Catalytic trimerization of olefinic monomers
CA 2541697 C · Owner: Drent, Eit · Inventors: Ernst, Rene; Drent, Eit
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A catalyst composition suitable for the trimerization of olefinic monomers wherein the catalyst composition comprises: a) a source of chromium molybdenum or tungsten; b) a ligand of general formula (I); (R1) (R2) P-X-P (R3) (R4) wherein: X is a bivalent organic bridging group; R1and R3 are independently selected from, hydrocarbyl substituted hydrocarbyl, heterohydrocarbyl and substituted heterohydrocarbyl groups with the proviso , that when Rl and R3 are cycloaromatic groups they do not contain a polar substituent at any of the ortho-positions; R2 and R4 are independently selected from optionally substituted cycloaromatic groups each R2 and R4 , bearing a polar substituent on at least …
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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 October 7, 2004 and granted December 10, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 7, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 7, 2026.
- 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
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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.