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IPC Main Group
C01D 9/00

Nitrates 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

Filing statistics

IPC C01D 9/00 belongs to the parent subclass C01D, which recorded 19,597 patent applications worldwide between 2013 and 2023. Annual filings grew from 1,092 in 2013 to 2,774 in 2023 (+154%). The most active applicants in class C01 are CHINESE ACADEMY OF SCIENCES (5,794 applications), SINOPEC (CHINA PETROCHEMICAL CORPORATION) (3,286 applications) and LG CHEM (2,689 applications).

Source: EPO PATSTAT, worldwide filings

7 direct subcodes

Child Classifications

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  • C01D 9/02 Preparation by working-up natural salt mixtures
  • C01D 9/04 Preparation with liquid nitric acid
  • C01D 9/06 Preparation with gaseous nitric acid or nitrogen oxides
  • C01D 9/16 Purification
  • C01D 9/18 Preparation in the form of shaped products, e.g. granules
  • C01D 9/2 Preventing the absorption of moisture or caking

Top Applicants

Top 10 applicants by patent filingsfor 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