Patents by Inventor Anne I. B. Lidgard

Anne I. B. Lidgard 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 fiber for sensors including holes in cladding
    Patent number: 5627921
    Abstract: An optical fiber intended to be used as a sensor is of the kind suitable for communication and has a longitudinal cavity or hole which can be intentionally closed or has a more narrow shape at definite positions in the longitudinal direction of the fiber. The cavity, the diameter of which can be of the magnitude of order of 5 .mu.m-50 .mu.m, is filled with a material changing its volume depending on physical quantities in the fiber environment. The hole can be closed or made narrower at different positions in the longitudinal direction of the fiber for instance by locally heating the fiber by a pulsed laser beam.
    Type: Grant
    Filed: October 14, 1994
    Date of Patent: May 6, 1997
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventors: Anne I. B. Lidgard, Leif G. Stensland, K. A. Mikael berg