Process for the recovery of catalyst values
CA 2007730 C · Owner: Tennant, Brent Alan · Inventors: Cook, Steven Leroy; Tennant, Brent Alan; Odom, Steve Conley
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is an improved process for the recovery of rhodium catalyst values from "tars" n formed during the preparation of acetic anhydride by the rhodium-catalyzed carbonylation of a mixture of methyl iodide and methyl acetate. The process entails an extraction process wherein rhodium-containing tar is extracted using a combination of aqueous hydrogen iodide methyl iodide, and elemental iodine to recover 95 weight percent or greater of the rhodium in the aqueous phase.
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 15, 1990 and granted February 6, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 15, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 15, 2012.
- 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.