Expired Canadian patentCanada
Pharmaceutical preparation
CA 1289075 C · Owner: F. Hoffmann-La Roche Ag · Inventors: Shah, Navnit H.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Pharmaceutical compositions for controlled release of water soluble drugs are disclosed. The compositions comprise a tablet core containing the drug and a water insoluble polymeric matrix surrounded with a rate controlling membrane coating.
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
- Granted September 17, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 17, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 14, 1986
GrantedSeptember 17, 1991
Term endedSeptember 17, 2008
Patent numberCA 1289075 C
Classification (IPC)A61K9/36 +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.