Patents by Inventor Gerald D. Mahan

Gerald D. Mahan 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).

  • Rare earth doped zinc oxide varistors
    Patent number: 5854586
    Abstract: A varistor includes a Bi-free, essentially homogeneous sintered body of a ceramic composition including, expressed as nominal weight %, 0.2-4.0% oxide of at least one rare earth element, 0.5-4.0% Co.sub.3 O.sub.4, 0.05-0.4% K.sub.2 O, 0.05-0.2% Cr.sub.2 O.sub.3, 0-0.2% CaO, 0.00005-0.01% Al.sub.2 O.sub.3, 0-2% MnO, 0-0.05% MgO, 0-0.5% TiO.sub.3, 0-0.2% SnO.sub.2, 0-0.02% B.sub.2 O.sub.3, balance ZnO.
    Type: Grant
    Filed: September 17, 1997
    Date of Patent: December 29, 1998
    Assignee: Lockheed Martin Energy Research Corporation
    Inventors: April D. McMillan, Frank A. Modine, Robert J. Lauf, Mohammad A. Alim, Gerald D. Mahan, Miroslaw Bartkowiak