Skip to content
PCE
Search Classifications
Search for IPC and CPC classification codes or keywords
DIFF Main Group
C09B 50/00

Formazane dyes; Tetrazolium dyes

Introduced: July 1974

IPC and CPC are identically structured here. All 5 subcodes exist in both systems.

4 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1980.

Child Classifications

Navigate with arrow keys, Enter to open

  • C09B 50/02 Tetrazolium dyes since 1980 IPC+CPC Available in IPC and CPC
  • C09B 50/04 Metal-free formazan dyes since 1980 IPC+CPC Available in IPC and CPC
  • C09B 50/06 Bis-formazan dyes since 1980 IPC+CPC Available in IPC and CPC
  • C09B 50/08 Meso-acyl formazan dyes since 1980 IPC+CPC Available in IPC and CPC
  • C09B 50/10 Cationic formazan dyes since 1980 IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

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

Top Applicants (CPC)

Class C09,2013–2023, worldwide · Source: EPO PATSTAT

  1. LG CHEM KR 7,954
  2. HALLIBURTON ENERGY SERVICES GROUP US 6,584
  3. NITTO DENKO CORPORATION JP 6,500
  4. 3M INNOVATIVE PROPERTIES COMPANY (MINNESOTA MINING AND MANUFACTURING INNOVATIVE PROPERTIES COMPANY) US 6,490
  5. DOW GLOBAL TECHNOLOGIES US 6,324
  6. FUJIFILM JP 5,832
  7. MERCK PATENT DE 5,481
  8. BASF (BADISCHE ANILIN & SODA FABRIK) DE 5,147
  9. SAMSUNG DISPLAY KR 5,105
  10. NITTO DENKO CORPORATION 3,584