Surface modified fillers for sizing paper
CA 2336860 A1 · Owner: Minerals Technologies Inc. · Inventors: Gill, Robert Anthony
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hydrophobic filler material for neutral alkaline and acidic papers is , disclosed. The filler material comprises finely divided particles of an inorganic material, in admixture with a water miscible butyl acrylate-, acrylonitrile copolymer. A neutral or alkaline paper is disclosed. The neutral or alkaline paper comprises a hydrophobic filler material comprising inorganic material, in admixture with a water miscible butyl acrylate-acrylonitrile , copolymer. A method for improving sizing characteristics of neutral or alkaline paper is disclosed, comprising preparing a filler material and adding the same to cellulose fiber. The filler material is prepared by selecting particles of an …
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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 July 8, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 8, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 8, 2021.
- 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.