Hydrophilic compositions which are fog-resistant
CA 2111468 C · Owner: Creasy, Walter S. · Inventors: Creasy, Walter S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polymer composition in the form of an alloy is disclosed having hydrophilic , and anti-fogging properties. The polymer alloy can be used as a coating, as an unsupported film or as a substrate having the desired anti-fogging properties. The composition can be used where hydrophilic properties are desired. Surfaces coated with the composition described herein are more readily wetted by water or aqueous fluids and may have a coefficient of , friction of 0.10 or less when in contact with water. The preferred composition contains a water-soluble polyvinyl alcohol and a watersoluble polyvinyl pyrollidone polymer in a weight ratio of about 4:1 to about 1:10. A crosslinking agent comprised …
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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 May 11, 1993 and granted November 30, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 11, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 11, 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.