Patents by Inventor Randall B. Lloyd

Randall B. Lloyd 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: 4823028
    Abstract: A multilevel logic circuit includes a pair of resistors coupling collectors of an emitter-coupled pair of transistors to a voltage source, and includes a switch selectively connecting the emitters of the transistors to a current source. When the switch is closed, an input signal applied across the bases of the transistors controls an output signal produced between their collectors. When the switch is open, both transistors are off and the output signal is not affected by the input signal. A clamping circuit connected to a circuit node at the emitters of the transistors maintains a constant voltage at the node sufficient to prevent leakage current from charging or discharging inherent circuit capacitance at the node when the switch is open.
    Type: Grant
    Filed: December 4, 1987
    Date of Patent: April 18, 1989
    Assignee: Tektronix, Inc.
    Inventor: Randall B. Lloyd