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PCE
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DIFF Subgroup
C23C 22/48

not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates

Introduced: January 1985

Full Title

Full titles differ between systems:

IPC:

Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals > using aqueous solutions > using aqueous acidic solutions with pH < 6 > not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates

CPC:

Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals > using aqueous solutions > using aqueous acidic solutions with pH less than 6 > not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates

IPC and CPC are identically structured here. All 7 subcodes exist in both systems.

IPC defines codes here since 1985.

Child Classifications

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  • C23C 22/50 Treatment of iron or alloys based thereon since 1985 IPC+CPC Available in IPC and CPC
  • C23C 22/52 Treatment of copper or alloys based thereon since 1985 IPC+CPC Available in IPC and CPC
  • C23C 22/53 Treatment of zinc or alloys based thereon since 1985 IPC+CPC Available in IPC and CPC
  • C23C 22/54 Treatment of refractory metals or alloys based thereon since 1985 IPC+CPC Available in IPC and CPC
  • C23C 22/56 Treatment of aluminium or alloys based thereon since 1985 IPC+CPC Available in IPC and CPC
  • C23C 22/57 Treatment of magnesium or alloys based thereon since 1985 IPC+CPC Available in IPC and CPC
  • C23C 22/58 Treatment of other metallic material since 1985 IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class C23,2013–2023, worldwide · Source: EPO PATSTAT

  1. APPLIED MATERIALS US 8,096
  2. TOKYO ELECTRON JP 3,985
  3. CHINESE ACADEMY OF SCIENCES 2,842
  4. LAM RESEARCH CORPORATION US 2,654
  5. TOKYO ELECTRON 2,540
  6. NIPPON STEEL CORPORATION JP 2,465
  7. JFE STEEL JP 2,368
  8. ASM IP HOLDING NL 2,092
  9. APPLIED MATERIALS 1,877
  10. POSCO (POHANG IRON AND STEEL COMPANY) KR 1,782

Top Applicants (CPC)

Class C23,2013–2023, worldwide · Source: EPO PATSTAT

  1. APPLIED MATERIALS US 10,596
  2. TOKYO ELECTRON JP 5,229
  3. LAM RESEARCH CORPORATION US 3,622
  4. NIPPON STEEL CORPORATION JP 3,171
  5. JFE STEEL JP 3,128
  6. ASM IP HOLDING NL 2,722
  7. ARCELORMITTAL LU 2,481
  8. TOKYO ELECTRON 2,359
  9. APPLIED MATERIALS 2,284
  10. CHINESE ACADEMY OF SCIENCES 2,110