Patents by Inventor Stanley P. Szpak

Stanley P. Szpak 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).

  • Two-stage anodization of capacitor electrodes
    Patent number: 4131520
    Abstract: In a two-stage anodization process in which the outer portion of a porous valve-metal sintered body is anodized to a higher voltage than the inner portion, the second-stage anodization is carried out in an electrolyte containing a salt of a weak acid.
    Type: Grant
    Filed: November 10, 1977
    Date of Patent: December 26, 1978
    Assignee: Sprague Electric Company
    Inventors: Walter J. Bernard, Stanley P. Szpak