Process for the preparation of e-prostaglandins
CA 2129537 C · Owner: Kameo, Kazuya · Inventors: Amano, Takehiro; Kameo, Kazuya; Ono, Naoya
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Object: To produce E-prostaglandins in a high yield and in a short time with suppressed formation of isomers. Structure: A process for preparing E-prostaglandins represented by the formula:, (wherein A R6 and R7 represent respectively an arbitrary group which does not participate in the reaction; B represents a vinylene or ethynylene group; and R4 and R5 may be the same or different from each other and each represents a hydrogen atom or a protective group of the hydroxyl group) which comprises reacting allyl esters of E-prostaglandins represented by the formula: (wherein R1 and R2 may be the same or different from each other and each represents a hydrogen atom or a lower alkyl group; R3 …
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
- Filed February 2, 1993 and granted May 7, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 2, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 2, 2015.
- 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.