Patents by Inventor Albert W. Forrest, Jr.

Albert W. Forrest, Jr. 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).

  • Thin polyester film containing cubic calcium carbonate particles suitable for capacitor, digital stencil and thermal transfer media
    Patent number: 5595819
    Abstract: Polyester film is disclosed having a thickness not greater than six microns with cubic calcium carbonate incorporated therein resulting in a Kt.sup.-0.5 of at least 21, where K is a stack stiffness constant and t is film thickness in microns. The film exhibits excellent slittability and winding performance, providing film rolls of uniform hardness with sufficient compressive strength to avoid film buckling. The film can be employed in capacitors, digital stencils and thermal transfer media.
    Type: Grant
    Filed: April 21, 1995
    Date of Patent: January 21, 1997
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Virgil L. Anderson, Gusty Feyder, Cathy Vanderdonckt, Albert W. Forrest, Jr., Patrick H. Young
  • Tenter clips for use in stretching thermoplastic film in a tenter frame
    Patent number: 5416959
    Abstract: A tenter clip is provided for gripping a web of thermoplastic film between the curved surface of a toggle arm and an anvil surface which is tapered at each of its ends. The surface configurations of the toggle arm and anvil define effective surfaces for gripping the film while allowing the film to stretch under these surfaces. Beads are formed at the edges of the web during stretching. These beads wedge into substantially V-shaped gripping regions defined by the toggle arm and anvil to assist in the stretching operation.
    Type: Grant
    Filed: March 1, 1994
    Date of Patent: May 23, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Albert W. Forrest, Jr.
  • Expandable mandrel
    Patent number: 5314135
    Abstract: An expandable mandrel for mounting a core for winding, in which inner elements are moved inwardly by a floating screw to cam outer elements outwardly to grip the core. The screw is not fixed in the axial direction. Each of the inner elements has a tapered surface slidably positioned in operative relationship with an opposed tapered surface on each of the outer elements. As the inner elements move inwardly the sliding contact of these tapered surfaces cam the outer elements into gripping contact with the inner surface of the core.
    Type: Grant
    Filed: August 12, 1991
    Date of Patent: May 24, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Albert W. Forrest, Jr., Mark R. Jones
  • Apparatus for winding film
    Patent number: 4850545
    Abstract: An apparatus for winding rolls of thin, wide film. High quality rolls free from circumferential ridges are wound by pressing a segmented bowed roll against a winding roll.
    Type: Grant
    Filed: December 8, 1983
    Date of Patent: July 25, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Raymond M. Ballard, Albert W. Forrest, Jr.
  • Device for biaxially stretching film
    Patent number: 4679283
    Abstract: A device is disclosed for a variable speed carrier with power input from a chain drive to a sprocket on the carrier and power output to cones affixed to the sprocket and running on a pair of rails of variable spacing.
    Type: Grant
    Filed: April 30, 1985
    Date of Patent: July 14, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Albert W. Forrest, Jr.
  • Method and apparatus for the electrostatic pinning of polymeric webs
    Patent number: 4534918
    Abstract: A method and apparatus for enhancing the electrostatic pinning force on a freshly cast, polymeric web by generating primary and secondary electric fields and localizing the flow of current in the secondary field at spaced points through the width of the web. This is achieved by providing conductive pins projecting from a secondary electrode toward a primary electrode.
    Type: Grant
    Filed: October 27, 1983
    Date of Patent: August 13, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Albert W. Forrest, Jr.