Patents by Inventor Francis J. Fox

Francis J. Fox 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 and apparatus for advancing tubing into a draw die
    Patent number: 5487292
    Abstract: The invention is directed to a method and apparatus for advancing tubing into a draw die in reducing the diameter of the tubing. The tubing is advanced forward through opposed rotating tolls which apply compressive stress to the tubing and through a close fitting bushing. High pressure lubricant is pumped through a die socket which creates radial compressive stress on the tubing passing through the die socket into the draw die.
    Type: Grant
    Filed: June 20, 1994
    Date of Patent: January 30, 1996
    Inventor: Francis J. Fox
  • Method and apparatus for forming spiral grooves internally in metal tubing
    Patent number: 5327756
    Abstract: A spinner means and method for forming spiral grooves on the interior surface of tubing including a groove forming means having a plurality of external spiral teeth which contact the tubing forming the grooves wherein said spiral teeth extend in the forward direction and have a helix angle which continually decreases in the forward direction. The method for forming the spiral grooves subjects the tubing interior surface of the tubing to the spinner means having teeth crests which engage the tubing surface when the tubing is being reduced in diameter using only radial forces acting on the crests of the teeth.
    Type: Grant
    Filed: December 31, 1991
    Date of Patent: July 12, 1994
    Inventor: Francis J. Fox