Polymers for cement dispersing admixtures
CA 2342061 C · Owner: Widmer, Jurg · Inventors: Burge, Theodor A.; Schober, Irene; Velten, Ulf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polymers for cement dispersing admixtures which show different performing properties in concrete are de- scribed. All polymers are based on a composition of reac- tants namely a) a poly(acrylic acid), b) a polyalkyleneglycol- monoalkylether and optionally c) a .alpha.-amino-polyalkylene- glycol-.omega.-alkylether and/or d) a primary or secondary amine. By keeping the composition of reactants constant and varying only the reaction time polymers with different properties can easily be achieved. Such polymers are suitable for pre- cast readymix or for increasing workability over time just depending on reaction time. Polymers of the invention can be used as single polymer or in polymer blends. …
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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
- Filed March 21, 2001 and granted September 6, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 21, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 21, 2023.
- 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.