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Classification Resources

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Class Schedule (HTML) Class Schedule (PDF)
Class Definition (HTML) Class Definition (PDF)
US-to-IPC8 Concordance (HTML) US-to-IPC8 Concordance (PDF)
US-to-Locarno Concordance

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Class Number and Title
  004Baths, closets, sinks, and spittoons
  007Compound tools
  008Bleaching and dyeing; fluid treatment and chemical modification of textiles and fibers
  012Boot and shoe making
  015Brushing, scrubbing, and general cleaning
  016Miscellaneous hardware (e.g., bushing, carpet fastener, caster, door closer, panel hanger, attachable or adjunct handle, hinge, window sash balance, etc.)
  019Textiles: fiber preparation
  023Chemistry: physical processes
  024Buckles, buttons, clasps, etc.
  026Textiles: cloth finishing
  028Textiles: manufacturing
  029Metal working
  033Geometrical instruments
  034Drying and gas or vapor contact with solids
  036Boots, shoes, and leggings
  038Textiles: ironing or smoothing
  040Card, picture, or sign exhibiting
  043Fishing, trapping, and vermin destroying
  044Fuel and related compositions
  047Plant husbandry
  048Gas: heating and illuminating
  049Movable or removable closures
Class Number and Title
  051Abrasive tool making process, material, or composition
  052Static structures (e.g., buildings)
  053Package making
  054Harness for working animal
  055Gas separation
  057Textiles: spinning, twisting, and twining
  059Chain, staple, and horseshoe making
  060Power plants
  065Glass manufacturing
  066Textiles: knitting
  068Textiles: fluid treating apparatus
  069Leather manufactures
  071Chemistry: fertilizers
  072Metal deforming
  073Measuring and testing
  074Machine element or mechanism
  075Specialized metallurgical processes, compositions for use therein, consolidated metal powder compositions, and loose metal particulate mixtures
  076Metal tools and implements, making
  079Button making
  086Ammunition and explosive-charge making
  087Textiles: braiding, netting, and lace making
Class Number and Title
  091Motors: expansible chamber type
  092Expansible chamber devices
  095Gas separation: processes
  096Gas separation: apparatus
  099Foods and beverages: apparatus
  102Ammunition and explosives
  105Railway rolling stock
  106Compositions: coating or plastic
  108Horizontally supported planar surfaces
  109Safes, bank protection, or a related device
  116Signals and indicators
  117Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
  118Coating apparatus
  119Animal husbandry
  122Liquid heaters and vaporizers
  123Internal-combustion engines
  124Mechanical guns and projectors
  125Stone working
  126Stoves and furnaces
  127Sugar, starch, and carbohydrates
Class Number and Title
  134Cleaning and liquid contact with solids
  135Tent, canopy, umbrella, or cane
  136Batteries: thermoelectric and photoelectric
  137Fluid handling
  138Pipes and tubular conduits
  139Textiles: weaving
  141Fluent material handling, with receiver or receiver coacting means
  142Wood turning
  148Metal treatment
  149Explosive and thermic compositions or charges
  150Purses, wallets, and protective covers
  152Resilient tires and wheels
  156Adhesive bonding and miscellaneous chemical manufacture
  157Wheelwright machines
  159Concentrating evaporators
  160Flexible or portable closure, partition, or panel
  162Paper making and fiber liberation
  163Needle and pin making
  164Metal founding
  165Heat exchange
  169Fire extinguishers
  171Unearthing plants or buried objects
Class Number and Title
  172Earth working
  173Tool driving or impacting
  174Electricity: conductors and insulators
  175Boring or penetrating the earth
  177Weighing scales
  180Motor vehicles
  182Fire escape, ladder, or scaffold
  185Motors: spring, weight, or animal powered
  187Elevator, industrial lift truck, or stationary lift for vehicle
  190Trunks and hand-carried luggage
  191Electricity: transmission to vehicles
  192192 clutches and power-stop control
  193Conveyors, chutes, skids, guides, and ways
  194Check-actuated control mechanisms
  196Mineral oils: apparatus
  198Conveyors: power-driven
  199Type casting
  200Electricity: circuit makers and breakers
  201Distillation: processes, thermolytic
  202Distillation: apparatus
  203Distillation: processes, separatory
  204Chemistry: electrical and wave energy
  205Electrolysis: processes, compositions used therein, and methods of preparing the compositions
  206Special receptacle or package
Class Number and Title
  208Mineral oils: processes and products
  209Classifying, separating, and assorting solids
  210Liquid purification or separation
  211Supports: racks
  212Traversing hoists
  213Railway draft appliances
  215Bottles and jars
  216Etching a substrate: processes
  217Wooden receptacles
  218High-voltage switches with arc preventing or extinguishing devices
  219Electric heating
  221Article dispensing
  223Apparel apparatus
  224Package and article carriers
  225Severing by tearing or breaking
  226Advancing material of indeterminate length
  227Elongated-member-driving apparatus
  228Metal fusion bonding
  229Envelopes, wrappers, and paperboard boxes
  231Whips and whip apparatus
  232Deposit and collection receptacles
  234Selective cutting (e.g., punching)
  236Automatic temperature and humidity regulation
  237Heating systems
  238Railways: surface track
  239Fluid sprinkling, spraying, and diffusing
Class Number and Title
  241Solid material comminution or disintegration
  242Winding, tensioning, or guiding
  244Aeronautics and astronautics
  245Wire fabrics and structure
  246Railway switches and signals
  249Static molds
  250Radiant energy
  251Valves and valve actuation
  254Implements or apparatus for applying pushing or pulling force
  257Active solid-state devices (e.g., transistors, solid-state diodes)
  258Railway mail delivery
  260Chemistry of carbon compounds
  261Gas and liquid contact apparatus
  264Plastic and nonmetallic article shaping or treating: processes
  266Metallurgical apparatus
  267Spring devices
  269Work holders
  270Sheet-material associating
  271Sheet feeding or delivering
  273Amusement devices: games
  277Seal for a joint or juncture
  278Land vehicles: animal draft appliances
  279Chucks or sockets
  280Land vehicles
  281Books, strips, and leaves
Class Number and Title
  283Printed matter
  285Pipe joints or couplings
  289Knots and knot tying
  290Prime-mover dynamo plants
  291Track sanders
  292Closure fasteners
  293Vehicle fenders
  294Handling: hand and hoist-line implements
  295Railway wheels and axles
  296Land vehicles: bodies and tops
  297Chairs and seats
  298Land vehicles: dumping
  299Mining or in situ disintegration of hard material
  300Brush, broom, and mop making
  301Land vehicles: wheels and axles
  303Fluid-pressure and analogous brake systems
  305Wheel substitutes for land vehicles
  307Electrical transmission or interconnection systems
  310Electrical generator or motor structure
  312Supports: cabinet structure
  313Electric lamp and discharge devices
  314Electric lamp and discharge devices: consumable electrodes
  315Electric lamp and discharge devices: systems
  318Electricity: motive power systems
  320Electricity: battery or capacitor charging or discharging
  322Electricity: single generator systems
  323Electricity: power supply or regulation systems
  324Electricity: measuring and testing
  326Electronic digital logic circuitry
Class Number and Title
  327Miscellaneous active electrical nonlinear devices, circuits, and systems
  333Wave transmission lines and networks
  335Electricity: magnetically operated switches, magnets, and electromagnets
  336Inductor devices
  337Electricity: electrothermally or thermally actuated switches
  338Electrical resistors
  340Communications: electrical
  341Coded data generation or conversion
  342Communications: directive radio wave systems and devices (e.g., radar, radio navigation)
  343Communications: radio wave antennas
  345Computer graphics processing and selective visual display systems
  347Incremental printing of symbolic information
  349Liquid crystal cells, elements and systems
  351Optics: eye examining, vision testing and correcting
  352Optics: motion pictures
  353Optics: image projectors
  356Optics: measuring and testing
  358Facsimile and static presentation processing
  359Optical: systems and elements
  360Dynamic magnetic information storage or retrieval
  361Electricity: electrical systems and devices
Class Number and Title
  363Electric power conversion systems
  365Static information storage and retrieval
  367Communications, electrical: acoustic wave systems and devices
  368Horology: time measuring systems or devices
  369Dynamic information storage or retrieval
  370Multiplex communications
  372Coherent light generators
  373Industrial electric heating furnaces
  374Thermal measuring and testing
  375Pulse or digital communications
  376Induced nuclear reactions: processes, systems, and elements
  377Electrical pulse counters, pulse dividers, or shift registers: circuits and systems
  378X-ray or gamma ray systems or devices
  379Telephonic communications
  381Electrical audio signal processing systems and devices
  382Image analysis
  383Flexible bags
  385Optical waveguides
  386Motion video signal processing for recording or reproducing
  388Electricity: motor control systems
  392Electric resistance heating devices
  398Optical communications
  400Typewriting machines
Class Number and Title
  401Coating implements with material supply
  402Binder device releasably engaging aperture or notch of sheet
  403Joints and connections
  404Road structure, process, or apparatus
  405Hydraulic and earth engineering
  406Conveyors: fluid current
  407Cutters, for shaping
  408Cutting by use of rotating axially moving tool
  409Gear cutting, milling, or planing
  410Freight accommodation on freight carrier
  411Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
  412Bookbinding: process and apparatus
  413Sheet metal container making
  414Material or article handling
  415Rotary kinetic fluid motors or pumps
  416Fluid reaction surfaces (i.e., impellers)
  418Rotary expansible chamber devices
  419Powder metallurgy processes
  420Alloys or metallic compositions
  422Chemical apparatus and process disinfecting, deodorizing, preserving, or sterilizing
  423Chemistry of inorganic compounds
  424Drug, bio-affecting and body treating compositions
  425Plastic article or earthenware shaping or treating: apparatus
  426Food or edible material: processes, compositions, and products
  427Coating processes
  428Stock material or miscellaneous articles
  429Chemistry: electrical current producing apparatus, product, and process
  430Radiation imagery chemistry: process, composition, or product thereof
Class Number and Title
  434Education and demonstration
  435Chemistry: molecular biology and microbiology
  436Chemistry: analytical and immunological testing
  438Semiconductor device manufacturing: process
  439Electrical connectors
  440Marine propulsion
  441Buoys, rafts, and aquatic devices
  442Fabric (woven, knitted, or nonwoven textile or cloth, etc.)
  445Electric lamp or space discharge component or device manufacturing
  446Amusement devices: toys
  449Bee culture
  450Foundation garments
  453Coin handling
  460Crop threshing or separating
  462Books, strips, and leaves for manifolding
  463Amusement devices: games
  464Rotary shafts, gudgeons, housings, and flexible couplings for rotary shafts
  470Threaded, headed fastener, or washer making: process and apparatus
  472Amusement devices
  473Games using tangible projectile
  474Endless belt power transmission systems or components
  475Planetary gear transmission systems or components
Class Number and Title
  476Friction gear transmission systems or components
  477Interrelated power delivery controls, including engine control
  482Exercise devices
  483Tool changing
  492Roll or roller
  493Manufacturing container or tube from paper; or other manufacturing from a sheet or web
  494Imperforate bowl: centrifugal separators
  501Compositions: ceramic
  502Catalyst, solid sorbent, or support therefor: product or process of making
  503Record receiver having plural interactive leaves or a colorless color former, method of use, or developer therefor
  504Plant protecting and regulating compositions
  505Superconductor technology: apparatus, material, process
  506Combinatorial chemistry technology: method, library, apparatus
  507Earth boring, well treating, and oil field chemistry
  508Solid anti-friction devices, materials therefor, lubricant or separant compositions for moving solid surfaces, and miscellaneous mineral oil compositions
  510Cleaning compositions for solid surfaces, auxiliary compositions therefor, or processes of preparing the compositions
  512Perfume compositions
  514Drug, bio-affecting and body treating compositions
  516Colloid systems and wetting agents; subcombinations thereof; processes of
  518Chemistry: fischer-tropsch processes; or purification or recovery of products thereof
  520Synthetic resins or natural rubbers -- part of the class 520 series
  521Synthetic resins or natural rubbers -- part of the class 520 series
  522Synthetic resins or natural rubbers -- part of the class 520 series
  523Synthetic resins or natural rubbers -- part of the class 520 series
  524Synthetic resins or natural rubbers -- part of the class 520 series
  525Synthetic resins or natural rubbers -- part of the class 520 series
  526Synthetic resins or natural rubbers -- part of the class 520 series
  527Synthetic resins or natural rubbers -- part of the class 520 series
  528Synthetic resins or natural rubbers -- part of the class 520 series
Class Number and Title
  530Chemistry: natural resins or derivatives; peptides or proteins; lignins or reaction products thereof
  532Organic compounds -- part of the class 532-570 series
  534Organic compounds -- part of the class 532-570 series
  536Organic compounds -- part of the class 532-570 series
  540Organic compounds -- part of the class 532-570 series
  544Organic compounds -- part of the class 532-570 series
  546Organic compounds -- part of the class 532-570 series
  548Organic compounds -- part of the class 532-570 series
  549Organic compounds -- part of the class 532-570 series
  552Organic compounds -- part of the class 532-570 series
  554Organic compounds -- part of the class 532-570 series
  556Organic compounds -- part of the class 532-570 series
  558Organic compounds -- part of the class 532-570 series
  560Organic compounds -- part of the class 532-570 series
  562Organic compounds -- part of the class 532-570 series
  564Organic compounds -- part of the class 532-570 series
  568Organic compounds -- part of the class 532-570 series
  570Organic compounds -- part of the class 532-570 series
  585Chemistry of hydrocarbon compounds
  588Hazardous or toxic waste destruction or containment
  601Surgery: kinesitherapy
  602Surgery: splint, brace, or bandage
  607Surgery: light, thermal, and electrical application
  623Prosthesis (i.e., artificial body members), parts thereof, or aids and accessories therefor
  700Data processing: generic control systems or specific applications
  701Data processing: vehicles, navigation, and relative location
Class Number and Title
  702Data processing: measuring, calibrating, or testing
  703Data processing: structural design, modeling, simulation, and emulation
  704Data processing: speech signal processing, linguistics, language translation, and audio compression/decompression
  705Data processing: financial, business practice, management, or cost/price determination
  706Data processing: artificial intelligence
  707Data processing: database and file management or data structures
  708Electrical computers: arithmetic processing and calculating
  709Electrical computers and digital processing systems: multicomputer data transferring
  710Electrical computers and digital data processing systems: input/output
  711Electrical computers and digital processing systems: memory
  712Electrical computers and digital processing systems: processing architectures and instruction processing (e.g., processors)
  713Electrical computers and digital processing systems: support
  714Error detection/correction and fault detection/recovery
  715Data processing: presentation processing of document, operator interface processing, and screen saver display processing
  716Computer-aided design and analysis of circuits and semiconductor masks
  717Data processing: software development, installation, and management
  718Electrical computers and digital processing systems: virtual machine task or process management or task management/control
  719Electrical computers and digital processing systems: interprogram communication or interprocess communication (ipc)
  720Dynamic optical information storage or retrieval
  725Interactive video distribution systems
  726Information security
  800Multicellular living organisms and unmodified parts thereof and related processes
  850Scanning-probe techniques or apparatus; applications of scanning-probe techniques, e.g., scanning probe microscopy [spm]
  902Electronic funds transfer
  903Hybrid electric vehicles (hevs)
  930Peptide or protein sequence
  976Nuclear technology
Class Number and Title
  984Musical instruments
  987Organic compounds containing a bi, sb, as, or p atom or containing a metal atom of the 6th to 8th group of the periodic system
  D01Edible products
  D02Apparel and haberdashery
  D03Travel goods and personal belongings
  D05Textile or paper yard goods; sheet material
  D07Equipment for preparing or serving food or drink not elsewhere specified
  D08Tools and hardware
  D09Packages and containers for goods
  D10Measuring, testing, or signalling instruments
  D11Jewelry, symbolic insignia, and ornaments
  D13Equipment for production, distribution, or transformation of energy
  D14Recording, communication, or information retrieval equipment
  D15Machines not elsewhere specified
  D16Photography and optical equipment
  D17Musical instruments
  D18Printing and office machinery
  D19Office supplies; artists and teachers materials
  D20Sales and advertising equipment
  D21Games, toys, and sports goods
  D22Arms, pyrotechnics, hunting and fishing equipment
  D23Environmental heating and cooling; fluid handling and sanitary equipment
  D24Medical and laboratory equipment
  D25Building units and construction elements
Class Number and Title
  D27Tobacco and smokers' supplies
  D28Cosmetic products and toilet articles
  D29Equipment for safety, protection, and rescue
  D30Animal husbandry
  D32Washing, cleaning, or drying machine
  D34Material or article handling equipment