Patents by Inventor Mark Lelental

Mark Lelental 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).

  • Patent number: 4144062
    Abstract: A heat developable, photographic material comprising (a) a photographic metal compound with (b) an oxidation-reduction image-forming combination comprising (i) a tellurium (II) or (IV) compound as an oxidizing agent and (ii) a reducing agent provides an improved amplified image. The photographic metal compound can be, for example, photograhic silver halide. A developed image can be provided in the material after imagewise exposure by heating the element to moderately elevated temperatures.
    Type: Grant
    Filed: November 3, 1977
    Date of Patent: March 13, 1979
    Assignee: Eastman Kodak Company
    Inventors: Mark Lelental, Henry J. Gysling
  • Patent number: 4113484
    Abstract: A positive image is formed by imagewise passing a current through a substantially uniform layer of physically developable catalyst having a coverage of 1 .times. 10.sup.-6 to 1 .times. 10.sup.-10 g/cm.sup.2. The catalytic ability of the catalyst layer is destroyed by subjecting the image areas to greater than 1 .times. 10.sup.-8 coulombs/cm.sup.2. Physical development of the thus exposed catalyst layer produces the positive image. A photoconductive element which is useful in this process is also disclosed. This photographic element comprises:(1) a non-catalytic conductive support;(2) a substantially uniform first layer coated on the conductive support comprising a physically developable catalyst having a coverage of 1 .times. 10.sup.-6 to 1 .times. 10.sup.-10 g/cm.sup.
    Type: Grant
    Filed: August 12, 1977
    Date of Patent: September 12, 1978
    Assignee: Eastman Kodak Company
    Inventors: Mark Lelental, William Andrew Light
  • Patent number: 4097281
    Abstract: A heat developable, photographic material comprising, in reactive association, (a) a photosensitive, transition metal carbonyl compound, (b) an oxidation-reduction image-forming combination comprising (i) a tellurium (II) or (IV) compound as an oxidizing agent, with (ii) a reducing agent, and (c) a binder can provide an improved non-silver image. After imagewise exposure of the heat developable material, an image can be developed by merely heating the material.
    Type: Grant
    Filed: October 17, 1977
    Date of Patent: June 27, 1978
    Assignee: Eastman Kodak Company
    Inventors: Sylvia Alice Gardner, Mark Lelental
  • Patent number: 4046569
    Abstract: A process for the formation of phthalocyanine dye images employing palladium nuclei to catalyze the reduction of a leucophthalocyanine to the phthalocyanine dye image by a reducing agent.
    Type: Grant
    Filed: April 14, 1975
    Date of Patent: September 6, 1977
    Assignee: Eastman Kodak Company
    Inventors: Henry J. Gysling, Mark Lelental
  • Patent number: 4042392
    Abstract: A process for the formation of formazan dye images employing nuclei of metals from Groups VIIIB and/or IB of the periodic table to catalyze the reduction of tetrazolium salts to the corresponding formazan dye by a reducing agent.
    Type: Grant
    Filed: April 14, 1975
    Date of Patent: August 16, 1977
    Assignee: Eastman Kodak Company
    Inventors: Henry James Gysling, Mark Lelental
  • Patent number: 3935013
    Abstract: A physical developer composition for latent images comprises a mixture of at least one copper salt and at least one nickel salt and a reducing agent for copper and nickel salts wherein the nickel and copper salts are in such proportions that upon reduction to a metal alloy, the alloy contains from 9 to 98 mole percent copper and from 2 to 91 mole percent nickel.
    Type: Grant
    Filed: November 12, 1973
    Date of Patent: January 27, 1976
    Assignee: Eastman Kodak Company
    Inventor: Mark Lelental