Patents by Inventor Hyman Leggett, deceased

Hyman Leggett, deceased 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).

  • Graphite fiber reinforced silica matrix composite
    Patent number: 4791076
    Abstract: A graphite fiber reinforced silica matrix composite comprising a plurality of graphite fibers bonded together in a silica matrix comprised of silica, boron phosphate and beta-spodumene modified with a minor amount of an alkaline earth metal oxide is disclosed. The extremely low, nearly zero, coefficient of thermal expansion coupled with the moderate thermal conductivity and low density of the composite make the composite particularly suitable as a substrate material for high energy laser mirrors.
    Type: Grant
    Filed: August 2, 1984
    Date of Patent: December 13, 1988
    Assignee: Hughes Aircraft Company
    Inventors: Hyman Leggett, deceased, Kenneth M. Brown