Process for producing liquid-loaded powders
CA 2031095 A1 · Owner: Cline, John F. · Inventors: Nichols, Larry D.; Cline, John F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The specification describes a process for producing liquid-loaded powders which are capable of releasing their liquid load when subjected to shearing forces. A cellulosic polymer and a liquid load are dissolved in a polar solvent to form a solution. The solvent is then dispersively evaporated from the solution to form a liquid-loaded powder. Dispersive evaporation of the solvent in a spray drying tower is described. Cellulosic polymers exemplified in the specification include cellulose triacetate an ethyl, cellulose and a cellulose propionate. Solvents exemplified include methylene chloride, ethyl acetate and acetone. Uses of the liquid-loaded powder described include a carrier for …
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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 November 29, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 29, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 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.