Patents by Inventor William P. Edwards

William P. Edwards 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).

  • Chromium hot work steel
    Patent number: 5207843
    Abstract: A modified H-13 hot work die steel in which impact toughness and thermal fatigue resistance is greatly improved. The steel consists of in weight %:______________________________________ Carbon (C): 0.34-0.40, Manganese (Mn): 0.25-0.45, Silicon (Si): 0.85-1.15, Chromium (Cr): 5.00-5.40, Nickel (Ni): 0.30 max, Molybdenum (Mo): 1.20-1.50, Vanadium (V): 0.31-0.52, Niobium (Nb): 0.02-0.09, Iron (Fe) and Incidental impurities: Balance ______________________________________The steel also preferably includes about 0.01-0.20 weight % titanium (Ti) and is preferably subjected to premium quality treatment, including remelting and homogenization, either thermal or mechanical (by hot working).
    Type: Grant
    Filed: July 31, 1991
    Date of Patent: May 4, 1993
    Assignee: Latrobe Steel Company
    Inventors: James L. Maloney, William P. Edwards, Mark S. Rodney