Chemical composition to produce water soluble curable films on fibrous surfaces and said treated fibers
CA 2039926 C · Owner: Ppg Industries, Inc. · Inventors: Parrinello, Luciano Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The chemical composition of the present invention is capable of forming a water soluble but curable film on fibers treated with the aqueous chemical composition to produce wet chopped strands of the fibers. In one aspect the chemical composition has a water soluble film-forming polymer with an intrinsic viscosity less than around 150 centipoise present in an effective amount to form a water soluble film. Tn addition the composition has at least one cationic lubricant or lubricating surfactant, polymer matrix-compatible organo silane coupling agents, epichlorohydrin polyamide adduct and water. The film forming polymer can be poly(vinylalcohol) poly(vinylpyrrolidone), or …
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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 April 5, 1991 and granted November 9, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 5, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 5, 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.