Expired Canadian patentCanada
Pyridinium nitrate, its production and use
CA 2008771 C · Owner: Tsushima, Susumu · Inventors: Takatani, Muneo; Tsushima, Susumu; Nishikawa, Kohei
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel compound of the formula:, is useful as a platelet activating factor antagonist and is so stable that it is advantageously used as drugs.
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 January 29, 1990 and granted March 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 29, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 29, 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.
FiledJanuary 29, 1990
GrantedMarch 23, 1999
Term endedJanuary 29, 2010
Patent numberCA 2008771 C
Classification (IPC)C07D401/12 +1 more
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.