Polymer composition and a method for producing the same
CA 2387516 A1 · Owner: Hartan, Hans-Georg · Inventors: Brehm, Helmut; Hartan, Hans-Georg
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to powder-form, cross-linked polymer compositions containing the following: a) 55-99.9 wt. % of at least one polymerised ethylenically unsaturated, polymerisable monomer containing acid groups said , monomer(s) being neutralised to at least 25 mol. %; b) 0-40 wt. % polymerised unsaturated monomers that are copolymerisable with a); c) 0.01-5.0 preferably , 0.1-2.0 wt. % of one or more cross-linking agents; and d) 0-30 wt. % of a water-soluble polymer, the proportions by weight a) to d) being in relation to the water-free polymerizate composition and the sum of the components always being 100 wt. %. The inventive compositions can be obtained by continuous …
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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 August 2, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 2, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 2, 2022.
- 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.