Process for preparing multi-colored dyed polyamide substrates
CA 2057652 A1 · Owner: Kelley, Larry C. · Inventors: Kelley, Larry C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This is a method for producing multi-colored polyamide dyeings which is particularly useful in the multi-colored dyeing of polyamide carpets. In this method a three-, component dyeing system is employed which comprises a fiber reactive dye, an anionic resist and an acid-type dye. The anionic resist is a water-soluble, fiber substantative compound which displaces and/or prevents the fiber-reactive dye form fixing in that portion of the carpet which has been treated with the resist. The anionic resist however, will not displace the acid-type dye component nor does it prevent fixation of the acid-type dye component. The invention may be practised by first printing the polyamide substrate in a …
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 December 13, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 13, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 13, 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.