Patents by Inventor D. Bruce Randolph

D. Bruce Randolph 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).

  • Controlled battery charging system
    Patent number: 5029266
    Abstract: A battery charging system incorporating a unijunction relaxation oscillator circuit and an electronic current limiting control circuit for de-energizing the relaxation oscillator circuit when the battery charging current exceeds a certain minimum value. The system preferably also includes a voltage control circuit and a temperature control circuit all of which are connected in parallel with the electronic current limiting control circuit in order to de-energize the relaxation oscillator circuit when the respective voltage and temperature of the system exceeds certain predetermined minimum values. The electronic current limiting control circuit, the voltage control circuit and the temperature control circuit are included in corresponding solid state integrated circuits.
    Type: Grant
    Filed: January 24, 1990
    Date of Patent: July 2, 1991
    Assignee: Perma-Charger, Inc.
    Inventor: D. Bruce Randolph