Process for producing vanadium-arenes
CA 2033799 C · Owner: Moalli, Angelo · Inventors: Pampaloni, Guido; Invernizzi, Renzo; Calderazzo, Fausto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Vanadium-arenas, V(arene)2, wherein "arene" means benzene or monodi- or poly-(C1-, C5)-alkyl-substituted benzene are prepared by means of a , process which comprises: (a) forming a complex:, V(arene)2(+) ~ AlCl4(-) by reacting vanadium trichloride, aluminum metal and aluminum trichloride with one another, by operating in the presence of the selected arene; (b) treating the so obtained complex with an either cyclic or acyclic, liquid aliphatic ether to obtain the reduction of V(arene)2(+) to V(arene)2; and (c) recovering the so separated vanadium-arene. The vanadium-arenes are useful in the preparation of catalysts for olefin polymerization.
Read the whole patent
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 January 8, 1991 and granted July 3, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 8, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 8, 2013.
- 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.