IPC Subgroup
C07C 303/04 by substitution of hydrogen atoms by sulfo or halosulfonyl groups
Introduced: January 1990
Last revised: January 2006
Full Title
Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides > of sulfonic acids or halides thereof > by substitution of hydrogen atoms by sulfo or halosulfonyl groups
Classification Context
- Section:
- CHEMISTRY; METALLURGY
- Class:
- ORGANIC CHEMISTRY
- Subclass:
- ACYCLIC OR CARBOCYCLIC COMPOUNDS
4 direct subcodes
Child Classifications
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- C07C 303/06 by reaction with sulfuric acid or sulfur trioxide
- C07C 303/08 by reaction with halogenosulfonic acids
- C07C 303/1 by reaction with sulfur dioxide and halogen or by reaction with sulfuryl halides
- C07C 303/12 by reaction with thionylhalides
Top Applicants
Top 10 applicants by patent filingsfor 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