Liposome extrusion process
CA 2091776 C · Owner: Thies, Robert L. · Inventors: Portnoff, Joel B.; Thies, Robert L.; Coe, Royden M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of sizing liposomes by passing a suspension of liposomes through an aluminum oxide porous film under pressure is disclosed. In a preferred embodiment the porous film is a branched type , anodic aluminum oxide porous film. The process produces a population of liposomes substantially free of liposomes above a predetermined maximum size useful in administering drugs or other bioactive agents, such as in the treatment of cancer or AIDSrelated illnesses. Also disclosed for carrying out the method is an apparatus comprising one or more fitter assemblies for holding the aluminum oxide porous film in operational configuration (33), a pressurized supply vessel for supplying the suspension …
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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 October 4, 1991 and granted August 31, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 4, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 4, 2013.
- 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.