Sustained release diltiazem formulation
CA 2004565 A1 · Owner: Chang, Richard R. · Inventors: Pereira-Rosario, Ronald; Chang, Richard R.; Rudnic, Edward M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sustained release diltiazem tablet is disclosed which exhibits a unique dissolution profile due in large measure to the inclusion of the drug into a hydrophobic matrix. In particular, the sustained release diltiazem formulation disclosed herein is suitable for once-a-day administration.
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 November 28, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 28, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 28, 2011.
- 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.