Silica-calcium carbonate composite particle
CA 2400128 A1 · Owner: Mitsuhashi, Kouhei · Inventors: Tanabe, Katsuyuki; Mitsuhashi, Kouhei
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Silica-calcium carbonate composite particles characterized in that they are , produced by a method wherein in a carbonation step of forming calcium carbonate, typically a step of introducing a mixed gas of carbon dioxide and air into a calcium hydroxide slurry with stirring to carry out a carbonization reaction, a synthetic silica such as colloidal silica is added in a period after the start of the carbonization and before carbonization percentage reaches 95 %, the mixed gas is continuously introduced thereafter to continue the carbonization, and the carbonization is stopped when the pH of the slurry reaches 7; a paper having said particles filled therein; and the above method. Said …
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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 March 2, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 2, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 2, 2023.
- 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.