Expired Canadian patentCanada
Prostacyclin analogues
CA 1201435 A · Owner: Upjohn Company (The) · Inventors: Smith, Herman W.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel structural analogues of 5,6-dihydro PGI1 of the formula:, useful as antiallergy agents. CHART I II, III, IV, V, VI, VII, VIII, 'IMAGE~ 'III, VIII
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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 March 4, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 4, 2003.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 29, 1980
GrantedMarch 4, 1986
Term endedMarch 4, 2003
Patent numberCA 1201435 A
Classification (IPC)C07D209/52 +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.