Patents by Inventor Ralph S. Hebbert

Ralph S. Hebbert 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).

  • Vehicle sensing device and method
    Patent number: 4975891
    Abstract: A land vehicle sensing device includes a geophone for detecting vibratory gnals and a bandpass amplifier for limiting the electrical output of the geophone to those signals indicative of land vehicles. A real-time frequency analyzer provides a normalized power density spectrum signal which is threshold detected and averaged to provide an indication of land vehicle intrusion.
    Type: Grant
    Filed: February 13, 1970
    Date of Patent: December 4, 1990
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: William C. Wineland, Ralph S. Hebbert, Edward H. Hug