IPC Subgroup
C04B 33/132 Waste materials; Refuse
Introduced: January 2006
Full Title
Clay-wares > Preparing or treating the raw materials individually or as batches > Compounding ingredients > Waste materials; Refuse
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
Related Keywords
converting REFUSE into clay-waresclay-wares, having WASTE materials as compounding ingredients
2 direct subcodes
Child Classifications
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- C04B 33/135 Combustion residues, e.g fly ash, incineration waste
- C04B 33/138 from metallurgical processes, e.g. slag, furnace dust, galvanic waste
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