Treatment of fabrics
CA 2243339 A1 · Owner: Imperial Chemical Industries Plc · Inventors: Hajarnis, Umed Dattatry; Arumugaswamy, Ramiah; Dike, Suneel Yeshwant
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Fibrous cellulosic material is treated by applying an aqueous solution including a polycarboxylic acid crosslinking agent and an organic or inorganic sulphonic or sulfinic acid particulalry p-toluene, sulphonic acid methane sulphonic acid and dodecyl benzene sulphonic acid or salt particularly alkali, metal, ammonium or alkaline earth metal salts as an esterification catalyst, drying the fabric and heating it to promote crosslinking esterification of the polycarboxylic acid and the cellulose of the fibrous cellulosic material to give fabric with improved wrinkle and/or crease and/or shrink resistance and/or smooth drying properties. The method has the advantage that it does not use …
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 July 17, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 17, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 17, 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
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.