Patents by Inventor Ernest Otto Butts

Ernest Otto Butts 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).

  • Joist
    Patent number: 4015396
    Abstract: A steel joist having an upper chord, a web, and a lower chord; the upper chord consisting of an S shaped cross section elongated member having in one form a lower reverse flange at the base of the S, the flange being connected to the web so that the center of gravity of the joist is in the region of its central axis, the region between the base of the S and the reverse flange including an inclined step.
    Type: Grant
    Filed: June 3, 1975
    Date of Patent: April 5, 1977
    Assignee: Hambro Structural Systems Ltd.
    Inventors: Ernest Otto Butts, Felix F. Laurus