Patents by Inventor Stephen Cushner

Stephen Cushner 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 thermal processing a photosensitive element
    Patent number: 6797454
    Abstract: A method and apparatus for thermal processing a photosensitive element includes heating a composition layer on a flexible substrate to a melt temperature of an unirradiated area of the composition layer and maintaining the flexible substrate at a temperature below the melt temperature while pressing a heated absorbent layer against the heated composition layer, and repeating these steps for multiple cycles. A further embodiment of the method includes a step of cooling the flexible substrate and layer laminate on each cycle to maintain the flexible substrate at the desired temperature below that of the heated composition layer.
    Type: Grant
    Filed: February 19, 2002
    Date of Patent: September 28, 2004
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Melvin Harry Johnson, David Anthony Belfiore, Mark A. Hackler, Anandkumar Ramakrishnan Kannurpatti, Robert Lee Brown, Stephen Cushner, Robert Finley Drury
  • Methods and apparatus for forming cylindrical photosensitive elements
    Patent number: 5916403
    Abstract: The present invention relates to methods and apparatus for forming seamless cylindrical photosensitive elements of uniform thickness on flexible sleeves. The apparatus for forming a seamless cylindrical photosensitive element of uniform thickness on a flexible sleeve, comprises a mandrel, a mandrel support assembly, a calendering assembly, a drive system and at least a heating element. The methods comprise forming seamless cylindrical photosensitive elements of uniform thickness on flexible sleeves from a stream of molten photopolymerizable material, or a solid or molten sheet of photopolymerizable material. The seamless cylindrical photosensitive elements are formed on polyester sleeves for use on a printing cylinder.
    Type: Grant
    Filed: January 14, 1998
    Date of Patent: June 29, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Stephen Cushner, Roxy Ni Fan, Edward Andrew Calisto, Daniel Francis Sheehan, Jr.
  • Lasers engravable multilayer flexographic printing element
    Patent number: 5804353
    Abstract: A process for making a multilayer flexographic printing plate which involves reinforcing and laser engraving a multilayer flexographic printing element.
    Type: Grant
    Filed: May 11, 1992
    Date of Patent: September 8, 1998
    Assignee: E. I. duPont de Nemours and Company
    Inventors: Stephen Cushner, Roxy Ni Fan, Ernst Leberzammer, John Anthony Quinn, Paul Thomas Shea, Carol Marie Van Zoeren
  • Methods and apparatus for forming cylindrical photosensitive elements
    Patent number: 5798019
    Abstract: The present invention relates to methods and apparatus for forming seamless cylindrical photosensitive elements of uniform thickness on flexible sleeves. The apparatus for forming a seamless cylindrical photosensitive element of uniform thickness on a flexible sleeve, comprises a mandrel, a mandrel support assembly, a calendering assembly, a drive system and at least a heating element. The methods comprise forming seamless cylindrical photosensitive elements of uniform thickness on flexible sleeves from a stream of molten photopolymerizable material, or a solid or molten sheet of photopolymerizable material. The seamless cylindrical photosensitive elements are formed on polyester sleeves for use on a printing cylinder.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: August 25, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Stephen Cushner, Roxy Ni Fan, Edward Andrew Calisto, Daniel Francis Sheehan, Jr.
  • Laser engravable single-layer flexographic printing element
    Patent number: 5798202
    Abstract: A process for making a single layer flexographic printing plate which involves reinforcing and laser engraving a single layer flexographic printing element.
    Type: Grant
    Filed: May 11, 1992
    Date of Patent: August 25, 1998
    Assignee: E. I. duPont de Nemours and Company
    Inventors: Stephen Cushner, Roxy Ni Fan, Ernst Leberzammer, Paul Thomas Shea, Carol Marie Van Zoeren
  • Exposure unit and method for exposing photosensitive materials
    Patent number: 5386268
    Abstract: An exposure unit and method for imaging a photosensitive material includes a source of radiation for exposing the photosensitive material to actinic radiation such that the radiation strikes the photosensitive material at a plurality of angles of incidence, and apparatus for moving the radiation source relative to and in a plane parallel to the photosensitive material. The exposure unit also has a reflector for controlling (1) the proportion of (a) radiation having perpendicular angles of incidence to (b) radiation having non-perpendicular angles of incidence, such that the radiation having non-perpendicular angles is increased, and (2) the distribution of non-perpendicular angles of incidence.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: January 31, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Albert H. Ohlig, Steven W. Nelson, Robert J. Verbiar, Stephen Cushner