Patents by Inventor M. Dale Alexander

M. Dale Alexander 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).

  • Composition for extraction of metal ions and oxanions
    Patent number: 4992207
    Abstract: The present invention relates to a method for the selective extraction of the metals gold, silver, platinum or mercury ions or colloidal gold, from an aqueous solution containing at least one of these metal ions which comprises contacting the solution, at a pH of 2 or less, with cells or cell extracts of a microorganism capable of binding these metals for a period of time and under conditions sufficient to allow binding of the metals to the cells or cell extracts.
    Type: Grant
    Filed: August 5, 1985
    Date of Patent: February 12, 1991
    Assignee: Bio-Recovery Systems, Inc.
    Inventors: Dennis W. Darnall, M. Dale Alexander, Michael Henzl, Benjamin Greene, Michael Hosea, Robert A. McPherson