Treatment of fibrous substrates to impart repellency, stain resistance, and soil resistance
CA 2287494 C · Owner: Kamrath, Robert F. · Inventors: Burleigh, Malcolm B.; Newland, John C.; Schaffer, Kevin R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is described which imparts exceptional antisoiling anti-staining , and repellent properties to carpets. The process makes use of a water-based exhaustion process wherein the water-based treating solution contains (1) glassy fluorochemical material, glassy hydrocarbon material or combinations , thereof; (2) a stainblocking material; (3) a polyvalent metal salt acid, or , combinations thereof; and (4) water. Subsequent to exhaustion the wet treated , carpet is heated, usually in a steaming step rinsed, and dried in a dry heat , oven.
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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 20, 1998 and granted November 1, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 20, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 20, 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
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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.