Polymers of oxyalkylated unsaturated quaternary ammonium salts, their preparation and their use
CA 1315465 C · Owner: Basf Aktiengesellschaft · Inventors: Oftring, Alfred; Goertz, Hans-Helmut; Vogel, Friedrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polymers are obtained by polymerization of water-soluble monomers which contain one or more polymerizable olefinic double bonds and a quaternary nitrogen atom which is substituted by one or more hydroxyalkyl groups and are present in the form of halide-free salts, with or without further comonomers.
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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 March 30, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 30, 2010.
- 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
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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.