Patents by Inventor Robert L. Petrusha

Robert L. Petrusha 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).

  • Low temperature solid state bonding of tungsten to other metallic materials
    Patent number: 6324985
    Abstract: A penetrator and method of making same are disclosed. The penetrator includes a tungsten ballast and a steel casing having a bore sized to fit the tungsten ballast therein. Copper and silver coatings are provided on mating surfaces of the tungsten ballast and the steel casing. The tungsten ballast is fitted within the bore of the steel casing to form an assembly, and the assembly is pressurized at a pressure and temperature sufficient to form a low temperature solid state diffusion bond between the tungsten ballast and the steel casing. The bond temperature is below the final tempering temperature of the steel casing and the melting temperatures of the silver and copper. This process allows bonds to be produced on steels in their fully heat treated condition.
    Type: Grant
    Filed: September 8, 1999
    Date of Patent: December 4, 2001
    Assignee: Lockheed Martin Corporation
    Inventor: Robert L. Petrusha