Patents by Inventor Robert D. Sturdevant

Robert D. Sturdevant 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).

  • Strontium-bearing master composition for addition to eutectic and hypo-eutectic silicon-aluminum casting alloys
    Patent number: 4108646
    Abstract: A master composition for modifying the eutectic component of eutectic and hypo-eutectic silicon-aluminum casting alloys comprises an intimate admixture, in powder or compact form, of a) particles of strontium-silicon and, in certain case, b) particles of an aluminous material, e.g., aluminum. The modification of the silicon-aluminum casting alloys is achieved by adding to the alloy while the alloy is in molten form an effective amount of the master composition, e.g., such as to introduce between about 0.005 and 0.4 percent by weight of strontium into said alloy.
    Type: Grant
    Filed: January 28, 1977
    Date of Patent: August 22, 1978
    Assignee: Kawecki Berylco Industries, Inc.
    Inventors: Richard J. Gennone, Robert D. Sturdevant