Patents by Inventor Daniel J. Theobald

Daniel J. Theobald 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).

  • Fast battery charging method and apparatus with temperature gradient detection
    Patent number: 5519303
    Abstract: A control circuit and method of operating a battery charging system are provided capable of disabling charging of a rechargeable battery (320) based upon a second derivative (410) of a temperature of the battery. A thermistor (330), contained in a rechargeable battery pack together with the rechargeable battery (320), detects the temperature of the battery. Charging of the battery can be disabled when the second derivative (410) of the temperature of the battery is positive and the first derivative (390) of the temperature of the battery is higher than a predetermined threshold.
    Type: Grant
    Filed: September 30, 1993
    Date of Patent: May 21, 1996
    Assignee: Motorola, Inc.
    Inventors: Terrance J. Goedken, Daniel J. Theobald