Process for the preparation of microcapsules or liposomes of controlled sizes
CA 2133421 C · Owner: Centre National De La Recherche Scientifique (C.N.R.S.) · Inventors: Laversanne, Rene; Diat, Olivier; Roux, Didier
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the preparation of microcapsules with controlled sizes in which a homogeneous liquid crystal lamellar phase is prepared comprising at least one surfactant and at least one solvent and if , need be, one substance to be encapsulated. The invention is characterized in that the lamellar phase is subjected to constant shearing.
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 2, 1993 and granted July 15, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 2, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 2, 2015.
- 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.