Patents Represented by Attorney M. A. Litman

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  • Dye transfer image process
    Patent number: 4587198
    Abstract: A process for providing a color image comprises exposing a radiation sensitive layer over a vapor deposited colorant layer and vaporizing the colorant to selectively transmit the colorant through the exposed layer. The change in solubility, penetrability and/or crosslinking or polymerization causes differential migration through the exposed layer.
    Type: Grant
    Filed: July 16, 1984
    Date of Patent: May 6, 1986
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Richard S. Fisch
  • Spectral sensitization of photothermographic elements
    Patent number: 4461828
    Abstract: A narrow range of dinuclear spectral sensitizing dyes can be used in photothermographic silver halide emulsions without adversely affecting fog and speed levels with concentration variations.
    Type: Grant
    Filed: May 13, 1983
    Date of Patent: July 24, 1984
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Kenneth W. Metz, Vincent K. Rasbury, Jack E. Reece
  • Visible light sensitive, thermally developable imaging systems
    Patent number: 4460677
    Abstract: A thermally developable imaging system comprises a leuco dye, nitrate ion, and a spectrally sensitized organic compound having photolyzable halogen atoms.
    Type: Grant
    Filed: November 8, 1982
    Date of Patent: July 17, 1984
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: George H. Smith, Peter M. Olofson
  • Image enhancement of photothermographic elements
    Patent number: 4460681
    Abstract: Color photothermographic articles are prepared by having the various color-forming layers separated by organic solvent soluble barrier layers insoluble in the organic solvent used to coat at least one of the adjacent color-forming layers.
    Type: Grant
    Filed: March 15, 1983
    Date of Patent: July 17, 1984
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Robert A. Frenchik
  • Primed surface and charge transfer media
    Patent number: 4454186
    Abstract: An article having a primed surface or improved electric charge transfer properties is disclosed. The surface has discrete sites of inorganic materials thereon.
    Type: Grant
    Filed: February 3, 1982
    Date of Patent: June 12, 1984
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: William A. Hendrickson, Dudley M. Sherman, Hsin-hsin Chou, Vasant V. Kolpe
  • UV-Absorbing compounds and photographic elements containing them
    Patent number: 4323633
    Abstract: It is desirable to protect color photographic dye images from ultraviolet radiation which tends to cause dyes to fade.It has been the practice in the art to add materials into or above the silver halide emulsions which will absorb ultraviolet radiation but allow transmission of visible radiation.One of the best classes of compounds are the 2-(2'-hydroxyphenyl)-benzotriazoles. These materials absorb ultraviolet radiation well, but tend to have poor solubility, crystallize out of the coating solution and emulsion, and diffuse through the photographic element.A novel class of substituted 2-(2'-hydroxyphenyl)-benzotriazoles has been found to reduce many of these problems.
    Type: Grant
    Filed: November 13, 1980
    Date of Patent: April 6, 1982
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Paolo Beretta
  • Irradiation of polyacrylate films in air
    Patent number: 4323591
    Abstract: Polyacrylate materials having certain heterocyclic nuclei within the structure have been found to be readily and polymerizable by irradiation in air. Typically, polyacrylate materials are highly sensitive to the presence of oxygen and do not polymerize fully unless special precautions or conditions are undertaken.
    Type: Grant
    Filed: January 29, 1981
    Date of Patent: April 6, 1982
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Larry A. Wendling, John B. Covington