Patents by Inventor Dave Roberson

Dave Roberson 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).

  • Transmitter for pulsed electronic article surveillance systems
    Patent number: 5640693
    Abstract: An electronic article surveillance (EAS) system includes a pulsed EAS transmitter, a linear power amplifier having active devices for linear amplification of signals input thereto and a controller for energizing the linear power amplifier active devices correspondingly with transmitter pulsations. A transmitter for use in electronic article surveillance, comprises a transmitting antenna, a source providing a succession of mutually spaced bursts of high-frequency signals, a linear power amplifier having active devices for linear amplification of the succession of mutually spaced bursts of high-frequency signals and a controller for selectively energizing the linear power amplifier active devices. The controller maintains the linear power amplifier active devices unenergized between successive of the mutually spaced bursts of high-frequency signals.
    Type: Grant
    Filed: August 30, 1994
    Date of Patent: June 17, 1997
    Assignee: Sensormatic Electronics Corporation
    Inventors: Brent Balch, Steve Embling, Dave Roberson