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Expired Canadian patentCanada

Detergents containing water-soluble copolymers containing as copolymerized units monomers having two or more ethylenically unsaturated double bonds

CA 1307437 C · Owner: Basf Aktiengesellschaft · Inventors: Winkler, Ekhard; Seelmann-Eggebert, Hans-Peter; Hartmann, Heinrich

CIPO record

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Abstract From the Canadian patent

O.Z. 0050/39183, Abstract of the Disclosure: A surfactant-based detergent contains water-soluble copolymers which contain a) from 99.5 to 15 mol % of one or more monoethylenically unsaturated C3- to C6-monocarboxylic acids b) from 0.5 to 20 mol % of one or more comonomers which contain two or more ethylenically unsaturated nonconjugated double bonds and have one or more -CO-OX groups where X is hydrogen, an alkali metal, one equivalent of an alkaline earth metal or ammonium, c) from 0 to 84.5 mol % of one or more monoethylenically unsaturated C4- to C6-dicarboxylic acids d) from 0 to 20 mol % of one or more hydroxyalkyl esters of monoethylenically unsaturated C3- to C6-carboxylic acids and, …

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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 15, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 15, 2009.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 12, 1988
GrantedSeptember 15, 1992
Term endedSeptember 15, 2009
Patent numberCA 1307437 C
Classification (IPC)C11D3/37

Timeline

Timeline From CIPO dates

1989199219951998200120042007Application filedMay 12, 1988Patent grantedSep 15, 1992Term endedSep 15, 2009

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