Method of manufacturing solid dispersion
CA 2108575 C · Owner: Izumi, Shogo · Inventors: Izumi, Shogo; Nakamichi, Kouichi; Yasuura, Hiroyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The object of this invention is to provide a process for producing a solid dispersion, which has overcome the disadvantages of the conventional production technology for solid dispersions The invention comprises employing a twin-screw extruder in the production of a solid dispersion. In accordance with the invention a solid dispersion can be, expediently produced without heating a drug and a polymer to or beyond their melting points and without using an organic solvent for dissolving both components and the resulting solid dispersion has excellent performance characteristics.
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 April 14, 1992 and granted October 22, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 14, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 14, 2014.
- 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.