Patents by Inventor Dean Michael Umberger

Dean Michael Umberger 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).

  • Voltage sensing current foldback switch circuit
    Patent number: 6169425
    Abstract: The present invention is directed to an integrated circuit comprising a voltage source and a voltage sensing circuit having a switch circuit for sensing a switch voltage and a switch current; a voltage comparison circuit connected to the switch circuit for comparing the switch voltage to a limiting voltage; and a current limiting circuit connected to the switch circuit and the voltage comparison circuit, which is capable of limiting the switch current when the switch voltage reaches or exceeds the limiting voltage. In a preferred embodiment of the invention the switch circuit is a bi-directional switch circuit and the voltage comparison circuit incorporates a series of Zener diodes, wherein the current limiting circuit is a current foldback circuit.
    Type: Grant
    Filed: September 29, 1998
    Date of Patent: January 2, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Dewayne Alan Spires, Dean Michael Umberger