Patents by Inventor David A. Stegman

David A. Stegman 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: 5091298
    Abstract: Dyes according to formulas (I), (II), (III), (IV), and (V) below are described. The dyes are useful as low-staining sensitizing dyes for photographic materials. ##STR1## Z.sub.1, Z.sub.2, Z.sub.3, R.sub.1, R.sub.2, L, D, G, X, n, P, and q are defined herein.
    Type: Grant
    Filed: July 19, 1990
    Date of Patent: February 25, 1992
    Assignee: Eastman Kodak Company
    Inventors: Richard L. Parton, Steven G. Link, David A. Stegman, John D. Mee
  • Patent number: 5061618
    Abstract: A photographic element is described comprising a support having thereon a silver halide emulsion layer where the silver halide is sensitized with a dye having the formula: ##STR1## wherein where Z.sub.1, Z.sub.2, Z.sub.3, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, and X are as defined herein.
    Type: Grant
    Filed: March 28, 1990
    Date of Patent: October 29, 1991
    Assignee: Eastman Kodak Company
    Inventors: Richard L. Parton, Annabel A. Muenter, David A. Stegman
  • Patent number: 4975362
    Abstract: A photographic element is described comprising a support having thereon a silver halide emulsion layer comprising silver halide sensitized with a dye of the formula: ##STR1## wherein L.sub.1, L.sub.2, L.sub.3, L.sub.4, L.sub.5, L.sub.6, L.sub.7, L.sub.8, and L.sub.9 each independently represents a substituted or unsubstituted methine group,Z.sub.1 represents the atoms necessary to complete a benzothiazole nucleus, a benzoxazole nucleus, a benzoselenazole nucleus, a benzotellurazole nucleus, or a benzimidazole nucleus, which, in addition to being substituted by --SR.sub.3, is further substituted or unsubstituted.Z.sub.2 represents the atoms necessry to complete a substituted or unsubstituted 5- or 6-membered heterocyclic ring.R.sub.1 and R.sub.2 each independently represents substituted or unsubstituted alkyl or substituted or unsubstituted aryl.R.sub.3 represents substituted or unsubstituted alkyl of from 1 to 4 carbon atoms.m is 1 or 2,n is 0 or 1, andX is a counterion.
    Type: Grant
    Filed: September 26, 1989
    Date of Patent: December 4, 1990
    Assignee: Eastman Kodak Company
    Inventors: Richard L. Parton, Annabel A. Muenter, David A. Stegman
  • Patent number: 4933269
    Abstract: A infrared absorbing filter dye that also imparts a cool image tone after processing is disclosed for use in photographic elements. The dye has the formula: ##STR1## where Z and Z' each independently represents the atoms necessary to complete a substituted or unsubstituted: thiazole nucleus, selenazole nucleus, indole nucleus, imidazole nucleus, or quinoline nucleus,R.sub.1 and R.sub.2 each independently substituted or unsubstituted alkyl or substituted or unsubstituted aryl,Z" represents the atoms necessary to complete a substituted or unsubstituted heterocyclic ring,Q represents the atoms necessary to complete a substituted or unsubstituted carbocyclic ring,m and n each independently represents 0 or 1, andX represents a counterion as needed to balance the charge of the molecule.
    Type: Grant
    Filed: November 27, 1989
    Date of Patent: June 12, 1990
    Assignee: Eastman Kodak Company
    Inventors: Richard L. Parton, David A. Stegman, Ralph W. Jones, Jr.
  • Patent number: 4876181
    Abstract: A dye useful for absorbing infrared radiation in photographic elements, having the structure: ##STR1## is disclosed. In this formula R.sub.1 and R.sub.2 each independently represents sulfoalkyl, carboxyalkyl, or sulfatoalkyl of from 3 to 6 carbon atoms, having at least 3 carbon atoms in the alkyl chain between the nitrogen atom of each Z ring and the sulfo or sulfato group, and at least 2 carbon atoms in the alkyl chain between the nitrogen atom of each Z ring and the carboxy group.R.sub.3 and R.sub.5 are each hydrogen or together represent the atoms necessary to complete 5- or 6-membered carbocyclic ring, and R.sub.4 represents hydrogen, alkyl of 1 to 4 carbon atoms, aryl, cyano, halogen, or ##STR2## where R.sub.6 and R.sub.7 each independently represents alkyl of from 1 to 6 carbon atoms or aryl, or together represent the non-metallic atoms necessary to form a 5- or 6-membered ring.X.sym. represents a cation.Z.sub.1 and Z.sub.
    Type: Grant
    Filed: March 10, 1988
    Date of Patent: October 24, 1989
    Assignee: Eastman Kodak Company
    Inventors: Gary S. Proehl, Anthony D. Gingello, David J. Collett, Richard L. Parton, David A. Stegman, Anthony Adin
  • Patent number: 4871656
    Abstract: A dye useful for absorbing infrared radiation in photographic elements, having the structure: ##STR1## is disclosed. In this formula, R.sub.1 and R.sub.2 each independently represents sulfoalkyl, carboxyalkyl, or sulfatoalkyl, from 2 to 4 carbon atoms, having 2 carbon atoms in the alkyl chain linking the nitrogen atom of each Z ring and the sulfo or sulfato group, and 1 carbon atom in the alkyl chain linking the nitrogen atom of each Z ring and the carboxy group.R.sub.3 and R.sub.5 are each hydrogen or together represent the atoms necessary to complete a 5- or 6-membered carbocyclic ring, and R.sub.4 represents hydrogen, alkyl of 1 to 4 carbon atoms, halogen, cyano, or ##STR2## where R.sub.6 and R.sub.7 each independently represents alkyl of from 1 to 6 carbon atoms or aryl or together represent the non-metallic atoms necessary to form a 5- or 6-membered heterocyclic ring.X.sup..sym. represents a cation.Z.sub.1 and Z.sub.
    Type: Grant
    Filed: March 10, 1988
    Date of Patent: October 3, 1989
    Assignee: Eastman Kodak Company
    Inventors: Richard L. Parton, ANthony D. Gingello, David J. Collett, David A. Stegman, ANthony Adin