Patents by Inventor George L. Fletcher, Jr.

George L. Fletcher, Jr. 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).

  • Oxoindolizine and oxoindolizinium compounds useful as dyes
    Patent number: 4577024
    Abstract: Oxoindolizine and oxoindolizinium dyes are novel compounds useful in imaging, such as laser recording and reading. These dyes are formed by (1) the reaction of a cyclopropenone and a pyridine compound, (2) by reaction of (a) color-forming couplers with (b) reaction products from the reaction of cyclopropenones with pyridine compounds, or (3) by condensation reactions of indolizinols, indolizinones, and indolizinium ions.
    Type: Grant
    Filed: August 27, 1982
    Date of Patent: March 18, 1986
    Assignee: Eastman Kodak Company
    Inventors: George L. Fletcher, Jr., Steven L. Bender, Donald H. Wadsworth
  • Photographic materials and processes comprising oxoindolizine and oxoindolizinium compounds
    Patent number: 4368247
    Abstract: Oxoindolizine and oxoindolizinium dyes are useful in photographic materials and processes as image dyes. These dyes are formed in unexposed areas of photographic materials, especially photothermographic materials, by the reaction of a photosensitive cyclopropenone with a pyridine compound. Oxoindolizine and oxoindolizinium dyes are alternatively formed by (1) reaction of a photosensitive cyclopropenone with a pyridine compound and (2) reaction of the resulting product with a color forming coupler. The photographic material is imagewise exposed and then heated to a processing temperature to form a dye image. Alternatively, the oxoindolizine and oxoindolizinium dyes are produced by imbibing at least one of the reactants into the photographic material comprising a photosensitive cyclopropenone.
    Type: Grant
    Filed: June 29, 1981
    Date of Patent: January 11, 1983
    Assignee: Eastman Kodak Company
    Inventors: George L. Fletcher, Jr., Steven L. Bender, Donald H. Wadsworth
  • Photothermographic material and process
    Patent number: 4283477
    Abstract: In a photothermographic element comprising (A) at least one photosensitive layer comprising a photosensitive component, such as photosensitive silver halide or a diazotype photosensitive material, (B) at least one layer comprising a processing agent for the photosensitive component and (C) a separation polymer between (A) and (B), increased preexposure storage stability is provided by a polysulfonamide as separation polymer (C). After imagewise exposure of the photothermographic element, an image can be developed by merely heating the element to moderately elevated temperatures.
    Type: Grant
    Filed: November 2, 1978
    Date of Patent: August 11, 1981
    Assignee: Eastman Kodak Company
    Inventors: George L. Fletcher, Jr., Richard A. deMauriac, Stewart H. Merrill
  • N-(Vinylphenyl) sulfonamides
    Patent number: 4064168
    Abstract: Novel N-(vinylphenyl)sulfonamides and polymers thereof including copolymers of N-(vinylphenyl)sulfonamides and styrene are prepared by reacting 4-vinylaniline with an amine and a sulfonyl chloride in the presence of an acid acceptor to produce the monomer to be polymerized. The homo- and copolymers of these N-(vinylphenyl)sulfonamides are useful as vesiculating matrices in vesicular elements.
    Type: Grant
    Filed: December 20, 1976
    Date of Patent: December 20, 1977
    Assignee: Eastman Kodak Company
    Inventors: Carl Kotlarchik, Jr., Louis M. Minsk, George L. Fletcher, Jr.
  • Sulfonamide compounds and polymers derived therefrom
    Patent number: 4032518
    Abstract: Novel N-(vinylphenyl)sulfonamides and polymers thereof including copolymers of N-(vinylphenyl)sulfonamides and styrene are prepared by reacting 4-vinylaniline with an amine and a sulfonyl chloride in the presence of an acid acceptor to produce the monomer to be polymerized. The homo- and copolymers of these N-(vinylphenyl)sulfonamides are useful as vesiculating matrices in vesicular elements.
    Type: Grant
    Filed: January 16, 1975
    Date of Patent: June 28, 1977
    Assignee: Eastman Kodak Company
    Inventors: Carl Kotlarchik, Jr., Louis M. Minsk, George L. Fletcher, Jr.
  • Polysulfonamide vesicular binders and processes of forming vesicular images
    Patent number: 4032344
    Abstract: A light-sensitive vesicular imaging composition comprising a vesiculating agent which liberates gas upon exposure to activating radiation, and a binder which is a sulfonamide polymer having the sulfur-nitrogen linkage either in the polymer chain or as a pendant moiety. The composition is coated as a thin film. Imagewise irradiation of the element causes gas bubbles to be released in the exposed areas, which bubbles may be developed by overall heating to a visible record.
    Type: Grant
    Filed: December 29, 1975
    Date of Patent: June 28, 1977
    Assignee: Eastman Kodak Company
    Inventors: George L. Fletcher, Jr., Stewart H. Merrill, Carl Kotlarchik, Jr.