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Expired Canadian patentCanada

Bleaching and bluing compositions and method

CA 1288552 C · Owner: Haendler, Blanca L. · Inventors: Haendler, Blanca L.; Cramer, Randall J.

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Abstract 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.
FiledJanuary 24, 1985
GrantedSeptember 10, 1991
Term endedSeptember 10, 2008
Patent numberCA 1288552 C
Classification (IPC)C11D3/42 +2 more

Timeline

Timeline From CIPO dates

19861989199219951998200120042007Application filedJan 24, 1985Patent grantedSep 10, 1991Term endedSep 10, 2008

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.