Patents by Inventor Geoffrey R. Armstrong

Geoffrey R. Armstrong 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).

  • Gear
    Patent number: 5242758
    Abstract: A gear having good fatigue strength and corrosion resistance has a body with gear teeth formed of a hot isostatically pressed alloy powder. The alloy is cobalt based and consists of 10 to 35 wt % Cr, 0-22 wt % Ni, 0-20 wt % W, 0-20 wt % Fe, 0-10 wt % V, 0-10 wt % Mo, 0-6 wt % Nb, 0-3 wt % Si, 0-3 wt % C, 0-3 wt % B and 0-1 wt % Mn, the balance, apart from impurities, being cobalt.
    Type: Grant
    Filed: July 9, 1991
    Date of Patent: September 7, 1993
    Assignee: Lucas Industries PLC
    Inventors: Keith N. Hitchcock, Geoffrey R. Armstrong, Bernard A. Rickinson