Patents by Inventor Sandra L. Madden

Sandra L. Madden 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).

  • Quartz lamp envelope with molybdenum foil having oxidation-resistant surface formed by ion implantation
    Patent number: 5021711
    Abstract: A quartz lamp envelope includes a press seal, at least one molybdenum foil feedthrough extending through the press seal to the lamp interior, and an external electrical lead connected to the molybdenum foil. The molybdenum foil has an oxidation-inhibiting material, such as chromium, aluminum and combinations thereof, embedded in a surface layer thereof by ion implantation. The electrical lead has an oxidation-inhibiting coating, such as silicon carbide, silicon nitride and combinations thereof, formed by plasma-enhanced chemical vapor deposition. Alternatively, the electrical lead can have an oxidation-inhibiting material embedded in a surface layer thereof by ion implantation.
    Type: Grant
    Filed: October 29, 1990
    Date of Patent: June 4, 1991
    Assignee: GTE Products Corporation
    Inventors: Sandra L. Madden, Mark D. Beschle, Roy C. Martin