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DIFF Subgroup
B24B 19/11

for grinding the circumferential surface of rings, e.g. piston rings (grinding end faces B24B7/16, B24B7/17)

Introduced: September 1968

Title

Titles differ between systems:

IPC: for grinding the circumferential surface of rings, e.g. piston rings

CPC: for grinding the circumferential surface of rings, e.g. piston rings (grinding end faces B24B7/16, B24B7/17)

Full Title

Full titles differ between systems:

IPC:

Single purpose machines or devices for particular grinding operations not covered by any other main group > for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section > for grinding the circumferential surface of rings, e.g. piston rings

CPC:

Single-purpose machines or devices for particular grinding operations not covered by any other main group (tapering, chamfering, or relief cutting of taps or reamers B24B3/20, B24B3/22, grinding screw threads B23G) > for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section > for grinding the circumferential surface of rings, e.g. piston rings (grinding end faces B24B7/16, B24B7/17)

No child classifications to compare. This is a leaf node in both IPC and CPC.

Top Applicants

Top Applicants (IPC)

Class B24,2013–2023, worldwide · Source: EPO PATSTAT

  1. DISCO ABRASIVE SYSTEM 3,084
  2. APPLIED MATERIALS US 1,570
  3. EBARA CORPORATION JP 1,393
  4. DISCO CORPORATION JP 1,368
  5. 3M INNOVATIVE PROPERTIES COMPANY (MINNESOTA MINING AND MANUFACTURING INNOVATIVE PROPERTIES COMPANY) US 1,270
  6. EBARA CORPORATION 1,016
  7. FUJIMI JP 829
  8. ZHEJIANG UNIVERSITY OF TECHNOLOGY 804
  9. ROBERT BOSCH DE 803
  10. SAINT-GOBAIN ABRASIVES US 781

Top Applicants (CPC)

Class B24,2013–2023, worldwide · Source: EPO PATSTAT

  1. DISCO CORPORATION JP 2,092
  2. APPLIED MATERIALS US 1,813
  3. EBARA CORPORATION JP 1,804
  4. 3M INNOVATIVE PROPERTIES COMPANY (MINNESOTA MINING AND MANUFACTURING INNOVATIVE PROPERTIES COMPANY) US 1,329
  5. ROBERT BOSCH DE 863
  6. FUJIMI JP 858
  7. SAINT-GOBAIN ABRASIVES US 833
  8. EBARA CORPORATION 810
  9. SAINT-GOBAIN ABRASIVES FR 782
  10. DISCO ABRASIVE SYSTEM 735