C04B 7/42 Active ingredients added before, or during, the burning process (after the burning process C04B22/00, C04B24/00)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Active ingredients added before, or during, the burning process
CPC: Active ingredients added before, or during, the burning process (after the burning process C04B22/00, C04B24/00)
Full Title
Full titles differ between systems:
Hydraulic cements > Manufacture of hydraulic cements in general > Preparing or treating the raw materials individually or as batches > Active ingredients added before, or during, the burning process
Hydraulic cements (calcium sulfate cements C04B11/00) > Manufacture of hydraulic cements in general > Preparing or treating the raw materials individually or as batches > Active ingredients added before, or during, the burning process (after the burning process C04B22/00, C04B24/00)
Of 2 combined children, 0 exist in both systems.
2 codes are CPC-only extensions.
Child Classifications
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Top Applicants
Top Applicants (IPC)
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
Top Applicants (CPC)
Class C04,2013–2023, worldwide · Source: EPO PATSTAT
- HALLIBURTON ENERGY SERVICES GROUP US 2,158
- CHINESE ACADEMY OF SCIENCES 1,569
- NGK INSULATORS JP 1,504
- SIKA TECHNOLOGY CH 1,181
- CORNING US 974
- WUHAN UNIVERSITY OF TECHNOLOGY 926
- UNITED STATES GYPSUM COMPANY US 882
- GE (GENERAL ELECTRIC COMPANY) US 828
- MITSUBISHI MATERIALS CORPORATION JP 792
- SAUDI ARABIAN OIL COMPANY SA 686