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IPC Subgroup
C04B 35/82

Asbestos; Glass; Fused silica

Introduced: January 1980

Last revised: January 2006

Full Title

Shaped ceramic products characterised by their composition; Ceramic compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products > Ceramic products containing macroscopic reinforcing agents > containing non-metallic materials > Fibres, filaments, whiskers, platelets, or the like > Asbestos; Glass; Fused silica

Classification Context

Section:
CHEMISTRY; METALLURGY
Class:
CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
Subclass:
LIME; MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE

Top Applicants

Top 10 applicants by patent filingsfor 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