Patents by Inventor Charles H. Weidner

Charles H. Weidner 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).

  • Silver halide light sensitive emulsion layer having enhanced photographic sensitivity
    Patent number: 5747236
    Abstract: A photographic element comprises a support and at least one silver halide emulsion layer in which the silver halide is sensitized with a fragmentable electron donor of the formula X--Y, wherein X is an electron donor moiety and Y is a leaving group other than hydrogen, and wherein:1) X--Y has an oxidation potential between 0 and about 1.4 V; and2) the oxidized form of X--Y undergoes a bond cleavage reaction to give the radical X.sup..cndot. and the leaving fragment Y.In a preferred embodiment of the invention, the radical X.sup..cndot. has an oxidation potential .ltoreq.-0.7V.
    Type: Grant
    Filed: October 30, 1996
    Date of Patent: May 5, 1998
    Assignee: Eastman Kodak Company
    Inventors: Samir Y. Farid, Jerome R. Lenhard, Chin H. Chen, Annabel A. Muenter, Ian R. Gould, Stephen A. Godleski, Paul A. Zielinski, Charles H. Weidner
  • Optical recording elements having recording layers containing cationic azo dyes
    Patent number: 5547727
    Abstract: An optical recording element having a transparent substrate and on the surface of said substrate, a recording layer and a light reflecting layer wherein recording layer comprises a dye selected from the group consisting of cationic azocyanine dyes and mixtures of such dyes and the unrecorded layer is such that the real part of the refractive index (N) at 780 nm is at least 1.8 and the imaginary part (k) is 0.01 to 0.15.
    Type: Grant
    Filed: December 13, 1994
    Date of Patent: August 20, 1996
    Assignee: Eastman Kodak Company
    Inventors: Leslie Shuttleworth, Charles H. Weidner, Michael P. Cunningham
  • Red-emitting organic electroluminescent device
    Patent number: 5409783
    Abstract: Disclosed is a red-emitting organic electroluminescent device comprising in sequence an anode, an organic hole injecting and transporting zone, a doped luminescent zone, an electron transport zone and a cathode, characterized in that said doped luminescent zone is comprised of a fluorescent phthalocyanine compound capable of emitting a wavelength in the range of 660 to 780 nm.
    Type: Grant
    Filed: February 24, 1994
    Date of Patent: April 25, 1995
    Assignee: Eastman Kodak Company
    Inventors: Ching W. Tang, Charles H. Weidner, Dustin L. Comfort
  • Recording and information record elements comprising oxoindolizine and oxoindolizinium dyes
    Patent number: 4446223
    Abstract: Oxoindolizine and oxoindolizinium dyes are useful as radiation absorptive materials in recording elements.
    Type: Grant
    Filed: June 24, 1982
    Date of Patent: May 1, 1984
    Assignee: Eastman Kodak Company
    Inventors: Donald H. Wadsworth, Harold T. Thomas, George L. Fletcher, Charles H. Weidner