Patents by Inventor John I. Crichton

John I. Crichton 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).

  • Method for coiling twist free steel bars
    Patent number: 5170653
    Abstract: Disclosed is a method of coiling steel bars, especially hexagonal bars, with a twist free coil in a continuous rolling mill equipped with pouring reels. Disclosed is the use of pinch rolls to prevent the twisting of the bar as it is being coiled.
    Type: Grant
    Filed: September 7, 1990
    Date of Patent: December 15, 1992
    Assignee: Bethlehem Steel Corporation
    Inventors: George R. Lastowski, John I. Crichton