Medicament sustained-release particles and method for preparing the same
CA 2529475 C · Owner: Otsuka Pharmaceutical Co. Ltd. · Inventors: Tomohira, Yuso
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides theophylline sustained release particles which contain a polyglycerol fatty acid ester as a matrix base material, which have a homogenous nucleus particle structure, which can effectively mask the unpleasant taste of medicaments, and which exhibit an excellent sustained medicament releasability (dissolvability) and outstanding storage stability. In particular, the present invention provides among , other things, a method for preparing theophylline sustained release particles comprising the steps of heating a matrix base material containing a polyglycerol fatty acid ester theophylline , and ethyl cellulose to give a molten mixture; spray-cooling the …
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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 June 17, 2004 and granted August 7, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 17, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 17, 2026.
- 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.