Patents by Inventor Zoenek Hofirek

Zoenek Hofirek has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for removing dissolved selenium values from an acidic aqueous copper sulphate solution
    Patent number: 4377556
    Abstract: Dissolved selenium values are removed from an acidic aqueous copper sulphate solution by treating the solution at a temperature of at least about 140.degree. C. with a stoichiometric excess relative to the dissolved selenium of sulphur dioxide or a sulphite solution to produce a selenium-containing precipitate and dissolved cuprous copper. The temperature of the treated solution is maintained at at least about 140.degree. C. and an oxygen containing gas is passed into the treated solution under a pressure of at least about 350 kPa to oxidize dissolved cuprous copper to dissolved cupric copper.
    Type: Grant
    Filed: April 9, 1982
    Date of Patent: March 22, 1983
    Assignee: Sherritt Gordon Mines Limited
    Inventor: Zoenek Hofirek