Patents by Inventor Frederick K. Oldfield

Frederick K. Oldfield 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).

  • Cylinder body of a steel composition
    Patent number: 5133928
    Abstract: A steel composition is especially suitable for pressure vessels and comprises carbon (0.32-0.37%), silicon (0.15-0.35%), manganese (0.60-0.90%), chromium (0.80-1.10%), molybdenum (0.35-0.55%), aluminum (0.01-0.05%), phosphorus up to a maximum of 0.02%, sulphur up to a maximum of 0.005% and nickel up to a maximum of 0.25%. The composition gives enhanced strength and toughness for the purpose using straightforward heat treatment methods.
    Type: Grant
    Filed: August 17, 1990
    Date of Patent: July 28, 1992
    Assignee: Chesterfield Cylinders Limited
    Inventor: Frederick K. Oldfield