Patents by Inventor Brent F. Balch

Brent F. Balch 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).

  • Electronic article surveillance system employing time domain and/or frequency domain analysis and computerized operation
    Patent number: 4859991
    Abstract: A magnetic article surveillance system utilizing microcomputer control and unique time domain and frequency domain information gathering channels whose information is processed by the microcomputer via preselected time domain and frequency domain criteria.
    Type: Grant
    Filed: August 28, 1987
    Date of Patent: August 22, 1989
    Assignee: Sensormatic Electronics Corporation
    Inventors: Harry E. Watkins, Brent F. Balch, Jeffery T. Oakes, Richard L. Copeland, Hubert A. Patterson, Mart Martinson