Selective thrombin inhibitors
CA 2188690 C · Owner: Hwang, Sang Yeul · Inventors: Shin, You Seung; Hong, Seong Won; Lee, Koo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a novel selective thrombin inhibitor having the following formula (I) which is also effec-, tive by oral administration: in which, R1 represents acetyl substituted with aryl or aryloxy or, represents sulfonyl substituted with substituted or unsubstituted aryl or N-containing heterocyclic group X represents a group of formula , R2 and R3 independently of one another represent hydrogen; cycloalkyl substituted or unsubstituted with carboxyl or alkoxycarbonyl; arylalkyloxy; hydroxy; or lower alkyl substi tuted or unsubstituted with carboxyl, alkoxycarbonyl or hydroxy, or, R2 and R3 together with nitrogen atom to which they are attached can form a piperidine …
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 October 23, 1996 and granted July 29, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 23, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 2018.
- 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.