Expired Canadian patentCanada
Process for preparing cimetidine polymorph b
CA 1301767 C · Owner: Kirkpatrick, David Samuel · Inventors: Graboyes, Harold; Kirkpatrick, David Samuel
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel process for preparing cimetidine polymorph "B" comprises precipitating cimetidine from an aqueous-alcoholic solution of an acid addition salt. The precipitation is conducted at a temperature of above15°C..
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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 May 26, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 2009.
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FiledJuly 27, 1987
GrantedMay 26, 1992
Term endedMay 26, 2009
Patent numberCA 1301767 C
Classification (IPC)C07D233/64 +1 more
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.