Patents by Inventor Henry L. Andrews

Henry L. Andrews 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).

  • Cobalt-chromium superalloy
    Patent number: 4631082
    Abstract: An oxide dispersion strengthened cobalt-chromium superalloy produced by mechanical alloying containing a refractory oxide, preferably yttrium oxide, and characterized by excellent corrosion resistance, high fatigue strength and high temperature stability; and prostheses formed from said superalloy.
    Type: Grant
    Filed: February 20, 1985
    Date of Patent: December 23, 1986
    Assignee: Pfizer Hospital Products Group Inc.
    Inventors: Henry L. Andrews, Gregory E. Gardiner
  • Nonprecious dental alloy
    Patent number: 4514359
    Abstract: A nonprecious alloy for porcelain-bonded dental restorations consists essentially of, in approximate percentage by weight, 25-30 chromium, 5-7 molybdenum, 0-1.0 each manganese and silicon, 0-0.3 carbon and 0-4 each gallium and indium, balance cobalt, these constituents accounting for at least 99.5 percent of the alloy, the sum of the manganese and silicon being at least about 0.5 percent and the sum of the gallium and indium being at least about 1.25 percent.
    Type: Grant
    Filed: March 30, 1983
    Date of Patent: April 30, 1985
    Assignee: Austenal International, Inc.
    Inventor: Henry L. Andrews