Patents by Inventor Thomas C. Petersen

Thomas C. Petersen 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).

  • Thermally-responsive record material
    Patent number: 4794102
    Abstract: A high sensitivity thermal paper resistant to image erasure is disclosed. The thermal paper has a color-forming composition comprising a chromogenic material, an acidic developer material, a water insoluble polymer consisting of poly .alpha.-methylstyrene or .alpha.-methylstyrene/vinyltoluene copolymer, and a thermal modifier. Preferably the thermal modifier is selected from acetoacet-o-toluidine, diphenoxyethane, phenyl-1-hydroxy-2-naphthoate, diheptadecyl ketone and octadecanamide. The disclosed composition when thermally imaged is surprisingly resistant to image erasure and smearing attributable to fingerprint oils.
    Type: Grant
    Filed: September 3, 1987
    Date of Patent: December 27, 1988
    Assignee: Appleton Papers Inc.
    Inventors: Thomas C. Petersen, Dean G. Dalebroux
  • Thermally-responsive record material
    Patent number: 4675707
    Abstract: A thermally-sensitive color-forming composition is disclosed which comprises chromogenic material and certain acidic developer material. Record material comprising this color-forming composition exhibits greatly improved background coloration.
    Type: Grant
    Filed: December 2, 1985
    Date of Patent: June 23, 1987
    Assignee: Appleton Papers Inc.
    Inventors: Steven L. Vervacke, Thomas C. Petersen