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IPC Subclass
C09C

TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES; PREPARATION OF CARBON BLACK

Introduced: September 1968

Last revised: January 1985

Classification Context

Section:
CHEMISTRY; METALLURGY
Class:
DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
Subclass:
TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES; PREPARATION OF CARBON BLACK

Description

C09C covers physical and chemical treatment methods applied to inorganic materials to improve their performance as pigments or fillers in paints, coatings, plastics, and related compositions. This includes surface modification, coating, grinding, and purification of mineral pigments and fillers, as well as the synthesis and processing of carbon black from carbonaceous sources. The subclass excludes fibrous fillers (covered elsewhere) and focuses on particulate inorganic solids that enhance color, opacity, or mechanical properties of end-use formulations.

Filing statistics

IPC subclass C09C recorded 23,000 patent applications worldwide between 2013 and 2023. Annual filings declined from 2,433 in 2013 to 1,531 in 2023 (-37%), peaking at 2,476 applications in 2014. The most active applicants in class C09 are LG CHEM (6,420 applications), NITTO DENKO CORPORATION (5,752 applications) and HALLIBURTON ENERGY SERVICES GROUP (5,650 applications).

Source: EPO PATSTAT, worldwide filings

Additional Content

Treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone , ,

Related Keywords

CARBON; inorganic compounds of CARBONCHEMISTRY of inorganic pigmentsinorganic PIGMENTS

2 direct subcodes

Child Classifications

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Top Applicants

Top 10 applicants by patent filingsfor class C09, 2013–2023, worldwide · Source: EPO PATSTAT

  1. LG CHEM KR 6,420
  2. NITTO DENKO CORPORATION JP 5,752
  3. HALLIBURTON ENERGY SERVICES GROUP US 5,650
  4. 3M INNOVATIVE PROPERTIES COMPANY (MINNESOTA MINING AND MANUFACTURING INNOVATIVE PROPERTIES COMPANY) US 5,635
  5. DOW GLOBAL TECHNOLOGIES US 4,844
  6. MERCK PATENT DE 4,779
  7. CHINESE ACADEMY OF SCIENCES 4,311
  8. FUJIFILM JP 4,205
  9. BASF (BADISCHE ANILIN & SODA FABRIK) DE 4,039
  10. SINOPEC (CHINA PETROCHEMICAL CORPORATION) 3,931