Water-in-oil emulsion consisting of pyrolytic silica and a polysaccharide alkyl ether
CA 2243602 C · Owner: Sebillotte-Arnaud, Laurence · Inventors: Sebillotte-Arnaud, Laurence
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention involves a water-in-oil emulsion consisting of a liquid oily phase made up of at least pyrolytic silica and at least one polysaccharide alkyl ether comprised of units of at least two different oside cycles each unit consisting of at least one hydroxyl group substituted by a saturated hydrocarbonated chain and constituting from 0% to 5% of the total weight of the emulsion. The emulsion includes at least one emulsifying surfactant; the liquid oily phase contains at least one solvent medium for the polysaccharide alkyl ether. It is preferable that the polysaccharide alkyl ether have a molecular weight in excess of 200,000 and that it be an alkyl ether of guar gum with a degree of …
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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 August 27, 1998 and granted July 3, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 27, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 27, 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.