Patents by Inventor Lyle N. Trowbridge

Lyle N. Trowbridge 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).

  • Silver recovery
    Patent number: 4131455
    Abstract: Method for recovering pure silver from acid insoluble silver salt contaminated with other metals by first washing the salt with water at a pH less than 3 and then reacting the washed salt with alkali metal borohydride at a pH greater than 12.
    Type: Grant
    Filed: December 9, 1977
    Date of Patent: December 26, 1978
    Assignee: GAF Corporation
    Inventors: Lars T. Edwards, Lyle N. Trowbridge