Bleaching and bluing compositions and method
CA 1288552 C · Owner: Haendler, Blanca L. · Inventors: Haendler, Blanca L.; Cramer, Randall J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Liquid bleaching and coloring compositions are provided in which a polymeric matrix stably suspends pigment particles. A preferred composition includes an aqueous solution having sodium hypochlorite in an amount of from about 3.5 wt.% to about 6.2 wt.% an anionic or nonionic surfactant in an amount of from about 0.02 wt.% to about 5 wt.%, a polymer in an amount of from about 0.4 wt.% to about 0.6 wt.% and, ultramarine blue particles in an amount of from about 0.1 wt.% to 0.2 wt.%, the ultramarine blue particles being stably suspended and dispersed in the aqueous solution via the polymer.
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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
- Granted September 10, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 10, 2008.
- 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.