2-(2-vinylpyrrolidinylthio)carbapenem derivatives
CA 2022681 C · Owner: Nakano, Fumio · Inventors: Nakagawa, Susumu; Ushijima, Ryosuke; Nakano, Fumio
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:, (I), wherein R1 is a hydrogen atom or a methyl group R2 is a, hydrogen atom or a lower alkyl group each of R3, R4 and, R5 is a hydrogen atom or a lower alkyl group or R3 and, R4 together form a methylene group an ethylene group or, a propylene group or R4 and R5 form together with the, adjacent nitrogen atom an aziridinyl group an azetidinyl, group, a pyrrolidinyl group a piperidino group, a, piperazinyl group or a morpholino group; or a pharmaceutically acceptable salt or ester thereof.
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 August 3, 1990 and granted June 18, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 3, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 3, 2012.
- 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.