Patents by Inventor Andrew J. Smallridge

Andrew J. Smallridge 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).

  • Erasable/rewritable optical data storage with photorefractive polymers
    Patent number: 6867408
    Abstract: A method of erasable/rewritable optical data storage is provided in which a laser beam from a laser (10) operated in either a pulsed or continuous wave mode is focussed by an optical system (11-18) onto a photorefractive polymeric material (32) to cause two photon excitation of the material to record data which may subsequently be erased by illuminating the material with radiation having a wavelength in the ultraviolet or visible spectrum to erase the recorded data. New photorefractive polymeric materials having a relatively narrow absorption band for use in the method are also disclosed.
    Type: Grant
    Filed: February 16, 2000
    Date of Patent: March 15, 2005
    Assignee: Victoria University of Technology
    Inventors: Min Gu, Daniel J Day, Andrew J. Smallridge