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DIFF Subgroup
C01B 17/22

Alkali metal sulfides or polysulfides

Introduced: September 1968

Full Title

Sulfur; Compounds thereof > Alkali metal sulfides or polysulfides

IPC and CPC are identically structured here. All 7 subcodes exist in both systems.

Child Classifications

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  • C01B 17/30 Preparation from sodium or potassium amalgam with sulfur or sulfides IPC+CPC Available in IPC and CPC
  • C01B 17/32 Hydrosulfides of sodium or potassium IPC+CPC Available in IPC and CPC
  • C01B 17/34 Polysulfides of sodium or potassium IPC+CPC Available in IPC and CPC
  • C01B 17/36 Purification IPC+CPC Available in IPC and CPC
  • C01B 17/38 Dehydration IPC+CPC Available in IPC and CPC
  • C01B 17/40 Making shaped products, e.g. granules IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class C01,2013–2023, worldwide · Source: EPO PATSTAT

  1. CHINESE ACADEMY OF SCIENCES 5,794
  2. SINOPEC (CHINA PETROCHEMICAL CORPORATION) 3,286
  3. LG CHEM KR 2,689
  4. BASF (BADISCHE ANILIN & SODA FABRIK) DE 1,669
  5. CENTRAL SOUTH UNIVERSITY 1,531
  6. KMUST (KUNMING UNIVERSITY OF SCIENCE AND TECHNOLOGY) 1,252
  7. SUMITOMO METAL MINING COMPANY JP 1,073
  8. ZHEJIANG UNIVERSITY 1,061
  9. PANASONIC INTELLECTUAL PROPERTY JP 1,058
  10. PANASONIC INTELLECTUAL PROPERTY 1,038

Top Applicants (CPC)

Class C01,2013–2023, worldwide · Source: EPO PATSTAT

  1. CHINESE ACADEMY OF SCIENCES 4,293
  2. LG CHEM KR 3,317
  3. BASF (BADISCHE ANILIN & SODA FABRIK) DE 2,219
  4. SINOPEC (CHINA PETROCHEMICAL CORPORATION) 2,154
  5. OMYA INTERNATIONAL CH 1,524
  6. PANASONIC INTELLECTUAL PROPERTY JP 1,362
  7. SAUDI ARABIAN OIL COMPANY SA 1,298
  8. SUMITOMO METAL MINING COMPANY JP 1,286
  9. CENTRAL SOUTH UNIVERSITY 1,243
  10. L'AIR LIQUIDE SOCIETE ANONYME POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE FR 1,238