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DIFF Subgroup
B21D 51/44

Making closures, e.g. caps (folded of thin metal foils in the way of making paper caps B31D5/00; making closures in conjunction with applying same B67B)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Making closures, e.g. caps

CPC: Making closures, e.g. caps (folded of thin metal foils in the way of making paper caps B31D5/00; making closures in conjunction with applying same B67B)

Full Title

Full titles differ between systems:

IPC:

Making hollow objects > characterised by the use of the objects > Making inlet or outlet arrangements of cans, tins, baths, bottles or other vessels; Making can ends; Making closures > Making closures, e.g. caps

CPC:

Making hollow objects (from thick-walled or non uniform tubes B21K21/00) > characterised by the use of the objects (making heat exchangers B21D53/02) > Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures > Making closures, e.g. caps (folded of thin metal foils in the way of making paper caps B31D5/00; making closures in conjunction with applying same B67B)

Of 5 combined children, 3 exist in both systems.

2 codes are CPC-only extensions.

Child Classifications

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  • B21D 51/443 CPC only CPC only
  • B21D 51/446 CPC only CPC only
  • B21D 51/46 Placing sealings or sealing material IPC+CPC Available in IPC and CPC
  • B21D 51/48 Making crown caps IPC+CPC Available in IPC and CPC
  • B21D 51/50 Making screw caps IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class B21,2013–2023, worldwide · Source: EPO PATSTAT

  1. JFE STEEL 2,318
  2. JFE STEEL JP 2,294
  3. POSCO (POHANG IRON AND STEEL COMPANY) KR 2,083
  4. NIPPON STEEL CORPORATION JP 1,650
  5. NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 1,631
  6. SMS GROUP DE 1,472
  7. BAOSHAN IRON & STEEL COMPANY 1,181
  8. SGCC(STATE GRID CORPORATION OF CHINA) 1,079
  9. ANHUI JIANGHUAI AUTOMOBILE 984
  10. HYUNDAI STEEL COMPANY KR 980

Top Applicants (CPC)

Class B21,2013–2023, worldwide · Source: EPO PATSTAT

  1. JFE STEEL JP 2,667
  2. NIPPON STEEL CORPORATION JP 2,049
  3. POSCO (POHANG IRON AND STEEL COMPANY) KR 1,967
  4. NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 1,800
  5. SMS GROUP DE 1,538
  6. JFE STEEL 1,150
  7. ARCELORMITTAL LU 1,142
  8. BAOSHAN IRON & STEEL COMPANY 821
  9. HYUNDAI STEEL COMPANY KR 808
  10. THYSSENKRUPP STEEL EUROPE DE 660