Prostacyclin (pgi ) analogues
CA 1284642 C · Owner: Takechi, Shozo · Inventors: Mori, Sachio; Takechi, Shozo; Iwakura, Hikozo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Prostacyclin (PGI 2 ) analogues represented by the formula: wherein R1 is hydrogen or lower alkyl; R2 is lower alkyl lower, alkenyl, lower alkynyl, lower aralkynyl lower alkyloxy, arythio, or cyano; R3 and R4 each is hydrogen or hydroxy-protecting group; R6 is straight or branched alkyl which may be substituted with heterocycle, straight or branched alkynyl or cycloalkyl; the wavy, line indicates R- or S-configuration or their mixture; or a, salt thereof being used as antithrombotic and antiulcer drugs.
Read the whole patent
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 June 4, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 4, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.