Dispersant for colorant formulation
CA 2048124 A1 · Owner: Zimmermann, Norbert · Inventors: Zimmermann, Norbert; Denzinger, Walter; Herrmann, Manfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
O.Z. 0050/41794, Abstract of the Disclosure: Compositions of matter suitable for use as dispersants for colorant formulations are composed of, A) from 10 to 70 % by weight of a water-soluble salt of a copolymer of, a) from 40 to 80 % by weight of an aromatic vinyl compound, b) from 20 to 60 % by weight of an olefinically unsaturated acid or anhydride and, c) from 0 to 20 % by weight of further monomer B) from 30 to 90 % by weight of a dextrin or natural protein and, C) from 0 to 10 % by weight of a further customary dispersant.
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 July 30, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 30, 2013.
- 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.