Method and composition for whitening textiles
CA 2324067 A1 · Owner: Schoots, Harrie Peter · Inventors: Schoots, Harrie Peter; Tong-Chau Ko, Jeremy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a system for bleaching greige fabric using a two component reducing solution, wherein the first component of the reducing solution is added to, the second component just prior to treatment of the greige fabric. The first component of the reducing solution comprises 0.1 to 0.3 wt% borohydride and the, second component of the reducing solution comprises bisulfite in water wherein, there is a stoichiometric excess of the bisulfite relative to the borohydride.
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 October 23, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 23, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 2022.
- 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.