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PCE
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DIFF Subgroup
C21D 3/02

Extraction of non-metals

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Diffusion processes for extraction of non-metals; Furnaces therefor > Extraction of non-metals

CPC:

Diffusion processes for extraction of non-metals; Furnaces therefor (local protective coatings C21D1/72) > Extraction of non-metals

IPC and CPC are identically structured here. All 3 subcodes exist in both systems.

Child Classifications

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  • C21D 3/04 Decarburising IPC+CPC Available in IPC and CPC
  • C21D 3/06 Extraction of hydrogen IPC+CPC Available in IPC and CPC
  • C21D 3/08 Extraction of nitrogen IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class C21,2013–2023, worldwide · Source: EPO PATSTAT

  1. JFE STEEL JP 7,470
  2. POSCO (POHANG IRON AND STEEL COMPANY) KR 4,615
  3. JFE STEEL 4,538
  4. NIPPON STEEL CORPORATION JP 4,536
  5. ARCELORMITTAL LU 2,597
  6. NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 2,241
  7. ANGANG STEEL COMPANY 2,126
  8. NSSMC (NIPPON STEEL & SUMITOMO METAL) 1,783
  9. BAOSHAN IRON & STEEL COMPANY 1,620
  10. HYUNDAI STEEL COMPANY KR 1,545

Top Applicants (CPC)

Class C21,2013–2023, worldwide · Source: EPO PATSTAT

  1. JFE STEEL JP 8,270
  2. NIPPON STEEL CORPORATION JP 5,222
  3. POSCO (POHANG IRON AND STEEL COMPANY) KR 4,824
  4. JFE STEEL 3,311
  5. ARCELORMITTAL LU 3,239
  6. NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 2,659
  7. HYUNDAI STEEL COMPANY KR 1,492
  8. ANGANG STEEL COMPANY 1,318
  9. BAOSHAN IRON & STEEL COMPANY 1,233
  10. KOBE STEEL JP 1,228