CPC Subgroup Additional Only
B01D 2325/022 Asymmetric membranes
Full Title
Details relating to properties of membranes > Details relating to pores or porosity of the membranes > Asymmetric membranes
4 direct subcodes
Child Classifications
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- B01D 2325/023 Dense layer within the membrane
- B01D 2325/0231 Dense layers being placed on the outer side of the cross-section
- B01D 2325/0232 Dense layer on both outer sides of the membrane
- B01D 2325/0233 with clearly distinguishable layers
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