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CPC Subclass Not Allocatable
C04B

LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE ; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE

Description

C04B covers the manufacture, composition, and properties of inorganic binding materials and their derivatives, including lime, magnesia, and cementitious materials (Portland cement, slag cements, etc.), as well as their composite applications in mortars, concrete, and other building materials. The class encompasses artificial stone production, ceramic materials and manufacturing processes, and refractory compositions designed for high-temperature applications. Also included are methods and materials for treating, processing, or modifying natural stone products for construction or industrial use.

Filing statistics

CPC subclass C04B recorded 228,252 patent applications worldwide between 2013 and 2023. Annual filings grew from 10,861 in 2013 to 20,066 in 2023 (+85%), peaking at 27,356 applications in 2018. The most active applicants in class C04 are HALLIBURTON ENERGY SERVICES GROUP (2,158 applications), CHINESE ACADEMY OF SCIENCES (1,569 applications) and NGK INSULATORS (1,504 applications).

Source: EPO PATSTAT, worldwide filings

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Top Applicants

Top 10 applicants by patent filingsfor 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