Expired Canadian patentCanada
Organic solvent-free process for preparing pyrimidinyl organophosphates
CA 1310643 C · Owner: The Dow Chemical Company · Inventors: Johnson, Mark R.
Overview
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Pyrimidinyl organophosphorous compounds are prepared by contacting an aqueous solution containing a pyrimidinate with a phosphoroester in the presence of a phase transfer catalyst and in the absence of an added organic solvent.
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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 24, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 24, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 23, 1987
GrantedNovember 24, 1992
Term endedNovember 24, 2009
Patent numberCA 1310643 C
Classification (IPC)C07F9/65
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.