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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

9 direct subcodes

Child Classifications

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  • 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