High molecular weight acrylic anti-stain treatment for nylon carpet
CA 2024600 A1 · Owner: Blankenship, Robert M. · Inventors: Morris Hal C.; Blankenship, Robert M.; Blankenship, Robert M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Described is a method for treating fiber with a durable antistain agent containing a copolymer of 1-20 weight % acrylic acid and about 80-99 weight % methacrylic acid that has a weight, average molecular weight greater than 80,000 preferably above, 1000,000, more preferably above 130,000 and a fiber impregnated with, such an anti-stain agent. The anti-stain agent can be used in treating carpets made of nylon 6 and nylon 66 fiber and effectively withstand carper shampooing.
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 September 4, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 4, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 4, 2012.
- 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.