Process for the preparation of anionic clay and boehmite-containing compositions, compositions containing anionic clay and boehmite and catalysts derived therefrom
CA 2437607 A1 · Owner: Akzo Nobel N.V. · Inventors: Jones, William; Stamires, Dennis; O'Connor, Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a process for the preparation of anionic clay and boehmite-containing compositions, to anionic clay and boehmite-containing compositions and to catalysts comprising such compositions. These compositions may also contain unreacted trivalent metal source and/or divalent metal source. The process involves subjecting a precursor mixture comprising a divalent metal source and a trivalent metal source to at least two aging steps, wherein at least once between two aging steps an aluminium source is added. An advantage of the invention is that the crystallinity of the boehmite in the composition can be tuned.
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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 February 5, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 5, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 5, 2024.
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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.