C07C 51/54 Preparation of carboxylic acid anhydrides (by oxidation C07C51/16)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Preparation of carboxylic acid anhydrides
CPC: Preparation of carboxylic acid anhydrides (by oxidation C07C51/16)
Full Title
Full titles differ between systems:
Preparation of carboxylic acids or their salts, halides, or anhydrides > Preparation of carboxylic acid anhydrides
Preparation of carboxylic acids or their salts, halides or anhydrides (of acids by hydrolysis of oils, fats or waxes C11C) > Preparation of carboxylic acid anhydrides (by oxidation C07C51/16)
IPC and CPC are identically structured here. All 3 subcodes exist in both systems.
2 shared codes have differing titles between IPC and CPC.
Child Classifications
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- C07C 51/567 by reactions not involving carboxylic acid anhydride groups since 1980 IPC+CPC Available in IPC and CPC
- C07C 51/573 Separation; Purification; Stabilisation; Use of additives since 1980 IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
Class C07,2013–2023, worldwide · Source: EPO PATSTAT
- CHINESE ACADEMY OF SCIENCES 12,697
- ROCHE CH 11,347
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 11,024
- NOVARTIS CH 9,356
- BASF (BADISCHE ANILIN & SODA FABRIK) DE 8,531
- BRISTOL-MYERS SQUIBB COMPANY US 7,320
- LG CHEM KR 7,245
- REGENERON PHARMACEUTICALS US 6,816
- HARVARD UNIVERSITY US 6,190
- GENENTECH US 5,922
Top Applicants (CPC)
Class C07,2013–2023, worldwide · Source: EPO PATSTAT
- ROCHE CH 12,683
- NOVARTIS CH 10,775
- CHINESE ACADEMY OF SCIENCES 10,619
- BASF (BADISCHE ANILIN & SODA FABRIK) DE 9,511
- REGENERON PHARMACEUTICALS US 8,426
- BRISTOL-MYERS SQUIBB COMPANY US 7,979
- LG CHEM KR 7,978
- HARVARD UNIVERSITY US 7,706
- UNIVERSITY OF CALIFORNIA US 7,455
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 7,219