Improved retard systems for the sustained release of medicinal and/or biological valuable materials from a depot carrier material
CA 2108680 A1 · Owner: Henkel Kommanditgesellschaft Auf Aktien · Inventors: Lehmann, Rudolf; Sorg, Rainer; Ritter, Wolfgang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure The invention, in a first embodiment, relates to the use of free radical-reactive cross-linker components based on olefinically unsaturated esters of lower hydroxycarboxylic acids and/or oligomers thereof for modifying depot materials and especially retard systems, which contain medicinal and/or biological valuable materials in admixture with a carrier material in a sustained release of the active substance(s) in practical application. The cross-linkers are present as polymer compounds in the application form of the retard system and may be provided in the retard system or depot material to be applied in a largely homogeneous as well as in a non-uniform …
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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 April 11, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 11, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 11, 2014.
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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.