Sustained-release compositions and method for preparing same
CA 2286575 C · Owner: Pellet, Marc · Inventors: Pellet, Marc; Roume, Chantal
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns compositions in the form of microcapsules or implants comprising a biodegradable polymer or copolymer vehicle or mixture of vehicles with logarithmic viscosity number between 0.5 dl/g and 1.6 dl/g in CHCl¿3? and an active substance or mixture of active substances said microcapsules or implants being capable of releasing the active substance or mixture of active substances over a prolonged period up to three months or more. These compositions can also comprise an active substance with high specific surface area.
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 17, 1998 and granted June 5, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 17, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 17, 2020.
- 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.