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DIFF Main Group
C03C 4/00

Compositions for glass with special properties

Introduced: January 1985

CPC subdivides this area 2x more granularly than IPC with 11 additional codes.

11 codes are CPC-only extensions.

IPC defines codes here since 1985.

Child Classifications

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  • C03C 4/0028 CPC only CPC only
  • C03C 4/0035 CPC only CPC only
  • C03C 4/0042 CPC only CPC only
  • C03C 4/005 CPC only CPC only
  • C03C 4/0057 CPC only CPC only
  • C03C 4/0064 CPC only CPC only
  • C03C 4/0071 CPC only CPC only
  • C03C 4/0078 CPC only CPC only
  • C03C 4/0085 CPC only CPC only
  • C03C 4/0092 CPC only CPC only
  • C03C 4/02 for coloured glass since 1985 IPC+CPC Available in IPC and CPC
  • C03C 4/10 for infrared transmitting glass since 1985 IPC+CPC Available in IPC and CPC
  • C03C 4/12 for luminescent glass; for fluorescent glass since 1985 IPC+CPC Available in IPC and CPC
  • C03C 4/14 for electro-conductive glass since 1985 IPC+CPC Available in IPC and CPC
  • C03C 4/16 for dielectric glass since 1985 IPC+CPC Available in IPC and CPC
  • C03C 4/18 for ion-sensitive glass since 1985 IPC+CPC Available in IPC and CPC
  • C03C 4/20 for chemical resistant glass since 1985 IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class C03,2013–2023, worldwide · Source: EPO PATSTAT

  1. CORNING US 8,800
  2. SAINT-GOBAIN GLASS FR 3,535
  3. NIPPON ELECTRIC GLASS COMPANY JP 2,675
  4. NIPPON ELECTRIC GLASS COMPANY 2,616
  5. AGC JP 1,911
  6. SCHOTT DE 1,846
  7. ASAHI GLASS COMPANY JP 1,632
  8. CORNING 1,556
  9. A G C 1,250
  10. SEKISUI CHEMICAL COMPANY JP 1,087

Top Applicants (CPC)

Class C03,2013–2023, worldwide · Source: EPO PATSTAT

  1. CORNING US 9,559
  2. SAINT-GOBAIN GLASS FR 3,824
  3. NIPPON ELECTRIC GLASS COMPANY JP 2,792
  4. SCHOTT DE 2,029
  5. AGC JP 1,938
  6. ASAHI GLASS COMPANY JP 1,679
  7. CORNING 1,650
  8. NIPPON ELECTRIC GLASS COMPANY 1,501
  9. A G C 1,049
  10. O-I (OWENS-ILLINOIS) US 1,027