Patents by Inventor Thomas Dunder

Thomas Dunder 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).

  • Colored image on a degradable sheet material and method of formation
    Patent number: 5183723
    Abstract: This invention relates to a method for forming a colored image on a degradable sheet material. As a result, a negative- or positive-working color proofing sheet can be produced on a variety of printing paper stocks. Upon exposure to an actinic radiation source through a screened image and development, it can accurately reproduce the image on the degradable sheet. The construction is useful as a color proof which can be employed to accurately predict the image quality from a lithographic printing process on a variety of printing surfaces.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: February 2, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Stephan J. W. Platzer, Arthur E. Procter, Thomas Dunder
  • Method for forming a colored image on a degradable sheet material
    Patent number: 5100757
    Abstract: This invention relates to a method for forming a colored image on a degradable sheet material. As a result, a negative- or positive-working color proofing sheet can be produced on a variety of printing paper stocks. Upon exposure to an actinic radiation source through a screened image and development, it can accurately reproduce the image on the degradable sheet. The construction is useful as a color proof which can be employed to accurately predict the image quality from a lithographic printing process on a variety of printing surfaces.
    Type: Grant
    Filed: October 21, 1988
    Date of Patent: March 31, 1992
    Assignee: Hoechst Celanese Corporation
    Inventors: Stephan J. W. Platzer, Arthur E. Proctor, Thomas Dunder
  • Diazo negative color proofing process utilizing acrylic/acrylate polymers
    Patent number: 4929532
    Abstract: The invention relates to negative photosensitized sheet constructions which, upon exposure to an actinic radiation source through a screened image, can accurately reproduce said image. The construction is useful as a color proofing film which can be employed to predict the image quality from a lithographic printing process.
    Type: Grant
    Filed: April 12, 1989
    Date of Patent: May 29, 1990
    Assignee: Hoechst Celanese Corporation
    Inventor: Thomas A. Dunder
  • Light sensitive co-condensates
    Patent number: 4533620
    Abstract: Light sensitive condensed copolymers or multi-polymers of at least two distinct diazonium salts of the types specified herein. The product is characterized by high light speed, good shelf life and very good resistance to thermal and electrical degradation.
    Type: Grant
    Filed: August 2, 1983
    Date of Patent: August 6, 1985
    Assignee: American Hoechst Corporation
    Inventors: John E. Walls, Thomas A. Dunder
  • Electrolytic graining of aluminum with nitric and boric acids
    Patent number: 4416972
    Abstract: Aluminum is electrolytically grained in an aqueous solution of nitric and boric acids to provide a surface structure suitable for use as part of a lithographic printing plate. The electrolyte may also optionally contain hydrogen peroxide and/or aluminum nitrate.
    Type: Grant
    Filed: June 26, 1981
    Date of Patent: November 22, 1983
    Assignee: American Hoechst Corporation
    Inventors: John E. Walls, Robert L. Dragon, Thomas A. Dunder
  • Cathodic deposition of light sensitive components
    Patent number: 4414311
    Abstract: Light sensitive compounds are deposited onto a hydrophilized metal substrate, which is preferably aluminum, by means of a direct current electromotive force. The light sensitive component is dissolved in a current carrying solvent. Cathodic, hydrophilized, aluminum is passed through the solution and the EMF applied. The result is a light sensitive coating on the hydrophilized substrate surface.
    Type: Grant
    Filed: March 18, 1982
    Date of Patent: November 8, 1983
    Assignee: American Hoechst Corporation
    Inventors: John E. Walls, Thomas A. Dunder
  • Electrolytic graining of aluminum with hydrogen peroxide and nitric or hydrochloric acid
    Patent number: 4336113
    Abstract: Aluminum is electrolytically grained in an aqueous solution of nitric and/or hydrochloric acids plus hydrogen peroxide to provide a surface structure suitable for use as part of a lithographic printing plate. The electrolyte may also optionally contain aluminum nitrate and/or aluminum chloride.
    Type: Grant
    Filed: June 26, 1981
    Date of Patent: June 22, 1982
    Assignee: American Hoechst Corporation
    Inventors: John E. Walls, Robert L. Dragon, Thomas A. Dunder