IPC Main Group
C01D 5/00 Sulfates or sulfites of sodium, potassium, or alkali metals in general
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- CHEMISTRY; METALLURGY
- Class:
- INORGANIC CHEMISTRY
- Subclass:
- COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
7 direct subcodes
Child Classifications
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- C01D 5/02 Preparation of sulfates from alkali metal salts and sulfuric acid or bisulfates; Preparation of bisulfates
- C01D 5/04 Preparation of sulfates with the aid of sulfurous acid or sulfites, e.g. Hargreaves process
- C01D 5/06 Preparation of sulfates by double decomposition
- C01D 5/12 Preparation of double sulfates of magnesium with sodium or potassium
- C01D 5/14 Preparation of sulfites
- C01D 5/16 Purification
- C01D 5/18 Dehydration
Top Applicants
Top 10 applicants by patent filingsfor class C01, 2013–2023, worldwide · Source: EPO PATSTAT
- CHINESE ACADEMY OF SCIENCES 5,794
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 3,286
- LG CHEM KR 2,689
- BASF (BADISCHE ANILIN & SODA FABRIK) DE 1,669
- CENTRAL SOUTH UNIVERSITY 1,531
- KMUST (KUNMING UNIVERSITY OF SCIENCE AND TECHNOLOGY) 1,252
- SUMITOMO METAL MINING COMPANY JP 1,073
- ZHEJIANG UNIVERSITY 1,061
- PANASONIC INTELLECTUAL PROPERTY JP 1,058
- PANASONIC INTELLECTUAL PROPERTY 1,038