CPC Subgroup Additional Only
B01D 2239/065 More than one layer present in the filtering material
Full Title
Aspects relating to filtering material for liquid or gaseous fluids > Filter cloth, e.g. knitted, woven non-woven; self-supported material > More than one layer present in the filtering material
8 direct subcodes
Child Classifications
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- B01D 2239/0654 Support layers
- B01D 2239/0659 The layers being joined by needling
- B01D 2239/0663 The layers being joined by hydro-entangling
- B01D 2239/0668 The layers being joined by heat or melt-bonding
- B01D 2239/0672 The layers being joined by welding
- B01D 2239/0677 by spot-welding
- B01D 2239/0681 The layers being joined by gluing
- B01D 2239/0686 by spot-gluing
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