Patents by Inventor Gale L. Leach

Gale L. Leach 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 gold from bromide etchants
    Patent number: 4375984
    Abstract: Gold, as well as other metals such as copper, titanium, and nickel, are etched from substrates by alkali metal iodide and bromide solutions also containing iodine and bromine, respectively. The dissolved gold is recovered as metallic gold either by precipitating it using an alkali metal hydroxide or by a decomposition technique in which the etchant solution is driven off. A method is also taught to regenerate alkali metal iodide-iodine etchant solution.
    Type: Grant
    Filed: August 14, 1980
    Date of Patent: March 8, 1983
    Inventors: Surinder K. Bahl, Gale L. Leach
  • Gold etchant composition and method
    Patent number: 4190489
    Abstract: A composition and method for etching gold, particularly gold layers on ceramic substrates, in which the gold is contacted at room temperature by an aqueous solution of alkali metal bromide and bromine. The composition is relatively safe and easy to handle and rapidly etches gold.
    Type: Grant
    Filed: September 21, 1978
    Date of Patent: February 26, 1980
    Assignee: The Mead Corporation
    Inventors: Surinder K. Bahl, Gale L. Leach