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C01D 5/00

Sulfates or sulfites of sodium, potassium or alkali metals in general

Introduced: September 1968

Title

Titles differ between systems:

IPC: Sulfates or sulfites of sodium, potassium, or alkali metals in general

CPC: Sulfates or sulfites of sodium, potassium or alkali metals in general

Full Title

Full titles differ between systems:

IPC:

Sulfates or sulfites of sodium, potassium, or alkali metals in general

CPC:

Sulfates or sulfites of sodium, potassium or alkali metals in general

Of 11 combined children, 7 exist in both systems.

4 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

Child Classifications

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  • C01D 5/002 CPC only CPC only
  • C01D 5/004 CPC only CPC only
  • C01D 5/006 CPC only CPC only
  • C01D 5/008 CPC only CPC only
  • C01D 5/02 Preparation of sulfates from alkali metal salts and sulfuric acid or bisulfates; Preparation of bisulfates IPC+CPC Available in IPC and CPC
  • C01D 5/04 Preparation of sulfates with the aid of sulfurous acid or sulfites, e.g. Hargreaves process IPC+CPC Available in IPC and CPC
  • C01D 5/12 Preparation of double sulfates of magnesium with sodium or potassium IPC+CPC Available in IPC and CPC
  • C01D 5/16 Purification IPC+CPC Available in IPC and CPC
  • C01D 5/18 Dehydration 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