Patents by Inventor Douglas W. Nickerson

Douglas W. Nickerson 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).

  • Power supply circuitry
    Patent number: 4155112
    Abstract: A power supply circuitry including an input DC voltage source, a DC to DC up converter for converting the input DC voltage to an output DC voltage of greater magnitude and means for enabling the up converter to change the magnitude of the output DC voltage. The output voltage is further smoothed and filtered by a DC to DC series regulator.
    Type: Grant
    Filed: June 6, 1977
    Date of Patent: May 15, 1979
    Assignee: Motorola, Inc.
    Inventors: James A. Miller, Douglas W. Nickerson
  • "Wild" mobile disable circuit
    Patent number: 3936616
    Abstract: A circuit for disabling, or shutting down, the transmitter of a mobile telephone unit when the unit is not connected to another party is disclosed. When such a "wild" mobile is sensed, a sequence of idle and seize audio tones are sent and transitions therebetween are counted. When a specific number of counts are counted a disable signal is developed. The counter is continually reset and does not count when the handset is on hook. When the handset is off hook and the mobile is talking to a party voice falsing of the counter is prevented by a timer circuit.
    Type: Grant
    Filed: September 23, 1974
    Date of Patent: February 3, 1976
    Assignee: Motorola, Inc.
    Inventors: Dominic J. DiGianfilippo, Douglas W. Nickerson