Sustained-release pharmaceutical composition
CA 2259098 A1 · Owner: Meiji Seika Kaisha, Ltd. · Inventors: Shibayama, Masako; Tomosawa, Takashi; Saito, Yuji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a sustained-release pharmaceutical composition comprising a hydroxyalkanoic acid copolymer consisting of a 3-hydroxybutyric acid unit and a 4-hydroxybutyric acid unit and a, biologically active substance. The sustained-release pharmaceutical composition of the present invention can regulate the degree of release of a biologically active agent easily by changing the ratio of the 3-hydroxybutyric acid (3HB) component to the 4-hydroxybutyric acid (4HB) component in P(3HB-co-4HB) as a basic substance and by changing the thickness of its sheet.
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 January 12, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 12, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 12, 2021.
- 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.