Aluminoxane process
CA 2003993 C · Owner: Ethyl Corporation · Inventors: Bottelberghe, Scott Alan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Hydrocarbylaluminoxanes, especially methylaluminoxane having high catalytic activity in the polymerization of olefins are made in high yield and low gel content by impinging (1) a solution of a hydrocarbyl aluminum e.g. trimethyl aluminum, in an inert solvent e.g. toluene, with (2) a water dispersion in an inert solvent (e.g. toluene) in a T-shaped reactor such that the hydrocarbyl aluminum and water immediately react to form an aluminoxane solution which is promptly removed from the T-shaped reactor through its third arm. The water dispersion is formed by passing a solvent/water mixture through a static mixer which comprises a plurality of deflection vanes forming a tortuous path through …
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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 November 27, 1989 and granted July 20, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 27, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 27, 2011.
- 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.