Surface-treated calcium carbonate, production method thereof, and resin composition containing the calcium carbonate
CA 2466261 C · Owner: Takahashi, Yoichi · Inventors: Hayashi, Yuusuke; Takahashi, Yoichi; Fukumoto, Katsunori
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The surface-treated calcium carbonate is disclosed which is surface-treated with an organic surface treating agent, said surface-treated calcium carbonate satisfies the particular BET specific surface area (Sw) reduced heat , amount per unit specific surface area (As) average pore , diameter (Dxp) at which an increased amount of mercury penetration reaches the maximum value in a method of mercury penetration, and amount of an average pore diameter maximum value of an increased amount of mercury penetration (Dyp) /average pore diameter (Dxp). The surface-treated calcium carbonate of the present invention is particularly useful for resins and it not only improves adhesion of resin …
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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 1, 2002 and granted June 26, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 1, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 1, 2024.
- 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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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.