Patents by Inventor Robert A. Guistina

Robert A. Guistina 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: 5786300
    Abstract: A thermal dye transfer assemblage comprising:(I) a dye-donor element comprising a support having thereon sequentially repeating dye layer patches of a dye dispersed in a polymeric binder, at least one of the dye patches containing a deprotonated cationic dye which is capable of being reprotonated to a cationic dye having a N-H group which is part of a conjugated system; and(II) a dye-receiving element comprising a support having thereon a polymeric dye image-receiving layer comprising a polymer having a Tg of less than about 9.degree. C. and being of no or only slight acidity and a hydrated transition metal or metalloid salt of a strong acid, the dye-receiving element being in a superposed relationship with the dye-donor element so that the dye layer is in contact with the polymeric dye image-receiving layer.
    Type: Grant
    Filed: June 19, 1997
    Date of Patent: July 28, 1998
    Assignee: Eastman Kodak Company
    Inventors: Wayne A. Bowman, Robert A. Guistina, Kristine B. Lawrence
  • Patent number: 5744422
    Abstract: A thermal dye transfer assemblage comprising:(I) a dye-donor element comprising a support having thereon sequentially repeating dye layer patches of a dye dispersed in a polymeric binder, at least one of the dye patches containing a pendant basic-substituted dye having the formula:A-(L-B).sub.mwherein:A represents a thermally transferable dye residue,L represents a divalent linking group,B represents a basic substituent, andm represents an integer of from 1 to 3; and(II) a dye-receiving element comprising a support having thereon a polymeric dye image-receiving layer, the dye-receiving element being in a superposed relationship with the dye-donor element so that the dye layer is in contact with the polymeric dye image-receiving layer, the polymeric dye image-receiving layer containing a hydrated transition metal or metalloid salt of a strong acid.
    Type: Grant
    Filed: June 19, 1997
    Date of Patent: April 28, 1998
    Assignee: Eastman Kodak Company
    Inventors: Steven Evans, Helmut Weber, Kristine B. Lawrence, Robert A. Guistina
  • Patent number: 5723247
    Abstract: The image transfer properties and other properties of a fixable toner composition are made more stable by blending the binder resin of the toner with a multiphase organosiloxane block or graft condensation copolymer of low molecular weight which provides organosiloxane domains of particular size and concentration at the toner particle surfaces.
    Type: Grant
    Filed: February 28, 1997
    Date of Patent: March 3, 1998
    Assignee: Eastman Kodak Company
    Inventors: Robert A. Guistina, Peter S. Alexandrovich
  • Patent number: 5674655
    Abstract: This invention comprises a toner particle comprising a polymeric binder and a metal oxide; wherein the metal oxide is blended throughout the polymeric binder.
    Type: Grant
    Filed: October 30, 1996
    Date of Patent: October 7, 1997
    Assignee: Eastman Kodak Company
    Inventors: Robert A. Guistina, Dinesh Tyagi
  • Patent number: 5611847
    Abstract: An ink composition for utilization in ink-jet printing is provided which comprises an aqueous medium, a metallized azo red pigment and, as a sequestering agent, an alkali metal, an alkaline earth metal or an ammonium salt of a linear aliphatic substituted glycine such as a salt of ethylene diamine tetraacetic acid or nitrilo triacetic acid. The composition has been found to remain stable for extended periods of time.
    Type: Grant
    Filed: December 8, 1994
    Date of Patent: March 18, 1997
    Assignee: Eastman Kodak Company
    Inventors: Robert A. Guistina, Domenic Santilli, Douglas E. Bugner
  • Patent number: 4840864
    Abstract: New electrostatographic toners and developers are provided containing new charge-control agents comprising quaternary ammonium salts having the structure ##STR1## wherein R is alkyl having 12 to 18 carbon atoms.
    Type: Grant
    Filed: December 17, 1987
    Date of Patent: June 20, 1989
    Assignee: Eastman Kodak Company
    Inventors: Douglas E. Bugner, Peter S. Alexandrovich, Lawrence P. DeMejo, Robert A. Guistina, James H. Anderson
  • Patent number: 4834920
    Abstract: New quaternary ammonium salts are provided having advantageous utility as charge agents in electrostatographic toners and developers. The salts have the structure ##STR1## wherein R is alkyl having 12 to 18 carbon atoms.
    Type: Grant
    Filed: February 17, 1987
    Date of Patent: May 30, 1989
    Assignee: Eastman Kodak Company
    Inventors: Douglas E. Bugner, Peter S. Alexandrovich, Lawrence P. DeMejo, Robert A. Guistina, James H. Anderson
  • Patent number: 4834921
    Abstract: New quaternary ammonium salts are provided having advantageous utility as charge agents in electrostatographic toners and developers. The salts have the structure ##STR1## wherein R is alkyl having 12 to 18 carbon atoms.
    Type: Grant
    Filed: December 17, 1987
    Date of Patent: May 30, 1989
    Assignee: Eastman Kodak Company
    Inventors: Douglas E. Eugner, Peter S. Alexandrovich, Lawrence P. DeMejo, Robert A. Guistina
  • Patent number: 4812378
    Abstract: New electrostatographic toners and developers are provided containing new charge-control agents comprising quaternary ammonium salts having the structure ##STR1## wherein R is alkyl having 12 to 18 carbon atoms.
    Type: Grant
    Filed: December 17, 1987
    Date of Patent: March 14, 1989
    Assignee: Eastman Kodak Company
    Inventors: Douglas E. Bugner, Peter S. Alexandrovich, Lawrence P. DeMejo, Robert A. Guistina, James H. Anderson
  • Patent number: 4812381
    Abstract: New electrostatographic toners and developers are provided containing new charge-control agents comprising quaternary ammonium salts having the structure ##STR1## wherein R is alkyl having 12 to 18 carbon atoms.
    Type: Grant
    Filed: December 17, 1987
    Date of Patent: March 14, 1989
    Assignee: Eastman Kodak Company
    Inventors: Douglas E. Bugner, Peter S. Alexandrovich, Lawrence P. DeMejo, Robert A. Guistina
  • Patent number: 4806284
    Abstract: New quaternary ammonium salts are provided having advantageous utility as charge agents in electrostatographic toners and developers. The salts have the structure. ##STR1## wherein R is alkyl having 12 to 18 carbon atoms.
    Type: Grant
    Filed: December 17, 1987
    Date of Patent: February 21, 1989
    Assignee: Eastman Kodak Company
    Inventors: Douglas E. Bugner, Peter S. Alexandrovich, Lawrence P. De Mejo, Robert A. Guistina, James H. Anderson
  • Patent number: 4656966
    Abstract: A method and apparatus for developing an electrostatic latent image on an electrographic element with a liquid developer by contacting the liquid developer with a molecular sieve zeolite.
    Type: Grant
    Filed: August 4, 1986
    Date of Patent: April 14, 1987
    Assignee: Eastman Kodak Company
    Inventor: Robert A. Guistina