Molybdenum recovery
CA 2094898 A1 · Owner: Texaco Chemical Inc. · Inventors: Payton, Howard Franklin; Marquis, Edward Thomas; Meyer, Robert Allen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for recovery of molybdenum from residual fractions derived from an epoxidation reaction of propylene with tertiary butyl hydroperoxide in liquid phase with tertiary butyl alcohol, in the presence of soluble molybdenum which process comprises:, Fractionating epoxidation reaction product for obtaining a liquid fraction containing essentially all molybdenum from the reaction product; Contacting the liquid fraction with anhydrous ammonia for forming a precipitate containing the major portion of the molybdenum and a liquid phase containing 500 ppm or less molybdenum;, Separating the liquid phase from the precipitated solid; Evaporating the liquid phase under conditions of elevated …
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 April 26, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 26, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 26, 2015.
- 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.