CPC Main Group
B24B 21/00 Machines or devices using grinding or polishing belts (for sharpening cutting edges of tools B24B3/00; portable belt-grinding machines B24B23/06); Accessories therefor
Filing statistics
CPC B24B 21/00 belongs to the parent subclass B24B, which recorded 132,872 patent applications worldwide between 2013 and 2023. Annual filings grew from 5,708 in 2013 to 13,782 in 2023 (+141%), peaking at 18,119 applications in 2020. The most active applicants in class B24 are DISCO CORPORATION (2,092 applications), APPLIED MATERIALS (1,813 applications) and EBARA CORPORATION (1,804 applications).
Source: EPO PATSTAT, worldwide filings
8 direct subcodes
Child Classifications
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- B24B 21/02 for grinding rotationally symmetrical surfaces
- B24B 21/04 for grinding plane surfaces
- B24B 21/16 for grinding other surfaces of particular shape (single purpose machines for grinding cams or camshafts B24B19/12)
- B24B 21/18 Accessories
Top Applicants
Top 10 applicants by patent filingsfor class B24, 2013–2023, worldwide · Source: EPO PATSTAT
- DISCO CORPORATION JP 2,092
- APPLIED MATERIALS US 1,813
- EBARA CORPORATION JP 1,804
- 3M INNOVATIVE PROPERTIES COMPANY (MINNESOTA MINING AND MANUFACTURING INNOVATIVE PROPERTIES COMPANY) US 1,329
- ROBERT BOSCH DE 863
- FUJIMI JP 858
- SAINT-GOBAIN ABRASIVES US 833
- EBARA CORPORATION 810
- SAINT-GOBAIN ABRASIVES FR 782
- DISCO ABRASIVE SYSTEM 735