CPC Subgroup
B01D 71/06 Organic material
Full Title
Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor > Organic material
20 direct subcodes
Child Classifications
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- B01D 71/08 Polysaccharides
- B01D 71/24 Rubbers
- B01D 71/26 Polyalkenes
- B01D 71/28 Polymers of vinyl aromatic compounds
- B01D 71/30 Polyalkenyl halides
- B01D 71/38 Polyalkenylalcohols; Polyalkenylesters; Polyalkenylethers; Polyalkenylaldehydes; Polyalkenylketones; Polyalkenylacetals; Polyalkenylketals
- B01D 71/40 Polymers of unsaturated acids or derivatives thereof, e.g. salts, amides, imides, nitriles, anhydrides, esters
- B01D 71/44 Polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of groups B01D71/26-B01D71/42
- B01D 71/46 Epoxy resins
- B01D 71/48 Polyesters
- B01D 71/50 Polycarbonates
- B01D 71/52 Polyethers
- B01D 71/54 Polyureas; Polyurethanes
- B01D 71/56 Polyamides, e.g. polyester-amides
- B01D 71/58 Other polymers having nitrogen in the main chain, with or without oxygen or carbon only
- B01D 71/66 Polymers having sulfur in the main chain, with or without nitrogen, oxygen or carbon only
- B01D 71/70 Polymers having silicon in the main chain, with or without sulfur, nitrogen, oxygen or carbon only
- B01D 71/72 Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of the groups B01D71/46 - B01D71/70
- B01D 71/74 Natural macromolecular material or derivatives thereof (B01D71/08, B01D71/24 take precedence)
- B01D 71/76 Macromolecular material not specifically provided for in a single one of groups B01D71/08 - B01D71/74 (rubbers in general B01D71/24)
Top Applicants
Top 10 applicants by patent filingsfor class B01, 2013–2023, worldwide · Source: EPO PATSTAT
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 10,345
- CHINESE ACADEMY OF SCIENCES 8,352
- BASF (BADISCHE ANILIN & SODA FABRIK) DE 5,134
- LG CHEM KR 4,290
- SAUDI ARABIAN OIL COMPANY SA 3,444
- IFPEN (IFP ENERGIES NOUVELLES) FR 3,417
- DOW GLOBAL TECHNOLOGIES US 3,195
- MANN + HUMMEL DE 2,822
- JOHNSON MATTHEY GB 2,802
- UNIVERSAL OIL PRODUCTS COMPANY (UOP) US 2,737