Patents by Inventor Bill J. Ransdell

Bill J. Ransdell 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).

  • Intrusion detection system
    Patent number: 4991146
    Abstract: A microprocessor-based ultrasonic intrusion detection system includes an initialization mode wherein a plurality of echoes are cumulatively processed to produce a reference or signature data set representing the area to be monitored without intruding objects. Later received echoes are compared to this signature so that an intruding object will cause generation of an alarm signal. Time varying thresholds are utilized to compensate for attenuation caused by increased distance.
    Type: Grant
    Filed: November 30, 1989
    Date of Patent: February 5, 1991
    Assignee: Deere & Company
    Inventors: Bill J. Ransdell, James J. Phelan