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International Patent Classification (IPC)
Section A — human necessities
Agriculture: Agriculture; forestry; animal...  
Foodstuffs; tobacco: Baking; equipment for making...   Butchering; meat treatment;...   Foods or foodstuffs; their...   Tobacco; cigars; cigarettes;...  
Personal or domestic articles: Wearing apparel   Headwear   Footwear   Haberdashery; jewellery   Hand or travelling articles   Brushware   Furniture; domestic articles...   [+3] [-3]
Health; life-saving; amusement: Medical or veterinary science;...   Life-saving; fire-fighting   Sports; games; amusements   Subject matter not otherwise...  
Section B — performing operations; transporting
Separating; mixing: Physical or chemical processes...   Crushing, pulverising, or...   Separation of solid materials...   Centrifugal apparatus or...   Spraying or atomising in...   Generating or transmitting...   Separating solids from solids;...   Cleaning   Disposal of solid waste;...   [+5] [-5]
Shaping: Mechanical metal-working...   Casting; powder metallurgy   Machine tools; metal-working...   Grinding; polishing   Hand tools; portable...   Hand cutting tools; cutting;...   Working or preserving wood or...   Working cement, clay, or stone   Working of plastics; working...   Presses   Making paper articles; working...   Layered products   [+8] [-8]
Printing: Printing; lining machines;...   Bookbinding; albums; files;...   Writing or drawing implements;...   Decorative arts  
Transporting: Vehicles in general   Railways   Land vehicles for travelling...   Ships or other waterborne...   Aircraft; aviation; cosmonauti...   Conveying; packing; storing;...   Hoisting; lifting; hauling   Opening or closing bottles,...   Saddlery; upholstery   [+5] [-5]
Micro-structural technology; nano-technology: Micro-structural technology   Nano-technology   Subject matter not otherwise...  
Section C — chemistry; metallurgy [+] [-]
Chemistry: Inorganic chemistry   Treatment of water, waste...   Glass; mineral or slag wool   Cements; concrete; artificial...   Fertilisers; manufacture...   Explosives; matches   Organic chemistry   Organic macromolecular...   Dyes; paints; polishes;...   Petroleum, gas or coke...   Animal or vegetable oils,...   Biochemistry; beer; spirits;...   Sugar industry   Skins; hides; pelts; leather   [+10] [-10]
Metallurgy: Metallurgy of iron   Metallurgy; ferrous or...   Coating metallic material;...   Electrolytic or electrophoreti...   Crystal growth   [+1] [-1]
Combinatorial technology: Combinatorial technology   Subject matter not otherwise...  
Section D — textiles; paper [+] [-]
Textiles or flexible materials not otherwise provided for: Natural or artificial threads...   Yarns; mechanical finishing of...   Weaving   Braiding; lace-making;...   Sewing; embroidering; tufting   Treatment of textiles or the...   Ropes; cables other than...   [+3] [-3]
Paper: Paper-making; production of...   Subject matter not otherwise...  
Section E — fixed constructions [+] [-]
Building: Construction of roads,...   Hydraulic engineering;...   Water supply; sewerage   Building   Locks; keys; window or door...   Doors, windows, shutters, or...   [+2] [-2]
Earth or rock drilling; mining: Earth or rock drilling; mining   Subject matter not otherwise...  
Section F — mechanical engineering; lighting; heating; weapons; blasting [+] [-]
Engines or pumps: Machines or engines in...   Combustion engines; hot-gas or...   Machines or engines for...   Positive-displacement machines...  
Engineering in general: Fluid-pressure actuators;...   Engineering elements or units;...   Storing or distributing gases...  
Lighting; heating: Lighting   Steam generation   Combustion apparatus;...   Heating; ranges; ventilating   Refrigeration or cooling;...   Drying   Furnaces; kilns; ovens;...   Heat exchange in general   [+4] [-4]
Weapons; blasting: Weapons   Ammunition; blasting   Subject matter not otherwise...  
Section G — physics [+] [-]
Instruments: Measuring; testing   Optics   Photography; cinematography;...   Horology   Controlling; regulating   Computing; calculating;...   Checking-devices   Signalling   Educating; cryptography;...   Musical instruments; acoustics   Information storage   Instrument details   [+8] [-8]
Nucleonics: Nuclear physics; nuclear...   Subject matter not otherwise...  
Section H — electricity [+] [-]
Basic electric elements   Generation, conversion, or...   Basic electronic circuitry   Electric communication...   Electric techniques not...   Subject matter not otherwise...   [+2] [-2]