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.


Enter a class/subclass code here to get a list of patent titles. Use any of the following forms:
363-131 121-55A 14-.5
that is, no embedded spaces, class and subclass seperated by a dash, and any subclass letters capitalized. Currently Design Patent titles (those in the classes of the form Dxx.yy) are not retreivable.

Enter class/subclass code:


Class Number: 51
 Class Title: ABRADING

Subclass  Subclass
Number    Title

  1       MISCELLANEOUS
  2 R     MACHINES
  3       .Combined
  4       ..Scouring and polishing
  5 R     ..With nonabrading operations
  5 A     ...With work deforming
  5 B     ...Miscellaneous cutting
  5 C     ....Grinding of cut surface
  5 D     ...Dressing
  5 E     ...Drilling
  5 F     ...Adjuncts
  6       .Graining boxes
  7       .Immersion
  410     .Sandblast
  411     ..Hollow interior
  412     ..Spark plug
  413     ..Electrical device
  414     ..File
  415     ..With condition-responsive
  416     ...Cyclic control
  417     ..With moving work holder
  418     ...Endless belt type
  419     ...Rotary
  420     ....Roller
  421     ....Table
  422     ..With tumbling barrel
  423     ...Having centrifugal propulsion means
  424     ..With recovery means
  425     ...Having separation means
  426     ..With chamber
  427     ..With hand-directed nozzle
  428     ..Propulsion means
  429     ...Mobile
  430     ...Magnetic
  431     ...Mechanical
  432     ....Centrifugal batter with feed
  433     .....With power feed
  434     ..Centrifugal batter
  435     ..Blade structure
  436     ..Supply structure
  437     ...Multiple hopper
  438     ..Valve structure
  439     ..Nozzle structure
  16      .Scouring devices
  17      ..Immersion
  18      ...Roller work feed
  19      ...Rotary work holder
  20      ...Winding drum
  21      ..Reciprocating tool
  22      ..Rotary cylinder
  23      ...Opposed
  24      ..Rotary diskk
  25      ...Opposed
  26      .Without tool
  27      ..Valve and set
  28      ...Plug cock
  29      ...Puppet valve
  30      ...Slide valve
  31      .Rotary reciprocating tool
  32      ..Peripheral face
  33 R    ...Oscillating
  33 HK   ....Harvester knives
  33 W    ....Work rotating
  34 R    ...Rectilinear
  35      ....Compound
  36      ....Harvester-knife sharpeners
  37      ....One-way cut
  38      ....One-way work traverse
  39      .....Roller work feed
  40      ....Opposed
  41      .....Reciprocating work holder
  42      .....Work rotating
  43      ....Planetary
  44      ....Reciprocating work holder
  45      .....Rectilinear
  46      .....Rocking
  47      ....Swinging tool carrier
  48 R    ....Work rotating
  49      .....Roll grinders
  50 R    .....Rotary work holder
  51      ......Disk and wheel grinders
  52 R    ......Gear grinders
  52 HB   .......Hobbing
  53      ......Turret
  50 H    ......Hydraulic
  50 PC   ......Pattern control
  48 HE   .....Helical
  34 A    ....Templet
  34 BR   ....Razor blades and blade reversing
  34 C    ....Reciprocating carriage
  34 D    .....Fluid pressure actuated
  34 E    .....Screw and nut actuated
  34 F    .....Flexible actuator
  34 G    .....Rack and pinion actuated
  34 H    ....Reciprocating spindle
  34 J    .....Fluid pressure actuated
  34 K    .....Cam and follower actuated
  54      ..Radial face
  55      ...Oscillating
  56 R    ...Rectilinear
  56 G    ....Gear grinder
  57      .Reciprocating tool
  58      ..Oscillating
  59 R    ..Rectilinear
  60      ...Compound
  61      ...Endless work carrier
  62      ...Flexible
  63      ....Stropping machines
  64      ...Reciprocating work holder
  65      ....Rockingg
  66      ...Roller work feed
  67      ...Rotary work holder
  68      ...Swinging tool carrier
  69      ....Actuating handle
  70      ...Winding drum
  59 SS   ...Supersonic
  71      .Rotary tool
  72 R    ..Peripheral face
  73 R    ...Internal
  73 GC   ....Grinding crankpins
  74 R    ...One-way traverse
  75      ....Drawing reel
  76 R    ....Endless work carrier
  76 BS   .....Blade sharpeners
  77 R    ....Nut and screw
  77 BS   .....Blade sharpeners
  78      ....Roller work feed
  79      .....Work rotating
  74 BS   ....Blade sharpeners
  80 R    ...Opposed
  81 R    ....Alternating tool
  81 BS   .....Blade sharpeners
  82 R    ....Plunger feed
  82 BS   .....Blade sharpeners
  83 R    ....Reciprocating work holder
  84 R    .....Rectilinear
  85 R    ......Rocking
  85 BS   .......Blade sharpeners
  84 BS   ......Blade sharpeners
  86 R    .....Rocking
  86 BS   ......Blade sharpeners
  83 BS   .....Blade sharpeners
  87 R    ....Roller work feed
  87 BS   .....Blade sharpeners
  88      ....Work rotating
  89      .....Rotary work holder
  80 A    ....One-way work traverse
  80 B    .....Razor blades
  80 BS   ....Blade sharpeners
  90      ...Planetary
  91 R    ...Reciprocating work holder
  92 R    ....Rectilinear
  93      .....Compound
  94 R    .....Rocking
  94 CS   ......Hobs, tops, and fluted threads
  95 R    .....Work rotating
  95 GH   ......Gear forming or hobbing
  95 LH   ......Long helix
  95 WH   ......Rotary work holder
  95 TG   ......Thread grinder
  92 BS   .....Blade sharpeners
  92 HK   .....Harvester knives
  92 ND   .....Indexing
  96      ....Rocking
  97 R    .....Work rotating
  97 NC   ......Noncircular cross section
  91 BS   ....Blade sharpeners
  91 HK   ....Harvester knivess
  98 R    ...Stationary work holder
  98.5    ....Reversing, obverting or pivoting
  98 BS   ....Blade sharpeners
  98 SP   ....Spaced portions
  98 HK   ....Harvester knives
  99      ...Swinging tool carrier
  100 R   ...Templet
  101 R   ....Rotary
  101 LG  .....Lens grinders
  100 P   ....Pantograph
  102     ...Work guide
  103 R   ...Work rotating
  104     ....Disk and wheel grinders
  105 R   ....Rotary work holder
  106 R   .....Disk and wheel grinders
  106 LG  ......Lens grinders
  107     .....Glassware ornamenting
  105 SP  .....Spaced portions
  105 HB  .....By hob
  105 EC  .....Grinding eccentric shape
  105 VG  .....Valve grinders
  105 LG  .....Lens grinders
  105 GG  .....Gear grinder
  108 R   ....Turret
  108 BS  .....Blade sharpeners
  103 C   ....With centers
  103 WH  ....Work handling
  103 TF  ....Through feed
  72 L    ...Linear indexing
  109 R   ..Radial face
  110     ...One-way traverse
  111 R   ...Opposed
  112     ....One-way work traverse
  113     ....Reciprocating work holder
  114     .....Rectilinear
  115     .....Rocking
  116     ....Work guide
  117     ....Work rotating
  118     .....Rotary work holder
  111 BR  ....Blade reversing
  119     ...Orbital
  120     ....Planetary
  121     ...Reciprocating work holder
  122     ....Rectilinear
  123 R   .....Work rotating
  123 G   ......Gear generating
  124 R   ....Rocking
  124 L   .....Lens grinders
  125     ...Stationary work holder
  125.5   ....Reversing, obverting or pivoting
  126     ...Swinging tool carrier
  127     ...Template
  128     ...Work guide
  129     ...Work rotating
  130     ....Raceway
  131.1   ....Rotary work holder
  131.2   .....By means loosely confining work
  131.3   .....Planar surface grindingg
  131.4   ......Pressure plate
  131.5   .....Having vacuum or adhesive securing means
  132     .....Disk and wheel grinders
  133     .....Planetary
  134     .....Turret
  109 BS  ...Blade sharpeners
  134.5 R ..Tool rotating
  134.5 F ...Fluid
  135 R   .Traveling band
  136     ..Chain
  137     ..One-way traverse
  138     ...Endless work carrier
  139     ...Roller work feed
  140     ..Opposed
  141     ..Pressers and formers
  142     ..Reciprocating band carrier
  143     ..Reciprocating work holder
  144     ...Work rotating
  145 R   ..Rotary work holder
  145 T   ...Turret
  146     ..Superposed
  147     ..Swinging band carrier
  148     ..Tension devices
  135 BT  ..Belt tracking
  149     .Stationary tool
  150     ..Flexible
  151     ...Reciprocating work holder
  152     ....Needle-eye polishers
  153     ....Stropping machines
  154     ...Work rotating
  155     ....Stropping machines
  156     ..Rigid
  157     ...Reciprocating work holder
  158     ....Blade sharpeners
  159     .....Blade reversing
  160     ....Lens grinders
  161     ...Rotary work holder
  162     ....Lens grinders
  163.1   .Tumbling devices
  163.2   ..About a vertical axis
  164.1   ..Drum
  164.2   ...Planetary
  164.5   ..Tumbling shapes
  165 R   .Precision devices
  165.71  ..Computer controlled
  165.72  ..Optical
  165.73  ..With temperature control means
  165.74  ..With indicating means
  165.75  ...Tool and work holder position
  165.76  ...Tool and work holder feeding means
  165.77  ..Tool and work holder feeding means
  165.78  ...With moving abutment
  165.79  ....Cam
  165.8   ...Screw actuated
  165.81  ....Manually adjustable
  165.82  ....Ratchet and pawl operated
  165.83  .....Sizing guage controlled
  165.84  .....Cam actuatedd
  165.85  .....Fluid pressure actuated
  165.86  .....Table dog actuated
  165.87  ...Tool wear compensation
  165.88  ....Sizing gauge controlled
  165.89  ...Cam actuated
  165.9   ...Fluid pressure actuated means
  165.91  ....Sizing gauge controlled
  165.92  ....Control means near and parallel to the grinder
  165.93  ...Tool interior of workpiece
  165 TP  ..Tape controlled
  2 A     .Operative cycles
  2 B     .Machine control
  2 C     ..Automatic stops
  2 D     ..Common control
  2 E     ...Manual actuation
  2 F     ..Truing tool
  2 G     ..Tool and workholder
  2 H     ...Placing, displacing and feeding
  2 J     ....Cam control
  2 K     ....Fluid pressure actuated
  2 L     .....Moving abutment
  2 M     ...Placing and displacing
  2 N     ....Counter control
  2 P     ....Displacing cam
  2 Q     .....Placing spring and weight
  2 S     ....Displacing spring and weight
  2 T     .....Sizing gauge control
  2 UA    ....Fluid pressure actuated
  2 V     .....Sizing gauge control
  2 W     ....Lateral separation
  2 XA    ....Rack and pinion
  2 Y     ....Selected grinding position
  2 Z     ...Interlocks
  2 AA    ...Electronics
  166 R   FRAMES AND MOUNTS
  167     .Double treadle
  168     .Hanging grindstones
  169     ..Balancing
  170 R   .Portable
  171     ..Button cleaners
  172     ..Calk sharpeners
  173     ..Edge-tool sharpeners
  174     ..Floor-surfacing machines
  175     ...Reciprocating tool
  176     ...Rotary cylinder
  177     ...Rotary disk
  178     ..Rail grinders
  179     ..Roll and wheel grinders
  180     ..Wall-surfacing machines
  170 PT  ..Rotary peripheral tool
  170 T   ..Rotary radial tool
  170 TL  ..Reciprocating tool
  170 EB  ..Endless band tool
  170 MT  ..Orbital motion tool
  166 TS  .Tool supporter
  166 FB  ..Floor and bench stands
  166 MH  ..Machine heads
  166 T   ..Turrett
  181 R   TOOLS, COMBINED
  181 NT  .Internal
  330     CARRIER FOR RELATIVELY MOVABLE SIMULTANEOUSLY USABLE TOOLS
  331     .For radially movable tools
  332     ..Centrifugal force urged tools
  334     ...Flexible flail tools
  335     ....With tool supply or storage
  336     ....Including self-sustaining tools
  337     .....With discrete non-destructible tool-securing means
  338     ..Including taper or wedge tool-moving surface(s)
  339     ...With threaded operator
  340     ....To move conoid surface(s)
  341     .....To actuate pivotally mounted tools
  342     .....For movement of conoid members relative to each other
  343     .....By conoid member(s) with screw threads
  344     .....Including plural conoid surfaces
  345     ....Inclined keyways or splines
  346     ...Conoid surface(s)
  347     ..Including gear-actuated tool-mover
  348     ..Including lever-actuated tool-mover
  349     ..Including fluid-pressure-actuated tool-mover
  350     ..Including thread-actuated tool-mover
  351     ...Interrelated to move plural tools
  352     ..Including resiliently urged tool
  353     ...By coil spring
  354     .Including tools resiliently urged toward work
  355     CARRIER FOR A RADIALLY MOVABLE TOOL
  356     VENTILATION OR COOLING OF TOOL OR SUPPORT
  357     FLEXIBLE-MEMBER TOOL MOUNTED ON PLURAL ROLLS
  358     TOOL SUPPORT FOR FLEXIBLE-MEMBER TOOL
  359     .With tool supply or storage
  360     ..Coiled tool
  361     ...On spool or axle
  362     .Magnetic or suction holding means
  363     .Contour-adjustable support
  364     .Including tool-holding slot(s) in rotary support
  365     ..Separable along slot
  366     ...Diametrically separable
  367     ..With tool-tensioning means
  368     ...By rotary gripping element
  369     ...Including threaded element
  370     .Including longitudinal tool-holding slot
  371     ..Separable along slot
  372     .Including expansible external surface
  373     ..Fluid actuated
  374     ..Centrifugally actuated
  375     ..Actuated by compression of support
  376     .Including headed, axially-disposed, tool-holding member on
            rotary support
  377     ..With member-retaining means disconnected by partial rotation
  378     ..With threaded means to retain member
  379     ...Including conical tool-engaging member
  380     .Including taper or wedge
  381     .Including endless band
  382     .Including resiliently urged tool-securing means
  383     ..Separable
  384     ..Rotatable
  385     ..Biased for tool disengagementt
  386     ..Cantilever-spring actuated
  387     ..Coil-spring actuated
  388     .Including tool-holder having tool-surface depressor
  389     .Including threaded means to retain tool-holder
  390     ..Including bar or plate
  391     .Manually manipulated
  392     ..By handle
  393     ...Detachable from support
  394     FLEXIBLE-MEMBER TOOL PER SE
  395     .Interrupted or composite (e.g., cracked, non-planar, etc.) work
            face
  396     ..Uniform thickness non-planar
  397     ..Sectional
  398     .Work face variegated or on projecting backing
  399     .Splice or joint
  400     .Comprising fibers
  401     .Laminate
  402     ..Discontinuous or differential coating impregnation or bond
  403     ..Coil wound
  404     ..Interengaged strands
  405     ..Non co-extensive laminae
  406     ..Strippable layer or component
  407     ..Abrasive on one surface only
  204     TOOL, RIGID
  205 R   .Actuating handle
  205 WG  ..Work guide
  206 R   .Rotary cylinder
  206.4   ..Circular segments
  206.5   ...Detachable
  207     ..Laminated
  208     ..Work guide
  206 NF  ..Reinforced
  206 P   ..Ribbed periphery
  209 R   .Rotary disk
  210     ..Work guide
  209 DL  ..Disc laps
  209 S   ..Scrolls
  211 R   .Stationary
  212     ..Metal
  213     ..Oilers and moisteners
  214     ..Work guide
  211 H   ..Razor hones
  215 R   WORK FEEDERS
  215 AR  .Rotary
  215 HM  ..With hopper and magazine
  215 CP  .Reciprocating
  215 H   ..With hopper and magazine
  215 E   .Endless
  215 M   ..With hopper and magazine
  215 SF  .Skewed feed rollers
  215 UE  .Ejectors and unloaders
  216 R   WORK HOLDERS
  217 R   .Clamp
  218 R   ..Edge tool
  219 R   ...Drill
  219 PC  ....Pattern control
  220     ...Gauging devices
  221 R   ....Portablee
  221 BS  .....Blade sharpeners
  222     ...Harvester knife
  223     ....Suspension
  224     ...Reciprocating
  225     ...Rotary cutter
  226     ...Seat controlled
  218 A   ...Angular
  218 P   ...Portable
  218 T   ...Rotary
  227 R   ..Hollow work
  227 H   ...Hypodermic needle
  228     ..Skate
  217 P   ..Portable
  217 T   ..Rotary
  217 A   ..Angular
  217 S   ..Oscillating
  217 L   ..Lens holder
  229     .Dops and sticks
  230     .Reciprocating
  231     ..Rectilinear
  232     ...Work rotating
  233     ...Fluid-pressure actuated
  234     ..Rocking
  235     .Vacuum
  236     .Work rotating
  237 R   ..Rotary work holder
  237 M   ...Orbital movement
  237 CS  ...Crank shaft
  237 T   ...Turret
  216 LP  .Lens, prism and jewel block
  216 A   .Angle
  216 T   .Rotary
  216 P   .Portable
  216 ND  .Indexing
  216 H   ..Hand operated
  238 R   WORK RESTS
  239     .Gauging devices
  238 S   .Steady rests
  238 GG  ..Centerless grinder rests
  238 T   ..Tool rests
  240 R   WORK TABLES
  240 T   .Rotary
  240 A   .Angular
  240 GB  .Glass supports
  241 R   ATTACHMENTS
  242     .Card grinders
  243     ..Flats
  244     .Commutator grinders
  245     .Internal grinders
  246     .Machine knife sharpeners
  247     ..Rotary tool
  248     ...Work actuated
  249     ..Rotary reciprocating tool
  250     ..Stationary tool
  251     .Roll and wheel grinders
  252     ..Reciprocating tool
  253     ...Nut and screw
  254     ..Rotary reciprocating tooll
  255     ..Stationary tool
  256     .Sewing machine
  257     ..Flywheel
  258     .Vehicle
  259     .Lathe
  260     ..Center grinders
  261     ..Internal grinders
  241 G   .Work guide
  241 LG  .Rail grinders
  241 S   .Mounted on the work
  241 B   .Orbital
  241 VS  .Valve and seat grinders
  241 A   ..Orbital
  262 R   ACCESSORIES
  262.1   .Erasing shield
  263     .Abradant supplying
  264     ..Graders
  265     .Button-cleaning shields
  266     .Cooling
  267     ..Wetting grindstones
  268     .Guards and housings
  269     ..Breakage guards
  270     ..Collectors
  271     ..Drive shields
  272     ..Spark and splash guards
  273     ..Suction
  274     ..Work guards
  275     .Sheet-applying devices
  276     .Strop-surface renewing
  277     .Work-mounting devices
  262 T   .Truing
  262 A   .Tool cleaners
  281 R   ABRADING PROCESSES
  310     .Utilizing shield (mask or stencil)
  311     ..With in situ removal of nonresist portion
  312     ..With preparation of shield
  313     .Utilizing tumbling operation
  314     ..Including temperature modification or control
  315     ..In at least one of plural abrading steps
  316     ..With auxiliary work treatment or in critical fluent medium
  317     .Utilizing fluent abradant
  318     ..At least once in plural distinct abrading areas or steps
  319     ..By blasting
  320     ...With nonsiliceous abradant
  321     ...With nonatmospheric fluid carrier
  283 R   .Glass and stone grinding
  284 R   ..Lens
  284 E   ...Edging
  283 E   ..Edging
  285     .Razor, knife and scissors sharpening
  286     .Gauge grinding
  287     .Gear and worm grinding
  288     .Drill, thread, thread cutter, reamer and rotary cutter
            grinding
  289 R   .Roll, roller, shaft, ball and piston grinding
  289 S   ..Ball grinding
  290     .Ring, tube, bushing, sleeve and cylinder grinding
  291     ..Bearing racewayss
  322     .With critical temperature modification or control of work or
            abradant
  323     .With critical nonabrading work treatment
  324     ..Including deformation
  325     .With tool treating or forming
  326     .With plural distinct abrading areas or steps
  327     ..Utilizing mounted rigid grinding tool only
  328     .Utilizing nonrigid tool
  292     .Abrasive supplying
  281 P   .Internal portion
  281 C   .Cam
  281 SF  .Side face of disc
  293     ABRASIVE TOOL MAKING PROCESS, MATERIALS AND COMPOSITIONS
  294     .Bags or filled cloth
  295     .Impregnating or coating of abrasive tools
  296     .Pore forming
  297     .Laminating
  298     .With synthetic resin
  299     .With rubber or reaction product thereof
  300     .With natural resin or reaction product thereof
  301     .With protein or reaction product thereof
  302     .With carbohydrate or reaction product thereof
  303     ..Cellulose or derivative thereof
  304     .With fats, fatty oils or fatty oil acids and salts thereof
  305     .With ester-type wax, bituminous material or tarry residues
  306     .With hydrocarbon
  307     .With inorganic materials
  308     ..Clay, silica and silicates
  309     ..Metals and metal oxides
  *       ******************************
  *       DIGESTS
  *       ******************************
  DIG 1   Gear grinders
  DIG 2   Super finish
  DIG 3   Brake grinding
  DIG 4   Egg cleaning
  DIG 5   Reel, flexible abrasive
  DIG 6   Metal laps
  DIG 7   Machine elements and units
  DIG 8   Strip feeding
  DIG 9   Electrolytic grinding
  DIG 10  Wire polishing
  DIG 11  Supersonic
  DIG 12  Mounted points
  DIG 13  Shoe
  DIG 14  Contour grinding
  DIG 15  Supporting, positioning or feed work
  DIG 16  Wheel speed control
  DIG 17  Brush bristle grinding
  DIG 18  Bread knife
  DIG 31  Sine bar
  DIG 32  Wankel
  DIG 33  Tire "Rounding"
  DIG 34  "Pads" for lens-shaping tools