Aminophosphonate-containing polymers
CA 2017786 C · Owner: Ablestik Laboratories · Inventors: Iovine, Carmine; Leighton, John C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides novel aminophosphonate-containing polymers of the following structure:, (I), wherein A represents repeating units derived from one or more ethylenically unsaturated comonomers, and, B is, (II) wherein, R is hydrogen or methyl, X is hydrogen or an alkali metal Z is CH2 - P(O)(OX)2 or C1 - C6 alkyl, aryl cyclohexyl or alkaryl; and, n and m are positive integers m/n = 0.01 to 0.50, and preferably m/n is 0.01 to 0.25. The polymers are useful as dispersants for concentrated aqueous slurries.
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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 May 30, 1990 and granted April 27, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 30, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 30, 2012.
- 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.