolators
  58      ...Receivers
  59      ....Rotating
  60      .....Centrifugal
  61      .....Cylinders, external
  62      .....Cylinders, internal
  63      .....Endless belt
  64      ....Shaking
  65      ....With agitating or conveying
  66      .....Fluid
  67      .....With rubbing
  68      .....Impact
  69      .....Reciprocating
  70      .....Rotating
  127.1   ELECTROSTATIC
  127.2   .With heating of particles
  127.3   .With vibrating trough charging of particles
  127.4   .Free fall type particle charging
  128     .Attracting and repelling
  129     .Attracting
  130     .Repelling
  131     .Stratifying
  509     SORTING SPECIAL ITEMS, AND CERTAIN METHODS AND APPARATUS (E.G.,
           POCKET TYPE AND LIGHT RESPONSIVE SORTING, ETC.) FOR SORTING ANY
           ITEMS
  510     .Sorting eggs or components thereof
  511     ..Radiant energy sensing means controls separating means
  512     ..By weight
  513     ...Sensing egg weight and controlling separating means in
              accordance therewith
  514     ...Orbiting or rotating carrier responsive to egg weight
  515     ....Carrier tilted by means (e.g., trip, cam, etc.) adjacent
               travel path when depressed to particular elevation
  516     ...Same eggs successively placed on means (e.g., balance beams,
              etc.) responsive to different weights
  517     .Sorting lumber, logs, pipes, rails, or like items
  518     ..Condition responsive means controls separating means
  519     ...Relatively movable calipers closed against item
  520     ...Sensor responsive to item contact
  521     ..With endless conveyer belt
  522     .Sorting bottles, ampoules, jars, drinking vessels, or like
            ceramic or glass containers
  523     ..Condition responsive means controls separating means
  524     ...Sensing radiant energy reflected, absorbed, emitted, or
              obstructed by item or adjunct (e.g., label, cap, etc.)
              thereoff
  525     ....Sizing with visible light beam
  526     ....Detecting internal flaw (e.g., air bubble, crack, etc.) in
               wall of item
  527     .....By means of radio frequency radiation
  528     ....Detecting flaw in, or absence or misplacement of, label on
               item
  529     ...Sensing position, shape, or presence of closure
  530     ...Sensor contacts item
  531     ....Gauge
  532     .....Plug
  533     .....Relatively movable calipers closed against item
  534     .Sorting paper money
  535     .Sorting cigarettes, cigars, or packages thereof
  536     ..Sensing radiant energy reflected, absorbed, emitted, or
             obstructed by item or adjunct thereof
  537     ..Fluid or vacuum sensing means controls separating means
  538     .Nonconveying driven means for turning item at separating or
            inspecting station to facilitate sorting
  539     .Traveling items shifted to form line, or into end or edge
            alignment, to facilitate inspection or separation
  540     .Traveling item turned to predetermined position
  541     ..Plural orienting means
  542     ..Reciprocable or pivotable orienting means
  543     ..Fluid orienting means
  544     ..Means orienting item moved by gravity
  545     ..Driven orienting means
  546     .Signalling, indicating, or display means
  547     ..Indicia associated with cards, file folders, or like coded
             items, or with sorting means therefor (including cards per se
             with edge coding)
  548     ..Operation of apparatus stopped
  549     ..Signal lamp or audible alarm
  550     ..Indicating scale
  551     ..Item counter
  552     .Condition responsive means controls separating means
  553     ..Cards or sheets separated by rotatable suction drum
  554     ..Sorting cards or sheets coded by perforations
  555     ..Diverse
  556     ...Diverse electrical tests
  557     ...Including noncondition-responsive separating means
  558     ...At single station
  559     ..Means (e.g., information storing device, timer, delaying
             relay, etc.) delaying actuation of separating means
  560     ...Mechanical
  561     ....Rotatable pin carrier
  562     ...Magnetic
  563     ....Electrical
  564     .....Electronic
  565     ......Shift register
  566     .......Controlled by article
  567     ..Magnetic test sensing property of item
  568     ...Magnetic core tested
  569     ...Reading indicia
  570     ...Permeability
  571     ..Electrical test sensing property of item
  572     ...Detecting flaw in dielectric
  573     ...Electrical component tested
  574     ....Resistor or capacitorr
  575     ....Lamp or battery
  576     ..Sensing radiant energy reflected, absorbed, emitted, or
             obstructed by item or adjunct thereof
  577     ...Infrared, visible light, or ultraviolet
  578     ....Ultraviolet
  579     ....Laser
  580     ....Color detection
  581     .....Intensity
  582     ......Measuring ratio of sensed intensities
  583     ....Reading indicia
  584     .....On mail
  585     ....Mirror or prism in optical path
  586     ....Sizing
  587     ....Reflected from item
  588     ....Transmitted through item
  589     ...X-ray or gamma ray
  590     ...Sonic or supersonic energy
  591     ..Sensing by applying fluid or vacuum to item
  592     ..Responsive to weight of item
  593     ...Detecting movement of item support with electrical sensor
  594     ....Photodetector
  595     ....Switch
  596     ...Pusher or deflector controls movement of item on separate
              support
  597     ..Sensing position, shape, or presence of closure or end wall on
             container
  598     ..Sensing contour of item having no missing parts
  599     ..Sorting items according to susceptibility to deform (e.g.,
             malleability, hardness, compressibility, etc.), rupture, or
             vibrate
  600     ..Sensor contacts item
  601     ...Gauge
  602     ....Relatively movable calipers closed against item
  603     ....Sheet gauging
  604     ....Sensor generates electrical signal
  605     .....Items separated into at least three classes
  606     .Separating means
  607     ..Corn silk separator
  608     ..Sorting items according to edge coding
  609     ...Magnet attracts or repels item
  610     ...Keyboard control
  611     ...Cards, file folders, or like items sorted by means of
              necked-down notch thereon
  612     ...Cards, file folders, or like items alternatively having notch
              or hole at particular location thereon
  613     ..Sorting cards, file folders, or like items having coded
             sorting holes
  614     ..Hand supported implements
  615     ..Brush, flail, or rake used other than as one of opposed pair
             of gauge elements to separate, or to facilitate separation of,
             items
  616     ...Rotatable
  617     ..Item gripped between opposed elements
  618     ...Rollers
  619     ..Gauge enters hole in item
  620     ..Gauging passage between orbiting belts
  621     ..Rotating or orbiting carrier having expandable gauging passage
             passing items of different size at different points alongg
             carrier travel path
  622     ...Belt
  623     ....With gauging pocket for individual item
  624     .....Pocket formed by rollers, disks, or wheels spaced
                transversely of belt or by contoured transverse roller,
                bar, or slat
  625     ..Gauge with clearer other than continuous feeder
  626     ...Spacing between gauge elements increased to free item
  627     ...Rotatable or pivotable clearer
  628     ...Stationary clearer
  629     ..Diverse
  630     ...Including means supporting items for manual sorting or
              allowing operator to control item destination
  631     ...Including separation effected by items following different
              trajectories through space
  632     ...Including separation effected by item of particular size
              passing through gauging passage between separate elements
  633     ....Stationary elements
  634     ...Including separation effected by item of particular size
              passing through gauging aperture in wall (e.g., perforated
              panel, etc.)
  635     ...Including separation effected by different items traveling in
              different directions while contacting a surface
  636     ..Magnet attracts or repels item
  637     ..Items thrown or falling through space strike surface and only
             some rebound
  638     ..Items separate by following different trajectories through
             space
  639     ...Fluid jet changes trajectory of item
  640     ...Items thrown or falling through space strike surface and
              rebound with different trajectories
  641     ...Takeoff ramp adjustable to different angular positions
              relative to horizontal plane
  642     ...Thrower
  643     ..Suction
  644     ..Fluid jet
  645     ..Sorting items by weight
  646     ...Orbiting or rotating carrier responsive to item weight
  647     ....Counterbalance on balance beam moved until beam tilts to
               item discharging position
  648     ....Carrier tilted by means (e.g., trip, cam, etc.) adjacent
               travel path when depressed to particular elevation
  649     ...Same items successively placed on means (e.g., balance beams,
              etc.) responsive to different weights
  650     ...Item support swings about fixed horizontal axis to discharge
              at different vertically spaced points
  651     ..Pusher moving item on separate surface
  652     ...Pivotable
  653     ...Reciprocable
  654     ...Rotatable
  655     ..Gravity-type conveyer (e.g., chute, etc.) movable between
             different discharge positions
  656     ..Movement of items along different paths controlled by passive
             deflector
  657     ...Deflector movable into and out of path of item
  658     ...Deflector spaced above conveying means to pass item of
              particular size thereunder
  659     ..Sorting items by sizee
  660     ...Item of particular size passed through gauging passage
              between separate elements
  661     ....Gauging passage between stationary element (e.g., bar, slat,
               etc.) and orbiting belt
  662     ....Gauging passage between stationary element (e.g., bar, slat,
               etc.) and roller
  663     ....Gauging passage between orbiting belt and roller or wheel
  664     ....Gauging passage between elements of rotating cage
  665     ....Gauging passage between elements of orbiting belt
  666     ....Item moves along curved gauging passage
  667     ....Gauging passage between rotatable elements
  668     .....Element adjustable to change width of gauging passage
  669     .....Helical roller
  670     .....Items move longitudinally of gauging passage varying in
                width along length thereof
  671     .....Spindle or roller having projecting elements spaced
                circumferentially thereof
  672     .....Spindle or roller having axially spaced, flat-sided
                circumferential elements (e.g., flanges, disks, wheels,
                etc.) projecting therefrom
  673     .....Cylindrical rollers
  674     ....Gauging passage between moving elements (e.g., vibrating
               bars, slats, etc.)
  675     ....Gauging passage between stationary elements (e.g., bars,
               slats, etc.)
  676     .....Element adjustable to change width of gauging passage
  677     .....Items move longitudinally of elongate elements
  678     ......With means moving, or regulating movement of, items along
                 elements
  679     ......Width of gauging passage varies
  680     ...Item of particular size passed through gauging aperture in
              wall (e.g., perforated panel, etc.)
  681     ....Aperture in orbiting belt
  682     ....Aperture in chute or trough
  683     ....Aperture in circumferential wall of hollow body (e.g., tube,
               etc.) rotatable about longitudinal axis thereof
  684     ...Item of particular size or shape enters pocket
  685     ....On orbiting belt
  686     ....On exterior of drumlike body (e.g., roller, etc.) rotatable
               about longitudinal axis thereof
  687     ....On interior of hollow drumlike body (e.g., tube, etc.)
               rotatable about longitudinal axis thereof
  688     ..Means pierces, or enters preformed hole in, item
  689     ..Items separate by traveling in different directions while
             contacting drumlike body (e.g., roller, hollow cylinder, etc.)
             turning about longitudinal axis thereof
  690     ...Items travel circumferentially and longitudinally of turning
              axis
  691     ..Items separate by traveling in different directions while
             contacting same inclined surface of moving support
  692     ...Items contact inclined reach of orbiting belt
  693     ....Item separating reach inclined only in direction of belt
               movement
  694     ...Translating support
  695     ..Items separate by traveling in different directions while
             contacting same horizontal surface of moving support
  696     ..Items separate by traveling in different directions while
             contacting same inclined surface of static supportt
  697     ...Helical ramp
  698     ..Means movable between horizontal item-supporting position and
             gravity discharge position
  699     ..Sorting items according to susceptibility to deform (e.g.,
             malleability, hardness, compressibility, etc.), rupture, or
             vibrate
  700     ..Sorting items according to roughness or adhesiveness
  701     ..Item turned while traveling
  702     ..Manual sorting
  703     ...Item supported on table or chute
  704     ....Rotated about vertical axis
  705     ...Item supported on orbiting or rotating carrier
  706     ..Specific compartment of receptacle brought into alignment with
             feed means by operator
  707     ..Items separated by tipping, rolling, or sliding off support
             under force of gravity
  132     FLUID SUSPENSION
  133     .Gaseous
  134     ..Horizontal current
  135     ...With deposition
  136     ..Inclined current
  137     ...With deposition
  138     ..Vertical current
  139.1   ...With deposition
  139.2   ....With centrifugal feed distribution
  140     ...Expanding
  141     ....With deposition
  142     ..Grading deposition
  143     ...With deflection
  144     ....Vortical
  145     ..Impetus and countercurrent
  146     ..Feeding
  147     ...Conveyer
  148     ....Centrifugal
  149     ....Chute
  150     ....Disk or cone
  151     ....Stepped plane
  152     ...Cylinder internal
  153     ...Tossers
  154     ..Current control
  155     .Liquid
  156     ..Horizontal current
  157     ..Inclined current
  158     ..Vertical current
  159     ...With agitation
  160     ...Expanding
  161     ....With agitation
  162     ..Floating
  163     ...Buoyant material
         ....Bubbles
  164     .....Processes
  165     ......Preferential
  166     ......With modifying agents
  167     .......Preferential
  168     .....Apparatus
  169     ......Agitating
  170     ......Pneumatic
  171     ....Oill
  172     ...Gravity liquid
  172.5   ....Suspension
  173     ....Water or aqueous solution
  174     ....Metallic (i.e., amalgamators)
  175     .....Processes
  176     ......With chemical treatment
  177     .......Bath
  178     .......Ore
  179     ......With electric treatment
  180     .......Bath
  181     .......Ore
  182     ......With heat treatment
         .....Feeding and distributing
  183     ......Submerging
  184     .......Conveyer
  185     .......Vacuum
  186     .......With agitation
  187     ........Baffles
  188     ........Agitators
  189     ......Surface
  190     .......Impact
  191     .....With rubbing
  192     .....Feeding and discharging
  193     ......Bath
  194     .....Receptacles
  195     ......Reciprocating
  196     .......Chutes and tables
  197     .......With agitators
  198     ......Rotating
  199     .......Centrifugal
  200     .......With agitators
  201     ......Stationary
  202     .......Chutes and tables
  203     .......With agitators
  204     ........Reciprocating
  205     ........Rotating
  206     .....Riffles and traps
  207     ...Surface film tension
  208     ..Grading deposition
  209     ...Chronometric
  210     ...With deflection
  211     ...Vortical
  *       MAGNETIC
  212     .Diamagnetic
  213     .Paramagnetic
  214     ..Processes
  215     ..Special application
  216     ..Multiple type
  217     ..Reciprocating magnets
         ..Rotating magnets
  218     ...Belt
  219     ...Cylinder external
  220     ....Vertical axis
  221     ...Cylinder internal
  222     ...Disk
  223.1   ..Stationary magnets
  223.2   ...Cylinder external
  224     ...Cylinder internall
  225     ..With agitating or conveying
  226     ...Magnetic
  227     ....Traveling field
  228     ..Discharging
  229     ...Doffers
  230     ....Magnetic
  231     ..Feeding
  232     ...Fluid suspension
  233     SIFTING
  234     .Combined type
  235     .Special applications
  236     ..Distributing
  237     ..Material testing
  238     .With heating or cooling
  239     .With weighting
  240     .Feeding and discharging
  241     ..Conveyers
  242     ..Interconnected
  243     .Feeding
  244     ..Hoppers
  245     ...With agitators or conveyers
  246     ...Cut-offs and valves
  247     ..Conveyers
  248     ...Receptacles
  249     ....Ash pan
  250     ...Fluid
  251     ..Reversible
  252     ..Sifter movement
  253     ..Selective
  254     .Distributers or spreaders
  255     .Discharging
  256     ..Conveyers and valves
  257     ..Conveyers
  258     ..Valves
  259     ..Receptacles
  260     ..Tilting
  261     .Conveying
  262     ..Material forcing
  263     ..Material positioning
  264     ...Guides
  265     ....Imperforate sections
  266     ....Superposed
  267     ..Retarders
  268     .With liquid treatment
  269     ..Reciprocating sifters
         ..Rotating sifters
  270     ...Drum
  271     ...Disk
  272     ...Endless belt
  273     ..Stationary sifters
  274     .Concave and convex sifters
  275     ..Reciprocating
  276     ...With agitators
  277     ....Reciprocating
  278     ....Rotating
  279     ..Rotating
  280     ...With agitators
  281     ..Stationaryy
  282     ...With reciprocating agitators
  283     ...With rotating agitators
         .Drum sifters
         ..Horizontal and inclined
  284     ...Feeding or dischargingd
  285     ....Peripheral feed
  286     .....Inlets
  287     ...Reciprocating and rotating
  288     ...Rotating
  289     ....Multiple
  290     .....Concentric
  291     ......Nested
  292     .....Superposed
  293     ....With agitators and conveyers
  294     .....Lifters and deflectors
  295     .....Pneumatic
  296     .....Rotating
  297     ......Attached
  298     ......Lifters
  299     ....Lifters and beaters
  300     ...Stationary
         ..Vertical
  301     ...Reciprocating and rotating
  302     ...Reciprocating
  303     ...Rotating
  304     ....With agitators
  305     ...Stationary
  306     ....With agitators
  307     .Endless belt sifters
  308     ..With agitators
         .Plane sifters
         ..Horizontal and inclined
  309     ...Reciprocating and rotating
         ...Reciprocating
  310     ....Distorting
  311     ....Multiple
  312     .....With pneumatic treatment
  313     .....Alined
  314     .....Stepped
  315     .....Superposed
  316     ......With intermediate conveyers
  317     ......With dischargers
  318     ......With pneumatic treatment
  319     ......Attaching and adjusting
  320     ....With agitators and conveyers
  321     .....Pneumatic
  322     .....Reciprocating
  323     ......Unattached
  324     .....Rotating
  325     ....With horizontal and vertical shake
  326     .....Gyratory
  327     .....Lateral
  328     ......With impact
  329     .....Longitudinal
  330     ......With impact
         ....With horizontal shake
  331     .....Longitudinal and transverse
  332     ......Gyratoryy
  333     .....Lateral
  334     ......Impactive
  335     ......Pivoted
  336     .......With impact
  337     ......Sliding
  338     .......With impact
  339     ......Swinging
  340     .......With impact
  341     .....Longitudinal
  342     ......Sliding
  343     .......With impact
  344     ......Swinging
  345     .......With impact
  346     ....With vertical shake
  347     .....Impactive
  348     .....Pivoted
  349     ......With impact
  350     ...Rotating
  351     ....With agitators
  352     ...Stationary
  353     ....Multiple
  354     .....Stepped
  355     .....Superposed
  356     ......Zigzag
         ....With agitators
  357     .....Reciprocating
  358     .....Rotating
  359     ..Vertical
  360     ...Reciprocating
  361     ...Rotating
  362     .Spiral sifters
  363     .Elements
  364     ..Actuating
  365.1   ...Reciprocating
  365.2   ....Cam and linkage
  365.3   ....With cushioning
  365.4   ....Differential motion
  366     ....Gyrating
  366.5   .....Unbalanced weight
  367     ....Unbalanced weight
  368     ....Magnetic
  369     ...Rotating
  370     ..Bins and casings
  371     ...Adapters
  372     ...Closures
  373     ...Compartments and receptacles
  374     ...Household
  375     ....Chutes
  376     ....Hods
  377     ....Stoves and furnaces
  378     ...Venting
  379     ..Clearers
  380     ...Fluid
  381     ...Jarring
  382     ....Knockers
  383     ....Whips
  384     ...Pressers
  385     ...Wiperss
  386     ....Brush
  387     ....Reciprocating
  388     .....Brush
  389     ....Rotating
  390     .....Brush
  391     ..Mesh closures
  392     ..Dress
  393     ...Bars
  394     ....Adjusting
  395     ....Attaching
  396     ....Reciprocating
  397     ...Perforated sheet
  398     ....Adjusting
  399     ....Attaching
  400     ...Cords and wires
  401     ...Woven
  402     ....Adjusting
  403     ....Attaching
         ..Frames
  404     ...Adjusting
  405     ...Attaching
  406     ...Drum
  407     ....Sectional
  408     ...Plane
  409     ..Supports
  410     ...Axial
  411     ...Rim
  412     ...Framework
  413     ....Adjustable
  414     ....Knockdown
  415     ...Hangers and standards
  416     ...Levelers
  417     ...Manual
  418     ....Scoop
  419     ....Shovel
  420     ...Portable
  421     ....Vehicles
  422     STRATIFIERS
         .With liquid treatment
         ..Movable bed
         ...Permeable
  423     ....Constant current
  424     .....Divergent or opposite travel
  425     ....Pulsating current
  426     .....Divergent or opposite travel
  427     .....Parallel travel
  428     ...Belt
  429     ....Divergent travel
  430     ....Opposite travel
  431     ....Reciprocating support
  432     .....Divergent travel
  433     .....Opposite travel
         ...Chutes and tables
  434     ....Spiral
  435     ....Reciprocating-rotating
  436     .....Divergent or opposite travel
  437     ....Reciprocating
  438     .....Annularr
  439     ......Divergent or opposite travel
  440     .....With agitators
  441     .....Divergent travel
  442     .....Opposite travel
  443     .....Parallel travel
  444     ....Rotating
         ..Receptacles
  445     ...Reciprocating-rotating
  446     ...Reciprocating
  447     ....Manual support
  448     ....With agitators
  449     .....Reciprocating
  450     .....Rotating
         ...Rotating
  451     ....Horizontal or inclined axis
  452     .....With agitators or conveyers
  453     ....Vertical axis
         ..Stationary bed
         ...Permeable
  454     ....Constant current
  455     ....Pulsating current
  456     .....Divergent or opposite travel
  457     .....Parallel travel
  458     ...Chutes and tables
  459     ....Annular, circular or spiral
  460     ....With divergent or opposite travel
         ...Receptacles
  461     ....With agitators or conveyers
  462     .....Reciprocating
  463     .....Rotating
  464     ......Horizontal or inclined axis
  465     ......Vertical axis
         .With pneumatic treatment
         ..Movable bed
         ...Permeable
  466     ....Constant current
  467     .....Divergent or opposite travel
  468     ....Pulsating current
  469     .....Divergent or opposite travel
  470     ...Belts
  471     ...Chutes, tables, and receptacles
  472     ....Divergent or opposite travel
  473     ...Drums
         ..Stationary bed
         ...Permeable
  474     ....With constant current
  475     ....With pulsating current
  476     .....Divergent or opposite travel
  477     ..Chutes, tables, and receptacles
  478     .Magnetic
         .Movable bed
  479     ..Chutes, tables, and receptacles
  480     ...Divergent travel
  481     ...Opposite travel
  482     ..Drums
  483     .Stationary bed
  484     .Elements
  485     ..Bedss
  486     ...Permeable
  487     ..Cleaners
  488     ..Feeding and discharging
  489     ...Automatic control
  490     ..Discharging
  491     ...Automatic control
  492     ...Conveyers
  493     ...Dividers and skimmers
  494     ...Exits
  495     ....With positively operated dischargers
  496     ....Automatic control
  497     ..Feeding
  498     ...Distributing
  499     ...Regulating
         ..Fluid supply
  500     ...Liquid
  501     ....Circuit
  502     ...Pneumatic
  503     ..Operating mechanism
  504     ...Reciprocating
  505     ...Rotating
  506     ..Riffles
  507     ...Overhung
  508     ..Supports
  *       ******************************
  *       CROSS-REFERENCE ART COLLECTIONS
  *       ******************************
  900     SORTING FLAT-TYPE MAIL
  901     FROTH FLOTATION; COPPER
  902     FROTH FLOTATION; PHOSPHATE
  903     FEEDER CONVEYER HAVING OPPOSED GRIPPERS
  904     FEEDER CONVEYER HOLDING ITEM BY MAGNETIC ATTRACTION
  905     FEEDER CONVEYER HOLDING ITEM BY SUCTION
  906     PNEUMATIC OR LIQUID STREAM FEEDING ITEM
  907     MAGNETIC FEEDER
  908     ITEM FED BY FREE FALL
  909     ITEM HOLDING FEED MAGAZINE INSERTABLE IN SORTING APPARATUS
  910     FEED HOPPER
  911     FEED MEANS SUPPORTING OR GUIDING ITEM MOVING UNDER INFLUENCE OF
           GRAVITY
  912     ENDLESS FEED CONVEYER WITH MEANS FOR HOLDING EACH ITEM
           INDIVIDUALLY
  913     SCREW FEED CONVEYER
  914     DIVERSE SEQUENTIAL FEEDING STEPS
  915     CENTRIFUGAL FEEDER
  916     RECIPROCATING PUSHER FEEDING ITEM
  917     ENDLESS BELT PUSHER FEEDING ITEM
  918     SWINGING OR ROTATING PUSHER FEEDING ITEM
  919     ROTARY FEED CONVEYER
  920     VIBRATORY FEED CONVEYER
  921     RECIPROCATING OR OSCILLATING FEED CONVEYER
  922     MISCELLANEOUS FEED CONVEYERS
  923     FEED TROUGH INCLUDING AT LEAST ONE ENDLESS CONVEYER
  924     GRAVITY CONVEYER MOVING ITEM FROM SEPARATING STATION
  925     DRIVEN OR FLUID CONVEYER MOVING ITEM FROM SEPARATING STATION
  926     SILVERWARE SORTER
  927     COP SORTER
  928     CONTAINER CLOSURE SORTERR
  929     FASTENER SORTER
  930     MUNICIPAL SOLID WASTE SORTING
  931     MATERIALS OF CONSTRUCTION
  932     FLUID APPLIED TO ITEMS
  933     ACCUMULATOR RECEIVING SEPARATED ITEM
  934     MOVING ITEMS TO SORTING MEANS IN SPACED RELATION LENGTHWISE OF
           FEED PATH
  935     AMBULANT
  936     PLURAL ITEMS TESTED AS GROUP
  937     LAUNDRY SORTING
  938     ILLUMINATING MEANS FACILITATING VISUAL INSPECTION
  939     VIDEO SCANNING
  940     NONCONDITION-RESPONSIVE SORTING BY CONTOUR
  941     ITEM CARRYING BRIDGE RAISABLE TO EXPOSE DISCHARGE OPENING
  942     OPERATOR SELECTS DESTINATION OF ITEM