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DIFF Subgroup
C04B 2/12

in shaft or vertical furnaces (shaft or vertical furnaces in general F27B1/00)

Introduced: January 1985

Title

Titles differ between systems:

IPC: in shaft or vertical furnaces

CPC: in shaft or vertical furnaces (shaft or vertical furnaces in general F27B1/00)

Full Title

Full titles differ between systems:

IPC:

Lime, magnesia or dolomite > Preheating, burning, calcining or cooling > in shaft or vertical furnaces

CPC:

Lime, magnesia or dolomite (hydraulic lime cements C04B7/34) > Preheating, burning calcining or cooling (decarbonation during burning of cement raw materials C04B7/43; ) > in shaft or vertical furnaces (shaft or vertical furnaces in general F27B1/00)

No child classifications to compare. This is a leaf node in both IPC and CPC.

Top Applicants

Top Applicants (IPC)

Class C04,2013–2023, worldwide · Source: EPO PATSTAT

  1. CHINESE ACADEMY OF SCIENCES 2,095
  2. WUHAN UNIVERSITY OF TECHNOLOGY 1,205
  3. NGK INSULATORS JP 1,133
  4. HALLIBURTON ENERGY SERVICES GROUP US 1,049
  5. SIKA TECHNOLOGY CH 1,041
  6. GUILIN UNIVERSITY OF TECHNOLOGY 807
  7. WUHAN UNIVERSITY OF SCIENCE AND TECHNOLOGY 806
  8. SOUTHEAST UNIVERSITY 801
  9. CORNING US 777
  10. UNITED STATES GYPSUM COMPANY US 739

Top Applicants (CPC)

Class C04,2013–2023, worldwide · Source: EPO PATSTAT

  1. HALLIBURTON ENERGY SERVICES GROUP US 2,158
  2. CHINESE ACADEMY OF SCIENCES 1,569
  3. NGK INSULATORS JP 1,504
  4. SIKA TECHNOLOGY CH 1,181
  5. CORNING US 974
  6. WUHAN UNIVERSITY OF TECHNOLOGY 926
  7. UNITED STATES GYPSUM COMPANY US 882
  8. GE (GENERAL ELECTRIC COMPANY) US 828
  9. MITSUBISHI MATERIALS CORPORATION JP 792
  10. SAUDI ARABIAN OIL COMPANY SA 686