Patents by Inventor Grace L. Gorman

Grace L. Gorman 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 to produce stress-free optical waveguides to reduce stress-induced birefringence in planar lightwave circuit (PLC) devices
    Patent number: 6885803
    Abstract: A method of forming a waveguide comprising the following steps. A structure is provided. An underclad layer is formed over the structure and a core layer is formed over the underclad layer. Patterning: the core layer to form the waveguide; and partially into the underclad layer, forming an overetched underclad layer having a projection underneath the waveguide. The waveguide having stress gradients and the overetched underclad layer having stress gradients.
    Type: Grant
    Filed: July 14, 2003
    Date of Patent: April 26, 2005
    Assignee: Headway Technologies, Inc.
    Inventors: Devendra S. Chhabra, Grace L. Gorman
  • Process for optically storing information using materials having a single phase in both the crystalline state and the amorphous state
    Patent number: 4787077
    Abstract: An optical storage system has an information containing film of a material which has a crystallization temperature between 100.degree. C. and 400.degree. C. and can be switched between the amorphous and the crystalline states. Both the amorphous and crystalline states are substantially a single phase where the stoichiometric ratio of the material remains unchanged. Spots on the film is heated with a circular laser beam with a controlled pulse duration and intensity to melt the material in the spots. The spots are quenched at one rate to produce the amorphous state, and in a second revolution of the disk, at a different rate to produce the crystalline state.
    Type: Grant
    Filed: August 28, 1987
    Date of Patent: November 22, 1988
    Assignee: International Business Machines Corporation
    Inventors: Roger W. Barton, Martin Y. Chen, Charles R. Davis, Grace L. Gorman, Vincent Marrello, Kurt A. Rubin