Patents by Inventor Joel J. Walukas

Joel J. Walukas 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).

  • Radio communications devices with backlighting circuits having brownout detection circuits responsive to a current through a light emitting diode
    Patent number: 6256007
    Abstract: A backlighting circuit for user interface in an electronic device includes at least one light emitting diode optically coupled to the user interface wherein the at least one light emitting diode provides backlighting for the user interface. A current source is electrically coupled in series with the at least one light emitting diode wherein the current source controls a current through the at least one diode. In addition, a brownout detection circuit determines a brownout condition for the user interface responsive to the current through the diode. Related communications devices and methods are also discussed.
    Type: Grant
    Filed: May 11, 2000
    Date of Patent: July 3, 2001
    Assignee: Ericsson Inc.
    Inventors: Joel J. Walukas, John W. Northcutt
  • Backlighting circuits including brownout detection circuits responsive to a current through at least one light emitting diode and related methods
    Patent number: 6107985
    Abstract: A backlighting circuit for user interface in an electronic device includes at least one light emitting diode optically coupled to the user interface wherein the at least one light emitting diode provides backlighting for the user interface. A current source is electrically coupled in series with the at least one light emitting diode wherein the current source controls a current through the at least one diode. In addition, a brownout detection circuit determines a brownout condition for the user interface responsive to the current through the diode. Related communications devices and methods are also discussed.
    Type: Grant
    Filed: October 30, 1997
    Date of Patent: August 22, 2000
    Assignee: Ericsson Inc.
    Inventors: Joel J. Walukas, John W. Northcutt