15-dehydroxy-16-oxoprostaglandins
CA 2037009 C · Owner: Ueno Technology Co. Ltd. · Inventors: Ueno, Ryuji; Oda, Tomio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compound of the formula:, (see fig, I) wherein, L and M axe hydrogen atom, hydroxy lower alkyl, hydroxy (lower) alkyl or oxo provided that at least one of L and M is not hydrogen atom and that the five-membered ring may have one or two double bonds, X1 and X2 are hydrogen atom halogen atom or lower alkyl, Y is -CH2-CH2- -CH=CH-, -C=C- or -CO-CH2-, Z is -CH2-CH2-CH2- -CH=CH-CH2 or -CH2-CH=CH-, R is hydxogen atom lower alkyl, lower cycloalkyl, monocyclic aryl monocyclic aryl (lower)alkyl or, monocyclic aroyl(lower)alkyl R2 is single bond or lower alkylene, - 62 - R3 is lower alkyl which is unsubstituted or substituted with halogen, lower cycloalkyl which is unsubstituted or substituted with …
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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
- Filed February 25, 1991 and granted January 27, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 2013.
- 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.