Silica by precipitation at constant alkali number, and its use
CA 2376654 A1 · Owner: Lindner, Gottlieb-Georg · Inventors: Kuhlmann, Robert; Lindner, Gottlieb-Georg; Drexel, Claus-Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are precipitated silicas obtainable by acid precipitation of aqueous silicate solutions while maintaining a constant alkali number of at least 1 having, good sorption characteristics for polar compounds. The precipitated silicas are useful as carrier material for choline chloride for example, and feed additives chemical, intermediates and in laundry detergent.
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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 13, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 13, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 13, 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
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.