Patents by Inventor Robert M. S. Barr

Robert M. S. Barr 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).

  • Process of forming a biaxially oriented thermoplastic tube including the formation and severance of a bubble forming a radially outwardly flared leading tube end
    Patent number: 4735538
    Abstract: A process of forming biaxially oriented tubular articles by repeatedly performing a cycle of operations which includes engaging a thermoplastic tube by a first clamping member over a first region at a trailing end of the tube and engaging the tube by a second clamping mechanism over a second region at a spacing from the first region so as to define between the clamping mechanisms a portion of the tube to be longitudinally stretched and radially expanded; moving the clamping mechanisms apart to stretch the tube portion therebetween longitudinally; admitting pressure fluid into the tube portion to expand it radially and form a biaxially oriented bubble adjacent the leading end of the tube, and severing a substantial part, but not all, of the bubble from the tube to form the tube with a radially outwardly flared end as the leading end of the tube for the succeeding cycle of operations.
    Type: Grant
    Filed: August 22, 1986
    Date of Patent: April 5, 1988
    Assignee: Metal Box p.l.c.
    Inventors: Leonard W. Reed, Robert M. S. Barr, David A. Dick
  • Thermoplastics articles and method and apparatus for making them
    Patent number: 4547416
    Abstract: Biaxially oriented tubular articles which are destined to provide bodies for processable food containers are made from an elongate tube of thermoplastics material as it emerges from an extruder.
    Type: Grant
    Filed: March 7, 1984
    Date of Patent: October 15, 1985
    Assignee: Metal Box Limited
    Inventors: Leonard W. Reed, Robert M. S. Barr, David A. Dick
  • Apparatus for making thermoplastics articles
    Patent number: 4447199
    Abstract: Biaxially oriented tubular articles which are destined to provide bodies for processable food containers are made from an elongate tube of thermoplastics material as it emerges from an extruder.
    Type: Grant
    Filed: November 17, 1981
    Date of Patent: May 8, 1984
    Assignee: Metal Box Limited
    Inventors: Leonard W. Reed, Robert M. S. Barr, David A. Dick