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DIFF Subgroup
B01D 39/18

the material being cellulose or derivatives thereof ( ; making filter paper D21F11/14)

Introduced: September 1968

Title

Titles differ between systems:

IPC: the material being cellulose or derivatives thereof

CPC: the material being cellulose or derivatives thereof ( ; making filter paper D21F11/14)

Full Title

Full titles differ between systems:

IPC:

Filtering material for liquid or gaseous fluids > Other self-supporting filtering material > of organic material, e.g. synthetic fibres > the material being cellulose or derivatives thereof

CPC:

Filtering material for liquid or gaseous fluids > Other self-supporting filtering material > of organic material, e.g. synthetic fibres > the material being cellulose or derivatives thereof ( ; making filter paper D21F11/14)

No child classifications to compare. This is a leaf node in both IPC and CPC.

Top Applicants

Top Applicants (IPC)

Class B01,2013–2023, worldwide · Source: EPO PATSTAT

  1. SINOPEC (CHINA PETROCHEMICAL CORPORATION) 16,893
  2. CHINESE ACADEMY OF SCIENCES 11,733
  3. BASF (BADISCHE ANILIN & SODA FABRIK) DE 3,898
  4. LG CHEM KR 3,367
  5. PETROCHINA COMPANY 3,224
  6. IFPEN (IFP ENERGIES NOUVELLES) FR 3,042
  7. ZHEJIANG UNIVERSITY 2,890
  8. MANN + HUMMEL DE 2,740
  9. JOHNSON MATTHEY GB 2,534
  10. SAUDI ARABIAN OIL COMPANY SA 2,527

Top Applicants (CPC)

Class B01,2013–2023, worldwide · Source: EPO PATSTAT

  1. SINOPEC (CHINA PETROCHEMICAL CORPORATION) 10,345
  2. CHINESE ACADEMY OF SCIENCES 8,352
  3. BASF (BADISCHE ANILIN & SODA FABRIK) DE 5,134
  4. LG CHEM KR 4,290
  5. SAUDI ARABIAN OIL COMPANY SA 3,444
  6. IFPEN (IFP ENERGIES NOUVELLES) FR 3,417
  7. DOW GLOBAL TECHNOLOGIES US 3,195
  8. MANN + HUMMEL DE 2,822
  9. JOHNSON MATTHEY GB 2,802
  10. UNIVERSAL OIL PRODUCTS COMPANY (UOP) US 2,737