Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins

Introduced: September 1968

Last revised: January 2006

Classification Context

Section:: CHEMISTRY; METALLURGY
Class:: GLASS; MINERAL OR SLAG WOOL
Subclass:: MANUFACTURE OR SHAPING OF GLASS, OR OF MINERAL OR SLAG WOOL; SUPPLEMENTARY PROCESSES IN THE MANUFACTURE OR SHAPING OF GLASS, OR OF MINERAL OR SLAG WOOL

Filing statistics

IPC C03B 29/00 belongs to the parent subclass C03B, which recorded 88,293 patent applications worldwide between 2013 and 2023. Annual filings grew from 6,347 in 2013 to 8,869 in 2023 (+40%), peaking at 9,707 applications in 2020. 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

Related Keywords

fire- POLISHING of glass

2 direct subcodes

Child Classifications

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C03B 29/02 in a discontinuous way
C03B 29/04 in a continuous way

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