Expired Canadian patentCanada
Sustained-release drug preparation
CA 1309656 C · Owner: Watanabe, Sumio · Inventors: Andoh, Hidenobu; Watanabe, Sumio; Miyake, Yasuo
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 sustained-release drug preparation comprises a water-soluble drug, a lipidic substance and an oil as its essential components. The drug level in the blood is sustained at a preferable concentation for a long period of time.
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 November 3, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 3, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 17, 1987
GrantedNovember 3, 1992
Term endedNovember 3, 2009
Patent numberCA 1309656 C
Classification (IPC)A61K9/22 +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.