Patents by Inventor Dennis G. McFayden

Dennis G. McFayden 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: 4301415
    Abstract: A variable frequency oscillator for an AC power supply having programmable, multiple phase outputs comprises means including a rate multiplier for generating a clock signal having a selectively controllable frequency and one or more AC signal producing stages responsive thereto. Each AC signal producing stage includes a memory storing a quarter-cycle sinusoidal waveform segment in amplitude sampled form and an address counter responsive to the clock signal for alternately addressing the memory in forward and reverse directions for producing a continuous sequence of half-cycle sinusoidal segments, an output circuit inverting every other one of the half-cycle segments.
    Type: Grant
    Filed: January 28, 1980
    Date of Patent: November 17, 1981
    Assignee: Norlin Industries, Inc.
    Inventor: Dennis G. McFayden
  • Patent number: 4160949
    Abstract: An auto-zeroed ohmmeter is comprised of a current source having first and second leads for connection to respective terminals of an unknown resistor to generate first and second voltages at the terminals. A sensing circuit having third and fourth leads connects to the terminals of the unknown resistor and scales the first and second voltages to third and fourth voltages respectively. A ramp generator circuit is coupled to the sensing circuit and generates a ramp voltage with a slope proportional to the difference between the fourth voltage and a multiple of the third voltage. This ramp is generated for a time period of predetermined duration to thereby produce a reference point voltage at the end of the time period.
    Type: Grant
    Filed: March 6, 1978
    Date of Patent: July 10, 1979
    Assignee: California Instruments Corporation
    Inventor: Dennis G. McFayden