Patents by Inventor Robert S. Ringland

Robert S. Ringland 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).

  • Band pass amplifier
    Patent number: 4028629
    Abstract: A frequency band pass circuit having an amplifier that has an amplifying state and may be selectively deenergized to a non-amplifying state. A reverse bias is placed on the amplifier when in the deenergized state to provide substantially the same band pass characteristics of the circuit in the non-amplifying state as in the amplifying state and to reduce the insertion loss impedance through the amplifier in the non-amplifying state.
    Type: Grant
    Filed: April 26, 1976
    Date of Patent: June 7, 1977
    Assignee: Tandy Corporation
    Inventor: Robert S. Ringland
  • Frequency modulated signal pre-amplifier with amplitude modulated signal bypass
    Patent number: 3965426
    Abstract: For use with radio receivers adapted to receive both frequency and amplitude modulated signals, a frequency modulated signal preamplifier adapted to be serially connected between the antenna input lead and antenna connector of such a radio, the pre-amplifier including means for separating the amplitude modulated and frequency modulated signals, amplifying the frequency modulated signals, and recombining the signals for input at the antenna input terminal of the receiver.
    Type: Grant
    Filed: January 10, 1974
    Date of Patent: June 22, 1976
    Assignee: Tandy Corporation
    Inventor: Robert S. Ringland