DIFF Subgroup
C04B 7/36 Manufacture of hydraulic cements in general
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Hydraulic cements > Manufacture of hydraulic cements in general
CPC:
Hydraulic cements (calcium sulfate cements C04B11/00) > Manufacture of hydraulic cements in general
Of 7 combined children, 4 exist in both systems.
3 codes are CPC-only extensions.
1 shared codes have differing titles between IPC and CPC.
Child Classifications
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- C04B 7/38 Preparing or treating the raw materials individually or as batches IPC+CPC Available in IPC and CPC
- C04B 7/43 Heat treatment, e.g. precalcining, burning, melting; Cooling since 1985 +4 CPC IPC+CPC Available in IPC and CPC
- C04B 7/60 Methods for eliminating alkali metals or compounds thereof since 1985 IPC+CPC Available in IPC and CPC
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