Surface treatment of fibres or filaments made from glass, minerals or slags

Filing statistics

CPC C03C 25/00 belongs to the parent subclass C03C, which recorded 95,236 patent applications worldwide between 2013 and 2023. Annual filings grew from 6,471 in 2013 to 7,112 in 2023 (+10%), peaking at 10,632 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

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C03C 25/002 Thermal treatment
C03C 25/005 by mechanical means
C03C 25/007 Impregnation by solution; Solution doping or molecular stuffing of porous glass
C03C 25/10 Coating
C03C 25/60 by diffusing ions or metals into the surface
C03C 25/62 by application of electric or wave energy (for drying or dehydration C03C25/64); by particle radiation or ion implantation
C03C 25/64 Drying; Dehydration; Dehydroxylation
C03C 25/66 Chemical treatment, e.g. leaching, acid or alkali treatment (dehydroxylation C03C25/64)
C03C 25/70 Cleaning, e.g. for reuse (C03C25/62 -C03C25/66 take precedence)

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