Patents by Inventor M. Dennis Petry

M. Dennis Petry 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).

  • Zircon-carbon for ceramic composite fiber coatings and fine-grained zircon powder
    Patent number: 6221942
    Abstract: A carbon-rich zirconia-silica sol is prepared by the steps of dissolving zirconyl nitrate hydrate in absolute ethanol, mixing the solution thus obtained with a silicon alkoxide, and mixing the latter solution with a polyelectrolyte. The resulting carbon-rich sol/polyelectrolyte mixture can be employed to coat continuous fiber tow or filaments, to make nanosized zircon powder and to make a porous zircon membrane material.
    Type: Grant
    Filed: August 23, 1999
    Date of Patent: April 24, 2001
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Emmanuel E. Boakye, Randall S. Hay, Triplicane A. Parthasarathy, M. Dennis Petry
  • Ceramic composite
    Patent number: 5759632
    Abstract: An improved method for producing a fiber-reinforced ceramic composite having a monazite interface between the reinforcing fiber and the ceramic matrix, which comprises the steps of coating each filament in a continuous fiber tow with an aqueous sol that forms monazite after high temperature heat treatment, heat treating the thus-coated fiber tow to provide a coated tow having a layer of monazite thereon, embedding the fiber in a suitable ceramic matrix, and densifying the composite.
    Type: Grant
    Filed: April 14, 1997
    Date of Patent: June 2, 1998
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Emmanuel E. Boakye, M. Dennis Petry, Randall S. Hay