Patents by Inventor Barry John Keon

Barry John Keon 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).

  • Method and apparatus for inducing a temporary localized transmission loss in a telecommunications cable
    Patent number: 5673351
    Abstract: A method and apparatus for inducing a localised optical transmission loss in an optical fiber cable is described, which is particularly well suited for use with optical time-domain reflectometry (OTDR) equipment to aid in locating faults in an optical fiber cable. A small portion of the optical fiber cable is cooled, such as by immersion in a cryogenic liquid like liquid nitrogen, and fibres in the cooled cable portion exhibit localised optical transmission loss which can be detected as a point loss (26) with the OTDR trace (24). The technique of inducing the point loss is non-invasive, and the localised transmission loss disappears when the cable portion returns to the ambient temperature, without damage to the cable.
    Type: Grant
    Filed: November 15, 1995
    Date of Patent: September 30, 1997
    Assignee: Telstra Corporation Limited
    Inventors: Kenneth Paul Clarke, David Coulson, Ernest Edward Gibbs, Barry John Keon, Alfred Willem Kruijshoop