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DIFF Subgroup
C03B 23/04

Re-forming tubes or rods

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Re-forming shaped glass > Re-forming tubes or rods

CPC:

Re-forming shaped glass (re-forming fibres or filaments C03B37/14) > Re-forming tubes or rods

IPC and CPC are identically structured here. All 14 subcodes exist in both systems.

6 shared codes have differing titles between IPC and CPC.

Child Classifications

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  • C03B 23/043 Heating devices specially adapted for re-forming tubes or rods in general, e.g. burners since 1990 IPC+CPC Available in IPC and CPC
  • C03B 23/045 Tools or apparatus specially adapted for re-forming tubes or rods in general, e.g. glass lathes, chucks (C03B23/043 takes precedence) since 1990 IPC+CPC Available in IPC and CPC
  • C03B 23/051 by gravity, e.g. sagging since 1990 IPC+CPC Available in IPC and CPC
  • C03B 23/053 by centrifuging ( , C03B37/04 takes precedence) since 1990 IPC+CPC Available in IPC and CPC
  • C03B 23/055 by rolling since 1990 IPC+CPC Available in IPC and CPC
  • C03B 23/057 by fusing, e.g. for flame sealing (C03B9/42, C03B21/06 , C03B33/08 take precedence) since 1990 IPC+CPC Available in IPC and CPC
  • C03B 23/08 to exact dimensions, e.g. calibrating IPC+CPC Available in IPC and CPC
  • C03B 23/13 Reshaping combined with uniting or heat sealing, e.g. for making vacuum bottles since 1980 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