Vanadium recovery process
CA 1293380 C · Owner: Jansz, Just Jan Christiaan · Inventors: Jansz, Just Jan Christiaan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of pentavalent vanadium compounds from acid extracts obtained by regenerating spent catalysts which contain vanadium, this process comprising the successive steps of 1) oxidizing extracts containing tri- and tetravalent vanadium with an oxygen-containing gas at a pH of at least 0.7 - 1.4 P and at most 2.3 - 1.4 P to form a solution of tetravalent vanadium compounds, and 2) continuing the oxidation at a pH lying in the range of from 3.2 - 1.4 P to 2.3 - 1.4 P to form concentrates of pentavalent vanadium in, which P stands for the partial oxygen pressure in MPa.
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
- Granted December 24, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 24, 2008.
- 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.