Patents by Inventor David R. Bitzer

David R. Bitzer 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).

  • Secret-signalling system utilizing noise communication
    Patent number: 4179658
    Abstract: A secret-signaling, transmitted-reference, spread-spectrum system, utiliz a suppressed-noise carrier for the information signal in combination with a delayed-noise, suppressed carrier of a fixed frequency in order to spectrum-spread the voice signal across the noise signal in the same frequency band. The receiver of the system delays the transmitted signal input which is taken together with the undelayed transmitted signal to determine correlation in order to extract, from the transmitted spread-spectrum signal, solely the information signal generated.
    Type: Grant
    Filed: August 23, 1968
    Date of Patent: December 18, 1979
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: David R. Bitzer