Clay-wares

Introduced: September 1968

Last revised: January 2006

Classification Context

Section:: CHEMISTRY; METALLURGY
Class:: CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
Subclass:: LIME; MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE

Filing statistics

IPC C04B 33/00 belongs to the parent subclass C04B, which recorded 267,018 patent applications worldwide between 2013 and 2023. Annual filings grew from 18,185 in 2013 to 23,514 in 2023 (+29%), peaking at 27,426 applications in 2018. The most active applicants in class C04 are CHINESE ACADEMY OF SCIENCES (2,095 applications), WUHAN UNIVERSITY OF TECHNOLOGY (1,205 applications) and NGK INSULATORS (1,133 applications).

Source: EPO PATSTAT, worldwide filings

Related Keywords

materials for CERAMIC(S); compositions of CERAMIC(S)CLAY(S) wareEARTHENWAREFAIENCEmanufacture of POTTERY

7 direct subcodes

Child Classifications

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C04B 33/02 Preparing or treating the raw materials individually or as batches
C04B 33/22 Grog products
C04B 33/24 Manufacture of porcelain or white ware
C04B 33/28 Slip casting
C04B 33/3 Drying methods
C04B 33/32 Burning methods
C04B 33/36 Reinforced clay-wares

Top Applicants

Top 10 applicants by patent filingsfor class C04, 2013–2023, worldwide · Source: EPO PATSTAT

CHINESE ACADEMY OF SCIENCES 2,095
WUHAN UNIVERSITY OF TECHNOLOGY 1,205
NGK INSULATORS JP 1,133
HALLIBURTON ENERGY SERVICES GROUP US 1,049
SIKA TECHNOLOGY CH 1,041
GUILIN UNIVERSITY OF TECHNOLOGY 807
WUHAN UNIVERSITY OF SCIENCE AND TECHNOLOGY 806
SOUTHEAST UNIVERSITY 801
CORNING US 777
UNITED STATES GYPSUM COMPANY US 739