CPC Subgroup
C07C 41/34 Separation; Purification; Stabilisation; Use of additives
Full Title
Preparation of ethers; Preparation of compounds having [IMAGE cpc-sch-C07C-0958.gif] groups,[IMAGE cpc-sch-C07C-0959.gif] groups or[IMAGE cpc-sch-C07C-0960.gif] groups > Preparation of ethers > Separation; Purification; Stabilisation; Use of additives
5 direct subcodes
Child Classifications
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- C07C 41/36 by solid-liquid treatment; by chemisorption
- C07C 41/38 by liquid-liquid treatment
- C07C 41/40 by change of physical state, e.g. by crystallisation
- C07C 41/44 by treatments giving rise to a chemical modification (by chemisorption C07C41/36)
- C07C 41/46 Use of additives, e.g. for stabilisation
Top Applicants
Top 10 applicants by patent filingsfor 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