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chemistry (2553) 2553
fuels (2539) 2539
cracking hydrocarbon oils (2537) 2537
lubricants (2537) 2537
metallurgy (2537) 2537
mineral waxes (2537) 2537
peat (2537) 2537
petroleum, gas or coke industries (2537) 2537
production of liquid hydrocarbon mixtures, e.g. by destructivehydrogenation, oligomerisation, polymerisation (2537) 2537
recovery of hydrocarbon oils from oil-shale, oil-sand, orgases (2537) 2537
refining mixtures mainly consisting of hydrocarbons (2537) 2537
reforming of naphtha (2537) 2537
technical gases containing carbon monoxide (2537) 2537
inorganic chemistry (1871) 1871
compounds thereof (1865) 1865
non-metallic elements (1864) 1864
performing operations (1353) 1353
transporting (1353) 1353
physical or chemical processes or apparatus in general (1277) 1277
chemical or physical processes, e.g. catalysis or colloidchemistry (1115) 1115
their relevant apparatus (1115) 1115
general tagging of cross-sectional technologies spanning over several sections of the ipc (867) 867
general tagging of new technological developments (867) 867
technical subjects covered by former uspc cross-reference art collections [xracs] and digests (867) 867
technologies or applications for mitigation or adaptation againstclimate change (844) 844
climate change mitigation technologies in the production orprocessing of goods (747) 747
organic chemistry (654) 654
acyclic or carbocyclic compounds (626) 626
compositions based thereon (324) 324
organic macromolecular compounds (324) 324
their preparation or chemical working-up (324) 324
natural gas (280) 280
adding materials to fuels or fires to reduce smoke orundesirable deposits or to facilitate soot removal (273) 273
firelighters (273) 273
fuels not otherwise provided for (273) 273
liquefied petroleum gas (273) 273
synthetic natural gas obtained by processes not covered bysubclasses c10g, c10k (273) 273
separation (269) 269
purifying or modifying the chemical composition of combustiblegases containing carbon monoxide (263) 263
carburetting air or other gases (256) 256
production of producer gas, water-gas, synthesis gas fromsolid carbonaceous material, or mixtures containing these gases (256) 256
use of inorganic or non-macromolecular organic substances ascompounding ingredients (244) 244
reduction of greenhouse gas [ghg] emissions, related to energygeneration, transmission or distribution (237) 237
apparatus therefor (212) 212
destructive distillation of carbonageous materials forproduction of gas, coke, tar, or similar materials (206) 206
blasting (188) 188
heating (188) 188
lighting (188) 188
mechanical engineering (188) 188
weapons (188) 188
compositions of macromolecular compounds (186) 186
ferrous or non-ferrous alloys (117) 117
treatment of alloys or non-ferrous metals (117) 117
electricity (116) 116
chemical surface treatment (109) 109
coating by vacuum evaporation, by sputtering, by ion implantationor by chemical vapour deposition, in general (109) 109
coating material with metallic material (109) 109
coating metallic material (109) 109
diffusion treatment of metallic material (109) 109
inhibiting corrosion of metallic material or incrustation ingeneral (109) 109
basic electric elements (107) 107
electrolytic or electrophoretic processes (101) 101
electrolytic or electrophoretic processes for the productionof compounds or non-metals (96) 96
adhesives (89) 89
dyes (89) 89
miscellaneous applications of materials (89) 89
miscellaneous compositions (89) 89
natural resins (89) 89
paints (89) 89
polishes (89) 89
processes or means, e.g. batteries, for the direct conversionof chemical into electrical energy (89) 89
multi-step processes for surface treatment of metallicmaterial involving at least one process provided for in classc23 and at least oneprocess covered by subclass c21d or c22f or class c25 (85) 85
non-mechanical removal of metallic material from surface (85) 85
textiles (79) 79
treatment of water, waste water, sewage, or sludge (72) 72
engine plants in general (67) 67
indexing scheme relating to structural and physical aspects ofsolid inorganic compounds (67) 67
machines or engines in general (67) 67
steam engines (67) 67
paper-making (62) 62
production of cellulose (62) 62
physics (61) 61
pretreatment of raw materials (61) 61
production and refining of metals (61) 61
production of cellulose by removing non-cellulose substancesfrom cellulose-containing materials (60) 60
regeneration of pulping liquors (60) 60
after-treatment not covered by subclasses c08b, c08c, c08f,c08g (56) 56
general processes of compounding (56) 56
working-up (56) 56
alloys (55) 55
disposal of solid waste (52) 52
lubricating compositions (52) 52
reclamation of contamined soil soil (52) 52
use of chemical substances either alone or as lubricatingingredients in a lubricating composition (52) 52
general methods of organic chemistry (49) 49
climate change mitigation technologies related to wastewatertreatment or waste management (46) 46
combustion engines (45) 45
hot-gas or combustion-product engine plants (45) 45
technical subjects covered by former uspc (44) 44
pyroligneous acid (43) 43
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