Patents by Inventor David Arthur Sauer

David Arthur Sauer 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).

  • Patent number: 4122415
    Abstract: An AM transmitter of the type including apparatus for generating a subcarrier signal, pulse width modulating this subcarrier with audio, amplifying this resulting pulse width signal using active devices operating in the more efficient switching mode is disclosed. The amplified pulse width signal is passed through a low pass filter wherein the audio is recovered and used to amplitude modulate a radio frequency stage. The improvement herein includes a means for providing an offset voltage to the RF stage so that the system will develop zero carrier output when the pulse width of the modulating signal to the active devices has a relatively small finite value.
    Type: Grant
    Filed: December 9, 1977
    Date of Patent: October 24, 1978
    Assignee: RCA Corporation
    Inventors: Arch Clinton Luther, Jr., David Arthur Sauer