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IPC Subclass
C05C

NITROGENOUS FERTILISERS

Introduced: September 1968

Classification Context

Section:
CHEMISTRY; METALLURGY
Class:
FERTILISERS; MANUFACTURE THEREOF
Subclass:
NITROGENOUS FERTILISERS

Description

C05C covers nitrogenous fertiliser compositions and their manufacturing processes. This subclass includes ammonia-based fertilisers, nitrate salts, urea compounds, ammonium salts, and complex fertilisers containing nitrogen as a primary nutrient. Manufacturing methods for nitrogen fertilisation products, such as the synthesis of ammonia, nitric acid production, and granulation or prilling of nitrogen-containing compounds, fall within this classification. Adjacent subclasses C05A and C05B address organic fertilisers and phosphatic/potassic fertilisers respectively, while C05F and C05G cover compound fertilisers and methods not specific to single nutrient types.

Filing statistics

IPC subclass C05C recorded 6,180 patent applications worldwide between 2013 and 2023. Annual filings declined from 485 in 2013 to 382 in 2023 (-21%), peaking at 713 applications in 2019. The most active applicants in class C05 are CHINESE ACADEMY OF SCIENCES (895 applications), BASF (BADISCHE ANILIN & SODA FABRIK) (387 applications) and GUIZHOU UNIVERSITY (386 applications).

Source: EPO PATSTAT, worldwide filings

Additional Content

Glossary

Fertiliser (fertiliser material) Natural or artificial substance containing the chemical elements that improve growth and productiveness of plants. Nitrogenous fertiliser – see also "Special rules" above when more than one element present Fertiliser materials, natural or synthesized, containing nitrogen available for fixation by vegetation, such as potassium nitrate, KNO3, or ammonium nitrate, NH4NO3

Limiting references

PHOSPHATIC FERTILISERS INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES , ; FERTILISERS PRODUCING CARBON DIOXIDE ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES , , e.g. FERTILISERS FROM WASTE OR REFUSE

Related Keywords

nitrogenous FERTILISERS

7 direct subcodes

Child Classifications

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  • C05C 11/00 Other nitrogenous fertilisers
  • C05C 13/00 Mixtures of nitrogenous fertilisers covered by more than one of main groups
  • C05C 3/00 Fertilisers containing other salts of ammonia or ammonia itself, e.g. gas liquor

Top Applicants

Top 10 applicants by patent filingsfor class C05, 2013–2023, worldwide · Source: EPO PATSTAT

  1. CHINESE ACADEMY OF SCIENCES 895
  2. BASF (BADISCHE ANILIN & SODA FABRIK) DE 387
  3. GUIZHOU UNIVERSITY 386
  4. YARA INTERNATIONAL NO 380
  5. SHENZHEN BATIAN ECOTYPIC ENGINEERING COMPANY 378
  6. SHANDONG SUNWAY LANDSCAPE TECHNOLOGY COMPANY 327
  7. GUILIN JIEYU ENVIRONMENTAL PROTECTION SCIENCE & TECHNOLOGY COMPANY 283
  8. CHINA AGRICULTURAL UNIVERSITY 271
  9. GUANGXI UNIVERSITY 266
  10. NANJING AGRICULTURAL UNIVERSITY 231