A method for the start-up of an epoxidation process, a catalyst and a process for the epoxidation of an olefin
CA 2490892 C · Owner: Shell Internationale Research Maatschappij B.V. · Inventors: Evans, Wayne Errol
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for the start-up of a process for the epoxidation of an olefin which , method process comprises(a) pre-soaking a silver-based highly selective epoxidation catalyst with an organic halide and (b) passing over the pre-, soaked catalyst a feed which is free of organic halide or which comprises an organic halide at a concentration of at most 2~10-4 mole-% calculated on the , basis of the halogen content relative to the total feed for a period of more , than 16 hours up to 200 hours; a catalyst suitable for the epoxidation of an olefin, which catalyst is obtainable by the said method; anda process for the epoxidation of an olefin, which process comprises the said method and wherein …
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 June 24, 2003 and granted March 20, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 24, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 24, 2025.
- 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.