Solid depot drug form
CA 2082573 C · Owner: Basf Aktiengesellschaft · Inventors: Grabowski, Sven; Mueller, Winfried; Sanner, Axel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A solid depot drug form, produced by melt extrusion at from 50 to 200°C and continuous shaping of a mixture of from 0.1 to 70% by weight, based on the finished depot form of a pharma-, ceutical active ingredient with a polymer melt of the following composition:, a) at least 6% by weight based on the complete depot, form, of at least one water-insoluble poly(meth)acrylate with a glass transition temperature Tg in the range from -60 to 180°C, b) a water-soluble hydroxyalkylcellulose or hydroxyalkylmethylcellulose with 2 or 3 carbons in the hydroxyalkyl, or an N-vinylpyrrolidone polymer with from 0 to 50% by weight of vinyl acetate or a mixture of the two, in the ratio a):b) = 5:95 to 95:5 …
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 November 10, 1992 and granted July 30, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 10, 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.