Patents by Inventor John R. Johnston

John R. Johnston 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: 4310922
    Abstract: A bit-sampling multiplexer apparatus includes two terminals, each having a transmitter portion and a receiver portion. A transmitter in one terminal multiplexes data on a plurality of incoming data channels into a serial data frame, and couples this frame across a high-speed digital data communication line to the opposite terminal. The communication line comprises a physical twisted pair cable, optical fiber, or other suitable means for transporting digital data. Two separate lines are provided to enable communication in both directions between said terminals. The transmitter portion of each terminal periodically samples each of a plurality of data channels connected thereto at a rate significantly faster than the bit rate of each such channel, to generate the serial data frame. Each transmitter may also include an edge detector for generating a signal when a state change is detected in one or more high priority data channels.
    Type: Grant
    Filed: January 10, 1980
    Date of Patent: January 12, 1982
    Inventors: W. Wayne Lichtenberger, John R. Johnston
  • Patent number: 4138989
    Abstract: A flat plate solar collector system embodying a plurality of individual conventional solar collector panels in which the frames of said panels are provided with notched portions or recesses for the reception of union type pipe couplings joining the headers of adjacent panels to permit the several panels to be assembled in butted side-by-side or precisely contiguous relation. Additionally, cover plates are provided for the recesses to present a unitary appearance to the assembly.
    Type: Grant
    Filed: February 10, 1977
    Date of Patent: February 13, 1979
    Inventors: George H. Doyle, John R. Johnston
  • Patent number: 3990506
    Abstract: A heat exchanger comprising a novel design, construction and arrangement of readily formable separately sealed channels for the transmission therethrough of fluids to impart heat through conduction and convection from a heated fluid to a fluid to be heated and to be used for heating a work area of a building and the like.
    Type: Grant
    Filed: January 20, 1975
    Date of Patent: November 9, 1976
    Inventors: George H. Doyle, John R. Johnston