Patents by Inventor Wayne D. Hamby

Wayne D. Hamby 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).

  • Patent number: 4083758
    Abstract: Copper values are recovered in metallic form from a solution containing such values along with chloride ions by, first, selectively removing the chloride ions from the solution, and then electrowinning the copper from the chloride-free solution. The process is particularly useful in recovering copper values from etching solutions in a metallic form, such as "wire-grade" metallic copper, that is available for fabrication into commercial copper products. The process is preferably applied to ammoniacal etching solutions derived from the manufacture of printed electronic circuit boards. As so applied, the chlorides are selectively removed by liquid-liquid extraction procedures, resulting in a substantially chloride-free, acidic stripping solution containing the copper values, which solution is subjected to electrolysis for winning copper metal.
    Type: Grant
    Filed: September 27, 1976
    Date of Patent: April 11, 1978
    Assignee: Criterion
    Inventors: Wayne D. Hamby, Marvin Dale Slade