Patents by Inventor Hector O. McDonald

Hector O. McDonald 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).

  • Recovery of chromium from waste solutions
    Patent number: 4337227
    Abstract: Chromium is selectively precipitated from waste solutions by means of benzoate ion. The resulting chromium benzoate complex is separated, washed and treated with either base or sulfuric acid to recover the benzoate and a chromium hydroxide product.
    Type: Grant
    Filed: September 10, 1981
    Date of Patent: June 29, 1982
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventors: Hector O. McDonald, Lawrence C. George
  • Copper electrowinning and Cr.sup.+6 reduction in spent etchants using porous fixed bed coke electrodes
    Patent number: 4256557
    Abstract: Exhausted Cr.sup.+6 oxidizing solutions containing Cu.sup.+2 values are electrolyzed by placing an exhausted Cr.sup.+6 etching or oxidizing solution containing copper ion and Cr.sup.+3 ions in an electrolytic cell containing at least one pair of carbon particle electrodes, and forcefully flowing the exhausted solution through the electrodes and simultaneously impressing a direct current across the electrodes such that at the cathode divalent copper is reduced to copper metal and Cr.sup.+6 values are reduced to trivalent chromium and at the anode water is oxidized to oxygen.
    Type: Grant
    Filed: October 16, 1979
    Date of Patent: March 17, 1981
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventors: David M. Soboroff, Hector O. McDonald