Patents by Inventor Robert S. F. Chang

Robert S. F. Chang 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).

  • Growing crystalline sapphire fibers by laser heated pedestal techiques
    Patent number: 5607506
    Abstract: An improved system and process for growing crystal fibers comprising a means for creating a laser beam having a substantially constant intensity profile through its cross sectional area, means for directing the laser beam at a portion of solid feed material located within a fiber growth chamber to form molten feed material, means to support a seed fiber above the molten feed material, means to translate the seed fiber towards and away from the molten feed material so that the seed fiber can make contact with the molten feed material, fuse to the molten feed material and then be withdrawn away from the molten feed material whereby the molten feed material is drawn off in the form of a crystal fiber.
    Type: Grant
    Filed: October 21, 1994
    Date of Patent: March 4, 1997
    Assignee: University of South Florida
    Inventors: Vongvilay Phomsakha, Robert S. F. Chang, Nicholas I. Djeu