Patents Represented by Attorney Charles W. Hoffmann
  • Patent number: 3930849
    Abstract: Ag-CdO type material suitable for use as an electrical contact material in a switching device such as a circuit breaking device is disclosed. The material contains Ag and CdO with an oxide of Sn and an oxide of an additive metal selected from Mg, Ca, or mixtures of oxides of such additive metals. The additive metal appears to form an oxide of the metal earlier during oxidation of the material than either the Sn or Cd thereby acting as a nucleating site for the formation of the oxides of the Sn and Cd. The oxide of the metals appears to tend to grow as a mixture of the oxides of the additive metal, Cd and Sn. This material has good high temperature properties, undergoes oxidation of the oxidizable constituents at a high rate and has a fine oxide particle size.The method of making the Ag-CdO type material.
    Type: Grant
    Filed: May 24, 1973
    Date of Patent: January 6, 1976
    Assignee: P. R. Mallory & Co., Inc.
    Inventors: Richard H. Krock, Yuan-Shou Shen
  • Patent number: 3930885
    Abstract: A reserve cell is described for providing electrochemical energy and which is capable of long shelf life in the reserve state. This cell comprises a combined prismatic electrode chamber overlayed with a compartment containing the electrolyte. The electrolyte is prevented from access to the electrode chamber, by a frangible sealing means. The reserve cell is designed to be rapidly actuated by a separable actuator means of which the reserve cell actuator means described in U.S. Pat. No. 3,484,297 is preferred. The electrolyte compartment is completely lined with an electrolyte impermeable lining forming the electrolyte container which is collapsible. Upon actuation the applied pressure forcibly expels the electrolyte from the electrolyte container into the electrode chamber.
    Type: Grant
    Filed: January 11, 1973
    Date of Patent: January 6, 1976
    Assignee: P. R. Mallory & Co., Inc.
    Inventor: Arabinda N. Dey
  • Patent number: 3931552
    Abstract: Chromate radicals are used in a capacitor electrolyte comprising a polar organic solvent containing an ionizable salt in order to improve the elevated temperature properties, shelf life and storage life of electrolytic capacitors.
    Type: Grant
    Filed: April 21, 1971
    Date of Patent: January 6, 1976
    Assignee: P. R. Mallory & Co., Inc.
    Inventors: Daniel J. Anderson, James C. Jimerson