Skip to content
PCE
Search Classifications
Search for IPC and CPC classification codes or keywords
CPC Subgroup Additional Only
C03B 2203/22

Radial profile of refractive index, composition or softening point

Full Title

Fibre product details, e.g. structure, shape > Internal structure or shape details > Radial profile of refractive index, composition or softening point

Filing statistics

CPC C03B 2203/22 belongs to the parent subclass C03B, which recorded 57,876 patent applications worldwide between 2013 and 2023. Annual filings grew from 4,190 in 2013 to 4,485 in 2023 (+7%), peaking at 6,433 applications in 2018. The most active applicants in class C03 are CORNING (9,559 applications), SAINT-GOBAIN GLASS (3,824 applications) and NIPPON ELECTRIC GLASS COMPANY (2,792 applications).

Source: EPO PATSTAT, worldwide filings

9 direct subcodes

Child Classifications

Navigate with arrow keys, Enter to open

  • C03B 2203/222 Mismatching viscosities or softening points of glass layers
  • C03B 2203/223 Matching viscosities or softening points of glass layers
  • C03B 2203/224 Mismatching coefficients of thermal expansion [CTE] of glass layers
  • C03B 2203/225 Matching coefficients of thermal expansion [CTE] of glass layers
  • C03B 2203/23 Double or multiple optical cladding profiles
  • C03B 2203/24 Single mode [SM or monomode]
  • C03B 2203/26 Parabolic or graded index [GRIN] core profile
  • C03B 2203/28 Large core fibres, e.g. with a core diameter greater than 60 micrometers
  • C03B 2203/29 Segmented core fibres

Top Applicants

Top 10 applicants by patent filingsfor 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