Osmotically dependent vesicles
CA 2045122 A1 · Owner: The Liposome Company, Inc. · Inventors: Weiner, Alan L.; Fielder, Frank G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Osmotically derived liposomal vesicles loaded with an active agent are disclosed. Liposomes, including an entrapped osmotic agent are con-, tacted one or more times with a washing solution which is hypotonic to the entrapped osmotic agent and which contains active agent. The entrapped osmotic agent in the liposome and the active agent in the washing solution are each present in concentrations causing the liposomes to swell, rupture under osmotic pressure spill osmotic agent, into the washing solution and re-form to encapsulate active agent.
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 January 17, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 17, 2012.
- 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.