Preparing or treating the raw materials individually or as batches

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Hydraulic cements > Manufacture of hydraulic cements in general > Preparing or treating the raw materials individually or as batches

CPC:

Hydraulic cements (calcium sulfate cements C04B11/00) > Manufacture of hydraulic cements in general > Preparing or treating the raw materials individually or as batches

IPC and CPC are identically structured here. All 2 subcodes exist in both systems.

2 shared codes have differing titles between IPC and CPC.

Child Classifications

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C04B 7/40 Dehydrating; Forming, e.g. granulating (apparatus for granulating B01J2/00) IPC+CPC Available in IPC and CPC
C04B 7/42 Active ingredients added before, or during, the burning process (after the burning process C04B22/00, C04B24/00) +2 CPC 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