CPC Subgroup Additional Only
C03B 2205/60 Optical fibre draw furnaces
Full Title
Fibre drawing or extruding details > Optical fibre draw furnaces
Filing statistics
CPC C03B 2205/60 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
8 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- C03B 2205/61 Recovering, recycling or purifying the inert gas, e.g. helium
- C03B 2205/62 Heating means for drawing
- C03B 2205/70 Draw furnace insulation
- C03B 2205/72 Controlling or measuring the draw furnace temperature
- C03B 2205/74 Means for moving at least a part of the draw furnace, e.g. by rotation or vertical or horizontal movement
- C03B 2205/80 Means for sealing the preform entry or upper end of the furnace
- C03B 2205/82 Means for sealing the fibre exit or lower end of the furnace
- C03B 2205/90 Manipulating the gas flow through the furnace other than by use of upper or lower seals, e.g. by modification of the core tube shape or by using baffles
Top Applicants
Top 10 applicants by patent filingsfor class C03, 2013–2023, worldwide · Source: EPO PATSTAT
- CORNING US 9,559
- SAINT-GOBAIN GLASS FR 3,824
- NIPPON ELECTRIC GLASS COMPANY JP 2,792
- SCHOTT DE 2,029
- AGC JP 1,938
- ASAHI GLASS COMPANY JP 1,679
- CORNING 1,650
- NIPPON ELECTRIC GLASS COMPANY 1,501
- A G C 1,049
- O-I (OWENS-ILLINOIS) US 1,027