Patents by Inventor Espiridion G. Valdez

Espiridion G. Valdez 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).

  • Separation of plastics by flotation
    Patent number: 4167477
    Abstract: Individual components of mixtures of plastic materials are separated by flotation employing sodium silicate as a wetting agent and fatty amines as promoters.
    Type: Grant
    Filed: January 17, 1978
    Date of Patent: September 11, 1979
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventors: Espiridion G. Valdez, Wayne J. Wilson