Burning; Melting

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Hydraulic cements > Manufacture of hydraulic cements in general > Heat treatment, e.g. precalcining, burning, melting; Cooling > Burning; Melting

CPC:

Hydraulic cements (calcium sulfate cements C04B11/00) > Manufacture of hydraulic cements in general > Heat treatment, e.g. precalcining, burning, melting; Cooling > Burning; Melting

CPC subdivides this area 5x more granularly than IPC with 7 additional codes.

7 codes are CPC-only extensions.

Child Classifications

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C04B 7/4407 +4 CPC CPC only CPC only
C04B 7/4453 CPC only CPC only
C04B 7/4461 CPC only CPC only
C04B 7/4469 CPC only CPC only
C04B 7/4476 CPC only CPC only
C04B 7/4484 CPC only CPC only
C04B 7/4492 CPC only CPC only
C04B 7/45 in fluidised beds since 1985 IPC+CPC Available in IPC and CPC
C04B 7/46 electric 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