CPC Subgroup Additional Only
B01D 2252/20436 Cyclic amines
Full Title
Absorbents, i.e. solvents and liquid materials for gas absorption > Organic absorbents > Amines > Cyclic amines
7 direct subcodes
Child Classifications
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- B01D 2252/20442 containing a piperidine-ring
- B01D 2252/20447 containing a piperazine-ring
- B01D 2252/20452 containing a morpholine-ring
- B01D 2252/20457 containing a pyridine-ring
- B01D 2252/20463 containing a pyrimidine-ring
- B01D 2252/20468 containing a pyrrolidone-ring
- B01D 2252/20473 containing an imidazole-ring
Top Applicants
Top 10 applicants by patent filingsfor class B01, 2013–2023, worldwide · Source: EPO PATSTAT
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 10,345
- CHINESE ACADEMY OF SCIENCES 8,352
- BASF (BADISCHE ANILIN & SODA FABRIK) DE 5,134
- LG CHEM KR 4,290
- SAUDI ARABIAN OIL COMPANY SA 3,444
- IFPEN (IFP ENERGIES NOUVELLES) FR 3,417
- DOW GLOBAL TECHNOLOGIES US 3,195
- MANN + HUMMEL DE 2,822
- JOHNSON MATTHEY GB 2,802
- UNIVERSAL OIL PRODUCTS COMPANY (UOP) US 2,737