Process for making aluminoxanes
CA 2252365 A1 · Owner: Roberg, John K. · Inventors: Roberg, John K.; Burt, Edward A.; Farritor, Robert E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Water, hydrocarbylaluminum (e.g. trimethylaluminum) and organic solvent , (e.g. toluene) are fed to a reactor in controlled proportions and under temperature control to form a dilute reaction product mixture of specified composition and concentration. This solution is then processed so as to form at least two product mixtures, one of which is essentially aluminoxane-free hydrocarbylaluminum dissolved in organic solvent and another of which is a , concentrated solution of organoaluminum compounds composed in essence of hydrocarbylaluminum and hydrocarbylaluminoxane in organic solvent in which the amount aluminoxane far exceeds the amount of hydrocarbylaluminum. It is advantageous to …
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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 April 2, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 2, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 2, 2019.
- 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.