Novel treated filler or pigment or mineral for paper, containing natural caco3, providers of h3o+ ions and gaseous co2
CA 2356775 C · Owner: Gane, Patrick A. C. · Inventors: Blum, Rene Vinzenz; Gane, Patrick A. C.; Karth, Beat
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a pigment filler or a mineral containing natural calcium carbonate treated with one or several H¿3?O?+¿ ion donors and gaseous CO¿2? for reducing constant surface paper weight without loss of physical properties when it is used as mass or coating pigment for said paper. In particular the invention concerns a pigment, filler or mineral containing a natural carbonate calcium or dolomite, or talcum-calcium carbonate kaolin-calcium carbonate mixtures alone or combined with natural and/or synthetic fibres or the like treated with one or several H¿3?O?+¿ ion donors ranging from moderately strong to strong in the presence of CO¿2? gas. The invention is particularly …
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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 December 24, 1999 and granted June 5, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 24, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 24, 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
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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.