Patents by Inventor Edward J. Markland

Edward J. Markland 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).

  • AC Etching of aluminum capacitor foil
    Patent number: 4332651
    Abstract: Aluminum capacitor foil is etched in a bath at 30.degree. to 45.degree. C. containing 0.5 to 1.8 M hydrochloric acid, 0.05 to 0.3 M phosphoric acid, 0.2 to 0.5 aluminum chloride and 0.09 to 1.0 M alkali or alkaline earth metal chloride while being subjected to alternating current at 15 to 36 Hz frequency.
    Type: Grant
    Filed: May 20, 1981
    Date of Patent: June 1, 1982
    Assignee: Sprague Electric Company
    Inventors: Richard A. Bemis, Clinton E. Hutchins, Edward J. Markland, Mulk R. Arora