Patents by Inventor David Darrell Unterschultz

David Darrell Unterschultz 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).

  • Method for making security systems more tamper resistant and a security system
    Patent number: 6441733
    Abstract: A method for making a security system more tamper resistant involving the step of monitoring an electric reference characteristic in a detection circuit of a security system and generating random periodic changes to the electrical reference characteristic in order to detect any tampering with the electric reference characteristic in the detection circuit.
    Type: Grant
    Filed: June 16, 2000
    Date of Patent: August 27, 2002
    Inventor: David Darrell Unterschultz