Catalyst recovery process
CA 2052199 A1 · Owner: Heaton, Philip · Inventors: Ashton, David J.; Heaton, Philip; Gelsthorpe, Michael R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Case 7679(2), ABSTRACT OF THE DISCLOSURE Catalyst Recovery Process, A process for converting a solid catalyst comprising ruthenium and cerium into an aqueous solution suitable for use in repreparing the solid catalyst which process comprises the steps of: (a) dissolving the solid catalyst in an effective amount of concentrated hydrochloric or hydrobromic acid (b) treating the product of step (a) with an effective amount of concentrated nitric acid, (c) heating the product of step (b) until substantially all hydrogen chloride or hydrogen bromide is removed (d) diluting the product of step (c) with water.
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 September 26, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 26, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 26, 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.