Expired Canadian patentCanada
Dextromethorphan antitussive compositions
CA 2129676 C · Owner: The Procter & Gamble Company · Inventors: Smith, Ronald Lee
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The subject invention involves antitussive pharmaceutical composition for the peroral administration of dextromethorphan, the composition being at a pH of from about 8 to about 11.
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 21, 1991 and granted September 30, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 21, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 21, 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.
FiledOctober 21, 1991
GrantedSeptember 30, 1997
Term endedOctober 21, 2011
Patent numberCA 2129676 C
Classification (IPC)A61K31/48 +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.