Paper size comprising cationic starch and linear polymer having basic nitrogen atoms
CA 2587527 C · Owner: Lorenz, Klaus · Inventors: Dyllick-Brenzinger, Rainer; Schmid, Markus; Lorenz, Klaus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a paper sizing agent comprising a stable aqueous dispersion of a reactive sizing agent, 5 to 100 % by weight with regard to , the reactive sizing agent of an essentially linear nitrogen-containing polymer with at least 3 mmol/g of basic nitrogen atoms and 1 to 50 % by , weight of cationic starch with a degree of substitution of at least 0.05. The paper sizing agent exhibits a good sizing effect and has a constant viscosity.
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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 November 29, 2005 and granted April 28, 2015. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 29, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.