Stain resistant polyamide substrate treated with sulfonated, phosphated resol resin
CA 2202215 C · Owner: Trichromatic Carpet Inc. · Inventors: Elgarhy, Yassin M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A treated fibrous polyamide substrate having durable resistance to staining by acid colorants comprising a fibrous polyamide substrate having applied thereto an aqueous solution of a sulfonated phosphated resol resin and a methacrylic polymer or copolymer of high number average molecular weight and, preferably high weight average molecular weight and optionally, fluorochemical; and the method of treating said substrate with the solution to render it durable to staining by acid colorants.
Read the whole patent
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 9, 1997 and granted March 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 9, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 2019.
- 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.