Patents by Inventor Graydon C. Hansen

Graydon C. Hansen 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).

  • Rapid battery charger
    Patent number: 6259231
    Abstract: In a method of charging a battery cell, having a positive terminal and a negative terminal, a charging current is applied to the battery cell. A voltage is measured between the positive terminal and the negative terminal. The charging current is removed from the battery cell at a predetermined period subsequent to when the voltage changes at a rate, relative to time, that is not greater than a predetermined threshold. A battery cell charger for charging a battery cell includes a charger circuit, capable of applying a charging current to the battery cell, a voltage sensor circuit that measures a voltage between the positive terminal and the negative terminal and a charger control circuit that is responsive to the voltage sensor.
    Type: Grant
    Filed: November 16, 2000
    Date of Patent: July 10, 2001
    Assignee: R G Technology Ventures, LLC
    Inventor: Graydon C. Hansen