Patents by Inventor Cynthia L. Zahka

Cynthia L. Zahka 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).

  • Adhesive composition, and imaging medium comprising this adhesive composition
    Patent number: 5552259
    Abstract: A laminar thermal imaging medium is prepared from a first element comprising a first sheet transparent to image-forming radiation and having at least a surface zone or layer of polymeric material heat-activatable upon subjection of the thermal imaging medium to brief and intense radiation, the first element carrying a layer of porous or particulate image-forming substance having cohesivity in excess of its adhesivity for the polymeric heat-activatable layer, and, on the opposed side of the layer of porous or particulate image-forming substance from the surface zone or layer, a first layer of adhesive, and a second element comprising a second sheet carrying a second layer of adhesive. The second layer of adhesive comprises a polymeric hardenable adhesive comprising a macromolecular organic binder having acidic groups, and a photopolymerizable monomer.
    Type: Grant
    Filed: September 23, 1993
    Date of Patent: September 3, 1996
    Assignee: Polaroid Corporation
    Inventors: Iris B. K. Bloom, Richard A. Minns, Cynthia L. Zahka
  • Method of preparing a laminar thermal imaging medium
    Patent number: 5514525
    Abstract: A laminar thermal imaging medium is prepared from a first element comprising a first sheet transparent to image-forming radiation and having at least a surface zone or layer of polymeric material heat-activatable upon subjection of the thermal imaging medium to brief and intense radiation, the first element carrying a layer of porous or particulate image-forming substance having cohesivity in excess of its adhesivity for the polymeric heat-activatable layer, and, on the opposed side of the layer of porous or particulate image-forming substance from the surface zone or layer, a first layer of adhesive, and a second element comprising a second sheet carrying a second layer of adhesive. The second layer of adhesive comprises a polymeric hardenable adhesive comprising a macromolecular organic binder having acidic groups, and a photopolymerizable monomer.
    Type: Grant
    Filed: May 12, 1995
    Date of Patent: May 7, 1996
    Assignee: Polaroid Corporation
    Inventors: Iris B. K. Bloom, Richard A. Minns, Cynthia L. Zahka