Patents by Inventor Robert J. Langston

Robert J. Langston 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).

  • Optical sensing systems
    Patent number: 4653916
    Abstract: A multiplex optical sensing system comprises an optical fibre arranged to be subjected at the longest length to fibre deforming forces during operation of the system and means for producing a plurality of pulse trains of coherent light in which the frequency of frequencies of (F1+.DELTA.F1), (F2+.DELTA.F2), (F3+.DELTA.F3) of the pulses in respective pulse trains lie within a different frequency channel for transmission along said optical fibre.
    Type: Grant
    Filed: December 4, 1985
    Date of Patent: March 31, 1987
    Assignee: Plessey Overseas Limited
    Inventors: Michael L. Henning, Robert J. Langston