Patents by Inventor Robert T. Ault

Robert T. Ault 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).

  • Steel well casing and method of production
    Patent number: 4226645
    Abstract: Steel well casing having the combined properties of excellent resistance to hydrogen sulfide stress corrosion and high yield strength ranging upward from 90,000 to 145,000 psi comprised of an aluminum-killed steel alloyed with chromium, molybdenum and vanadium. The casing is quenched to martensite from an austenitizing temperature in the range of from 1550.degree. to 1700.degree. F. and is tempered in the range of from 1200.degree. to 1400.degree. F. to a maximum hardness of 35 R.sub.C.
    Type: Grant
    Filed: January 8, 1979
    Date of Patent: October 7, 1980
    Assignee: Republic Steel Corp.
    Inventors: George M. Waid, Robert T. Ault