Patents by Inventor Max H. Stern

Max H. Stern 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).

  • Imaging element containing dye masking coupler
    Patent number: 4749641
    Abstract: An imaging element is described which comprises a colorless coupler compound which contains an oxidizable lueco dye moiety and optionally a colorless dye image-forming coupler compound. Following color development a masking dye is obtained by oxidation of the leuco dye moiety in areas where no photographic development occurs.
    Type: Grant
    Filed: September 15, 1986
    Date of Patent: June 7, 1988
    Assignee: Eastman Kodak Company
    Inventors: John E. Kaufman, Max H. Stern
  • Phthalaldehyde adducts
    Patent number: 4596876
    Abstract: Novel adducts of phthalaldehyde are disclosed, as well as imaging compositions and imaging elements incorporating them. A method is also disclosed for minimizing dimensional changes in the element during processing.
    Type: Grant
    Filed: September 14, 1983
    Date of Patent: June 24, 1986
    Assignee: Eastman Kodak Company
    Inventors: Thap DoMinh, Max H. Stern
  • Color-forming sulfonamidodiphenylamines and corresponding sulfonimide dyes
    Patent number: 4499304
    Abstract: Color-forming para-sulfonamidodiphenylamines and their corresponding sulfonimide dyes are useful in imaging materials. The color-forming sulfonamidodiphenylamines are prepared by condensation reactions. The corresponding sulfonimide dyes are formed by oxidation of the color-forming sulfonamidodiphenylamines by means of a suitable oxidizing agent, such as the oxidized form of a cross-oxidizing silver halide developing agent.
    Type: Grant
    Filed: June 8, 1982
    Date of Patent: February 12, 1985
    Assignee: Eastman Kodak Company
    Inventors: Rolf S. Gabrielsen, Patricia A. Graham, James E. Klijanowicz, Max H. Stern
  • Phthalaldehyde adduct and imaging compositions, elements and methods incorporating same
    Patent number: 4410623
    Abstract: Novel adducts of phthalaldehyde are disclosed, as well as imaging compositions and imaging elements incorporating them. A method is also disclosed for minimizing dimensional changes in the element during processing.
    Type: Grant
    Filed: June 15, 1981
    Date of Patent: October 18, 1983
    Assignee: Eastman Kodak Company
    Inventors: Thap DoMinh, Max H. Stern
  • Color-forming para-sulfonamidodiphenylamine dye precursor and sulfonimide dye in photographic material and process
    Patent number: 4390606
    Abstract: A color-forming para-sulfonamidodiphenylamine dye precursor in a photographic material and process enables formation of a sulfonimide dye image by means of cross-oxidation without the need for a coupling reaction. The color-forming para-sulfonamidodiphenylamine dye precursor is useful in a photographic silver halide material for producing (i) a dye image, or (ii) a dye image and silver image. The exposed photographic material is processed to produce (a) a positive dye image, (b) a negative dye and negative silver image, (c) a negative dye image or (d) a positive dye image and a positive silver image.
    Type: Grant
    Filed: July 1, 1982
    Date of Patent: June 28, 1983
    Assignee: Eastman Kodak Company
    Inventors: Rolf S. Gabrielsen, Patricia A. Graham, James E. Klijanowicz, Max H. Stern