Preparation of pulverulent polymers of acrylic and/or methacrylic acid and use thereof
CA 2004146 A1 · Owner: Denzinger, Walter · Inventors: Denzinger, Walter; Fischer, Hermann; Hartmann, Heinrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
O.Z. 0050/40408, Abstract of the Disclosure: Pulverulent polymers of acrylic acid and methacrylic acid are prepared by polymerizing (a) from 100 to 70 % by weight of acrylic acid methacrylic acid or a mixture thereof and (b) from 0 to 30 % by weight of vinylsulfonic acid or an alkali metal salt thereof in a monohydric Cl-C8-alcohol water or a, mixture thereof in a pulverulent bed in the presence of a polymerization initiator and from 0.05 to 10 mol % of thiocarboxylic acid and/or a mercaptoalcohol and from 0.05 to 10 mol % of propionic acid or formic acid as regulators, each percentage being based on the monomers used in the polymerization, by maintaining the pulverulent state during the …
Read the whole patent
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 November 29, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 29, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 2011.
- 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.