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Expired Canadian patentCanada

Manufacturing and using nitrogen fertilizer solutions on a farm

CA 1089665 A · Owner: Eastin, John A. · Inventors: Eastin, John A.

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

To make and use nitrogenous fertilizer on a farm nitrogen, dioxide is prepared in a continuous process from air or from ammonia in a reactor, with the ammonia either being transported to the farm or being prepared on the farm in a continuous process from water and air. The nitrogen dioxide is mixed with a continuous flow of water to form a dilute solution of nitric acid, which may be applied to the field through the irrigation system as top dressing or mixed within the irrigation system with ammonia or other cations to form ammonium nitrate or other desired nitrogen solutions for application to the fields in a continuous process or conecntrated without requiring storage of large acounts of …

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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.

Why it's free to use

  • Granted November 18, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 18, 1997.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 13, 1976
GrantedNovember 18, 1980
Term endedNovember 18, 1997
Patent numberCA 1089665 A
Classification (IPC)C05C5/00 +2 more

Timeline

Timeline From CIPO dates

1977198019831986198919921995Application filedMay 13, 1976Patent grantedNov 18, 1980Term endedNov 18, 1997

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.