Patents by Inventor S. Peter Pappas

S. Peter Pappas 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).

  • Photosensitive materials containing ionic dye compound as initiators
    Patent number: 4977511
    Abstract: A process for making three dimensional models is disclosed which is characterized in that a photohardenable composition is used which comprises a free radical addition polymerizable or crosslinkable compound and an ionic dye-counter ion compound, said compound being capable of absorbing actinic radiation and producing free radicals which initiate free radical polymerization or crosslinking of said compound.
    Type: Grant
    Filed: April 13, 1988
    Date of Patent: December 11, 1990
    Assignee: The Mead Corporation
    Inventors: Peter Gottschalk, Douglas C. Neckers, Gary B. Schuster, Paul C. Adair, S. Peter Pappas
  • Photosensitive materials and compositions containing ionic dye compounds as initiators and thiols as autooxidizers
    Patent number: 4937159
    Abstract: A photohardenable composition comprising a free radical addition polymerizable or crosslinkable compound and an ionic dye-counter ion compound, said compound being capable of absorbing actinic radiation and producing free radicals which initiate free radical polymerization or crosslinking of said compound; and photosensitive materials incorporating the same.
    Type: Grant
    Filed: December 7, 1988
    Date of Patent: June 26, 1990
    Assignee: The Mead Corporation
    Inventors: Peter Gottschalk, Douglas C. Neckers, Gary B. Schuster, Paul C. Adair, S. Peter Pappas