based on non-oxides

Introduced: January 1995

Last revised: January 2006

Full Title

Shaped ceramic products characterised by their composition; Ceramic compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products > based on non-oxides

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

5 direct subcodes

Child Classifications

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C04B 35/52 based on carbon, e.g. graphite
C04B 35/547 based on sulfides or selenides
C04B 35/553 based on fluorides
C04B 35/56 based on carbides
C04B 35/58 based on borides, nitrides or silicides

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