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CPC Subgroup Additional Only
B01J 2540/52

Phosphorus acid or phosphorus acid ester groups

Full Title

Compositional aspects of coordination complexes or ligands in catalyst systems > Non-coordinating groups comprising phosphorus > Phosphorus acid or phosphorus acid ester groups

3 direct subcodes

Child Classifications

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  • B01J 2540/522 being phosphoric acid mono-, di- or triester groups ((RO)(R'O)2P=O), i.e. R= C, R'= C, H
  • B01J 2540/525 being phosphorous acid (-ester) groups ((RO)P(OR')2) or the isomeric phosphonic acid (-ester) groups (R(R'O)2P=O), i.e. R= C, R'= C, H
  • B01J 2540/527 being phosphonous acid (-ester) groups (RP(OR')2) or the isomeric phosphinic acid (-ester) groups (R2(R'O)P=O), i.e. R= C, R'= C, H

Top Applicants

Top 10 applicants by patent filingsfor 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