Patents by Inventor Joseph A. Duvall

Joseph A. Duvall 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 preparing a multi-layer metal tube
    Patent number: 6668455
    Abstract: A method for preparing a multi-layer metal tube, comprises the steps of breaking the adhesion between at least a portion of a polymeric layer and an outer surface circumference of a metal tube having a corrosion resistant layer applied thereto, thereby causing the polymeric layer portion to retract and loosely adhere to a non-retracted polymeric layer adjacent the polymeric layer portion; and mechanically removing the retracted portion of the polymetric layer while leaving the corrosion resistant layer intact. An apparatus for achieving the mechanical removal is also disclosed.
    Type: Grant
    Filed: August 10, 2001
    Date of Patent: December 30, 2003
    Assignee: ITT Manufacturing Enterprises, Inc.
    Inventors: Joseph A. Duvall, Kevin E. Nicholls
  • Device for mechanical removal of plastic layer bonded to a metal tube
    Publication number: 20020029454
    Abstract: A method for preparing a multi-layer metal tube, comprises the steps of breaking the adhesion between at least a portion of a polymeric layer and an outer surface circumference of a metal tube having a corrosion resistant layer applied thereto, thereby causing the polymeric layer portion to retract and loosely adhere to a non-retracted polymeric layer adjacent the polymeric layer portion; and mechanically removing the retracted portion of the polymetric layer while leaving the corrosion resistant layer intact. An apparatus for achieving the mechanical removal is also disclosed.
    Type: Application
    Filed: August 10, 2001
    Publication date: March 14, 2002
    Inventors: Joseph A. Duvall, Kevin E. Nicholls