Patents by Inventor Henry Takamine

Henry Takamine 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).

  • Patent number: 4713612
    Abstract: A method and apparatus for determining the junction-to-case thermal resistance, .theta..sub.jc, of a solid-state hybrid circuit element 38. First, the temperature coefficient, T.sub.c, of the voltage across the junction is determined with a small calibration current flowing through the junction. Digital multimeters 12 and 28 are used to measure the junction voltage and current, respectively. Next, more power is applied and the total power, P.sub.T, dissipated by the hybrid circuit element 38 is determined from values of the applied voltage and current measured with digital multimeters 12 and 14. The case of the hybrid element is kept at a constant temperature by a heat sink arrangement and the junction is allowed to reach thermal equilibrium at the higher power level. Finally, the increase in power to the hybrid element is removed and the change in junction voltage drop, .DELTA.V.sub.BE, between low-power operation and high-power operation is determined using a storage oscilloscope 30.
    Type: Grant
    Filed: July 14, 1986
    Date of Patent: December 15, 1987
    Assignee: Hughes Aircraft Company
    Inventor: Henry Takamine