Patents by Inventor Fred W. Wise

Fred W. Wise 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).

  • Current and voltage limited inverter
    Patent number: 4719556
    Abstract: An electronic inverter with sharply limited output voltage and current despite wide variations in load impedance. A particular configuration of passive reactances on the output of a conventional semiconductor inverter assures that voltage is limited with varying impedance loads which might otherwise increase the output voltage, and it also guarantees that even a short circuited load will not exceed the current limitation of the circuit.
    Type: Grant
    Filed: August 7, 1986
    Date of Patent: January 12, 1988
    Assignee: Armstrong World Industries, Inc.
    Inventor: Fred W. Wise
  • Altimeter and vertical speed indicator
    Patent number: 4539843
    Abstract: A combination altimeter and vertical speed indicator using digital displays. Digital logic technique are used to calculate vertical speed, eliminate drift in the vertical speed zero indication, correct vertical speed readings for altitude, and display altitude below zero. An automatic reading of barometric pressure setting for use as an offset is furnished at turn-on to permit initial setting of the instrument. Power to the instrument is pulsed to reduce consumption and permit long term battery operation.
    Type: Grant
    Filed: December 5, 1983
    Date of Patent: September 10, 1985
    Assignee: Aerologic, Inc.
    Inventor: Fred W. Wise