Expired Canadian patentCanada
Controlled release naproxen tablets
CA 2175091 C · Owner: Sherman, Bernard Charles · Inventors: Sherman, Bernard Charles
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A controlled release pharmaceutical tablet suitable for daily dosing comprising naproxen and about 3 weight percent of HPMC having a number average molecular weight of about 190,000.
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 April 26, 1996 and granted January 5, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 26, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 26, 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.
FiledApril 26, 1996
GrantedJanuary 5, 1999
Term endedApril 26, 2016
Patent numberCA 2175091 C
Classification (IPC)A61K31/19 +2 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.