Patents by Inventor William T. Gruenbaum

William T. Gruenbaum 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).

  • Electrophotographic recording elements containing photoconductive perylene pigments
    Patent number: 5019473
    Abstract: An electrophotographic recording element having a layer comprising a photoconductive perylene pigment, as a charge generation material, that is sufficiently finely and uniformly dispersed in a polymeric binder to provide the element with excellent electrophotographic speed. The perylene pigments are perylene-3,4,9,10-tetracarboxylic acid imide derivatives.
    Type: Grant
    Filed: February 23, 1990
    Date of Patent: May 28, 1991
    Assignee: Eastman Kodak Company
    Inventors: Khe C. Nguyen, William T. Gruenbaum
  • Electrophotographic recording elements containing a combination of photoconductive perylene materials
    Patent number: 4968571
    Abstract: An electrophotographic recording element comprising a combination of photoconductive perylene materials that are dispersed in a binder to form layers having excellent photosensitivity and resistance to abrasion. The materials are perylene-3,4,9,10-tetracarboxylic acid imide derivatives that contain a phenethyl radical bonded to a 3,4-dicarboximide nitrogen atom.
    Type: Grant
    Filed: July 21, 1989
    Date of Patent: November 6, 1990
    Assignee: Eastman Kodak Company
    Inventors: William T. Gruenbaum, Khe C. Nguyen, Jeanne E. Kaeding
  • Multiple xeroprinted copies from a single exposure using photosensitive film buffer element
    Patent number: 4898797
    Abstract: Disclosed is a method of improving the sharpness of multiple copies made from a single imagewise exposure using an electrostatographic film buffer element having an insulating layer in between a conductive layer and a photoconductive layer, where the element is simultaneously charged and imagewise exposed and then uniformly exposed with light to bury the charges. The improvement consists of performing the uniform exposure with light that is absorbed by the photoconductive layer and does not penetrate through the photoconductive layer to the insulating layer.
    Type: Grant
    Filed: July 18, 1988
    Date of Patent: February 6, 1990
    Assignee: Eastman Kodak Company
    Inventors: William T. Gruenbaum, William Mey, Kelly S. Robinson
  • Colored electroscopic toners containing quenched esterified rhodamine dyes
    Patent number: 4711832
    Abstract: A colored, transparent electroscopic toner is provided comprising:(a) a polymeric binder,(b) a rhodamine dye having a non-lactonizing ester-containing phenyl group in the 9-position, and(c) a quencher dye.
    Type: Grant
    Filed: May 5, 1986
    Date of Patent: December 8, 1987
    Assignee: Eastman Kodak Company
    Inventors: William T. Gruenbaum, Julie P. Harmon, Luther C. Roberts