Prostacyclins and pharmaceuticals containing the same
CA 1290331 C · Owner: Kanayama, Toshiji · Inventors: Iseki, Katsuhiko; Shinoda, Masaki; Hayashi, Yoshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There are disclosed a prostacyclin represented by the formula:, wherein R1 represents -CO2R5 group where R5 represents a hydrogen atom, an alkyl group, an aralkyl group a, cycloalkyl group or a monoequivalent cation or -CONR6R7, group where R6 and R7 each represents a hydrogen atom an alkyl group or form a 5 or 6-membered ring combindly with nitrogen atom bonded thereto; A represents -CH=CH-CH2CH2- or -CH2CH2-O-CH2-; B represents -C?Cgroup; R2 represents an alkyl group, a cycloalkyl group an alkenyl group, an alkynyl group, a phenyl group or a phenoxy group or an alkoxy group; R3 represents a hydrogen atom, a methyl group or a vinyl group; R4 represents a hydrogen atom, an acyl group, a …
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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 October 8, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 8, 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.