Polymethylaluminoxane of enhanced solution stability
CA 2091741 C · Owner: Malpass, Dennis B. · Inventors: Malpass, Dennis B.; Deavenport, Dennis L.; Rabbitt, Constance S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polymethylaluminoxane compositions having increased solution stability in organic solvent and in some cases, increased polymerization activity which comprise moieties, derived from an organic compound containing an electronrich heteroatom (e.g. from Group V and/or Group VI of the Periodic, Table) and a hydrocarbyl moiety. These compositions can be formed by reaction of trimethylaluminum, the organic compound and water. They, can also be formed by ruction of pre-formed polymethylaluminoxane the organic compound which can be a, hydrocarbyl group-containing compound containing an electron-rich heteroatom (e.g. oxygen, nitrogen or, sulfur), either-with or without an active hydrogen atom …
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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 16, 1993 and granted October 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 16, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 16, 2015.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.