with 40% to 90% silica by weight

Introduced: January 1985

Last revised: January 2006

Full Title

Glass compositions > containing silica > with 40% to 90% silica by weight

Classification Context

Section:: CHEMISTRY; METALLURGY
Class:: GLASS; MINERAL OR SLAG WOOL
Subclass:: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS

Filing statistics

IPC C03C 3/076 belongs to the parent subclass C03C, which recorded 106,119 patent applications worldwide between 2013 and 2023. Annual filings grew from 8,013 in 2013 to 8,692 in 2023 (+8%), peaking at 11,106 applications in 2018. The most active applicants in class C03 are CORNING (8,800 applications), SAINT-GOBAIN GLASS (3,535 applications) and NIPPON ELECTRIC GLASS COMPANY (2,675 applications).

Source: EPO PATSTAT, worldwide filings

7 direct subcodes

Child Classifications

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C03C 3/078 containing an oxide of a divalent metal, e.g. an oxide of zinc
C03C 3/083 containing aluminium oxide or an iron compound
C03C 3/089 containing boron
C03C 3/095 containing rare earths
C03C 3/097 containing phosphorus, niobium or tantalum
C03C 3/102 containing lead
C03C 3/11 containing halogen or nitrogen

Top Applicants

Top 10 applicants by patent filingsfor class C03, 2013–2023, worldwide · Source: EPO PATSTAT

CORNING US 8,800
SAINT-GOBAIN GLASS FR 3,535
NIPPON ELECTRIC GLASS COMPANY JP 2,675
NIPPON ELECTRIC GLASS COMPANY 2,616
AGC JP 1,911
SCHOTT DE 1,846
ASAHI GLASS COMPANY JP 1,632
CORNING 1,556
A G C 1,250
SEKISUI CHEMICAL COMPANY JP 1,087