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DIFF Subgroup
C03B 33/04

Cutting or splitting in curves, especially for making spectacle lenses

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Severing cooled glass > Cutting or splitting sheet glass; Apparatus or machines therefor > Cutting or splitting in curves, especially for making spectacle lenses

CPC:

Severing cooled glass (severing glass fibres C03B37/16) > Cutting or splitting sheet glass ; Apparatus or machines therefor (C03B33/09 takes precedence; glass-cutting tools C03B33/10) > Cutting or splitting in curves, especially for making spectacle lenses

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