Patents Represented by Attorney Willard G. Montgomery
  • Patent number: 5283150
    Abstract: A method is described for the preparation of electrostatographic toner particles which involves the surface treatment of pigments using a low melting point highly reactive wax. The method involves preparing a melt dispersion comprising a pigment, a polymeric binder and a low melting point wax at elevated temperatures, the wax melting and coating the surface of the pigment. The melt dispersion is then used as a component of the organic phase in a limited coalescence process.
    Type: Grant
    Filed: May 28, 1992
    Date of Patent: February 1, 1994
    Assignee: Eastman Kodak Company
    Inventors: Dinesh Tyagi, Donna A. DiPrima
  • Patent number: 5283147
    Abstract: Electrostatographic toner materials containing a magenta pigment which is a metal coordination complex of a substituted 6-arylazo-3-pyridinol compound are disclosed. These pigments are formulated with fusible polymeric binders to provide a toner which exhibits excellent triboelectric properties and improved magenta color and hue when utilized in the electrostatographic process to produce colored electrophotographic images.
    Type: Grant
    Filed: May 27, 1992
    Date of Patent: February 1, 1994
    Assignee: Eastman Kodak Company
    Inventors: Brian H. Johnston, Thomas H. Whitesides
  • Patent number: 5283149
    Abstract: A method is described for the preparation of electrostatographic toner particles which involves the surface treatment of a pigment by depositing thereon a coating of a low melting point wax. The method involves preparing a mixture of a wax solution and a pigment dispersion which is heated to a temperature sufficient to assure dissolution of wax and permitting the mixture to cool slowly to room temperature at which point a coating of wax is deposited upon the surface of the pigment. The wax coated pigment particles are then used as a component of the organic phase in a limited coalescence process.
    Type: Grant
    Filed: May 28, 1992
    Date of Patent: February 1, 1994
    Assignee: Eastman Kodak Company
    Inventors: Dinesh Tyagi, Donna A. DiPrima, Louis J. Sorriero
  • Patent number: 5268249
    Abstract: Carrier particles suitable for magnetic brush development comprising hard magnetic ferrite material having a single phase, W-type hexagonal crystalline structure represented by the formula MFe.sub.16 Me.sub.2 O.sub.27 where M is strontium or barium and Me is a divalent transition metal selected from the group consisting of nickel, cobalt, copper, zinc, manganese, magnesium, iron and mixtures thereof, exhibiting a coercivity of approximately 100 to 300 Oersteds when magnetically saturated and an induced magnetic moment of at least 60 EMU/g when in an applied magnetic field of 1000 Oersteds are disclosed. Also disclosed are electrostatic two-component dry developer compositions comprising charged toner particles mixed with oppositely charged carrier particles comprising the magnetically hard ferrite material described above and a method of developing an electrostatic charge pattern by contacting the charge pattern with a two-component dry developer composition described above.
    Type: Grant
    Filed: October 29, 1992
    Date of Patent: December 7, 1993
    Assignee: Eastman Kodak Company
    Inventors: Bijay S. Saha, Alec N. Mutz
  • Patent number: 5255057
    Abstract: An electrostatic latent image on a photoconductor of an electrophotographic device is developed by a gray scale monocomponent nonmagnetic development system using a combination of AC and DC bias voltages applied to a developer roller and a monocomponent nonmagnetic developer applied to the developer roller by an adder roller. The developer comprises a mixture of toner particles charged to one polarity and transparent beads charged to the opposite polarity, by triboelectric charging in bulk in an alternating field between the two rollers, rather than by friction contact with apparatus surfaces. The adder roller applies the charged mixture to the developer roller for developing the latent image in an electric field to an image density determined by the magnitude of the DC bias. A DC bias may be applied to the adder roller, especially to provide a gradient relative to the DC component of the developer roller bias for driving the bulk charged mixture onto the developer roller.
    Type: Grant
    Filed: May 29, 1992
    Date of Patent: October 19, 1993
    Assignee: Eastman Kodak Company
    Inventors: Eric C. Stelter, Joseph E. Guth, William Vreeland, Thomas A. Jadwin
  • Patent number: 5252406
    Abstract: Disclosed is a pigment receiving support for electrostatic transfer.The support comprises a base of transparent or non-transparent plastic material and a receiving layer. The receiving layer comprises a surface-active agent and a hydrophilic binder. The concentration of the surface-active agent is at least 1 mg/dm.sup.2, and is at least 2 times greater than that of the hydrophilic binder, preferably 10 times greater than that of the hydrophilic binder.
    Type: Grant
    Filed: December 12, 1991
    Date of Patent: October 12, 1993
    Assignee: Eastman Kodak Company
    Inventors: Bernard A. Eid, Jeannine Rigola
  • Patent number: 5250357
    Abstract: The invention provides rolls, belts and other biasable members having at least one layer or coating of an elastomeric resilient polyurethane formed by reacting (a) a polyisocyanate prepolymer comprising the reaction product of a saturated aliphatic polyisocyanate, a saturated cycloaliphatic polisocyanate, or an aromatic polyisocyanate and a polyol free of aliphatic unsaturation, preferably a polyalkylene glycol in which the alkylene group contains 2 to 8 carbon atoms, and (b) a hardening mixture comprising a polyol of (a) or a diamine free of aliphatic unsaturation, or a mixture thereof and, as a conductivity control agent, from 0.001 to 5.0 weight percent, based on the total weight of (b), of a complex of ethylene glycol or an oligoethylene glycol selected from the group consisting of di-, tri- and tetraethylene glycol with an ionizable antimony halide salt selected from the group consisting of antimony trifluoride, antimony trichloride, antimony tribromide and antimony triiodide.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: October 5, 1993
    Assignee: Eastman Kodak Company
    Inventors: John C. Wilson, William B. Vreeland
  • Patent number: 5221590
    Abstract: The present invention relates to a photoelectrographic element having a conductive layer in electrical contact with an acid photogenerating layer which is free of photopolymerizable materials and contains an electrically insulating binder and an onium acid photogenerator. A dye or pigment which undergoes a color density or hue shift upon exposure with radiation is included in the photoelectrographic element. A method for forming images with this element is also disclosed.
    Type: Grant
    Filed: April 15, 1991
    Date of Patent: June 22, 1993
    Assignee: Eastman Kodak Company
    Inventor: Douglas E. Bugner
  • Patent number: 5219703
    Abstract: The present invention relates to laser-induced thermal dye transfer using heat-transferable dyes, bleachable and heat-transferable near-infrared absorbing sensitizers, acid-photogenerating compounds, and optional near-ultraviolet absorbing sensitizers. The combination of the near-infrared absorbing sensitizer and acid-photogenerating compounds effects transfer of the heat-transferable dyes and bleaching of the near-infrared absorbing sensitizer to eliminate unwanted visible light absorption. The acid-photogenerating compound may be present in either the dye-donor or dye-receiver element. If the acid-photogenerator is in the dye-donor, bleaching will occur upon initial exposure of the dye-donor to near-infrared or near-ultraviolet radiation. If present in the dye-receiver element, bleaching will occur upon subsequent exposure of the dye receiver to near-infrared or near-ultraviolet radiation.
    Type: Grant
    Filed: February 10, 1992
    Date of Patent: June 15, 1993
    Assignee: Eastman Kodak Company
    Inventors: Douglas E. Bugner, William Mey
  • Patent number: 5217838
    Abstract: The invention provides rolls, belts and other biasable members having at least one layer or coating of an elastomeric resilient polyurethane formed by reacting (a) a polyisocyanate prepolymer comprising the reaction product of a saturated aliphatic polyisocyanate, a saturated cycloaliphatic polyisocyanate, or an aromatic polyisocyanate and a polyol free of aliphatic unsaturation, preferably a polyalkylene glycol in which the alkylene group contains 2 to 8 carbon atoms, and (b), a hardening mixture comprising a polyol of (a) or a diamine free of aliphatic unsaturation, or a mixture thereof and, as a conductivity control agent, from 0.001 to 5.0 weight percent, based on the total weight of (b), of a complex of ethylene glycol or an oligoethylene glycol selected from the group consisting of di-, tri- and tetraethylene glycol with an ionizable metal halide salt selected from the group consisting of stannic tetrafluoride, stannic tetrachloride, stannic tetrabromide and stannic tetraiodide.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: June 8, 1993
    Assignee: Eastman Kodak Company
    Inventors: John C. Wilson, William B. Vreeland
  • Patent number: 5212031
    Abstract: A photoelectrographic element comprising a conductive layer in electrical contact with an acid photogenerating layer which is (a) free of photopolymerizable materials and (b) comprises an electrically insulating binder and an acid photogenerator is disclosed in which the binder comprises a polymer having as a repeating unit thereof a moiety selected from the group consisting of: ##STR1## wherein R represents an alkylene group having 2, 4 or 6 carbon atoms and X represents an aromatic radical. A method of forming images with the element also is disclosed.
    Type: Grant
    Filed: December 23, 1991
    Date of Patent: May 18, 1993
    Assignee: Eastman Kodak Company
    Inventors: Douglas E. Bugner, Louis J. Sorriero, Sherry L. Marlowe
  • Patent number: 5212032
    Abstract: The invention provides rolls, belts and other biasable members having at least one layer or coating of an elastomeric resilient polyurethane formed by reacting (a) a polyisocyanate prepolymer comprising the reaction product of a saturated aliphatic polyisocyanate, a saturated cycloaliphatic polyisocyanate, or an aromatic polyisocyanate and a polyol free of aliphatic unsaturation, preferably a polyalkylene glycol in which the alkylene group contains 2 to 8 carbon atoms, and (b) a hardening mixture comprising a polyol of (a) or a diamine free of aliphatic unsaturation, or a mixture thereof and, as a conductivity control agent, from 0.001 to 5.0 weight percent, based on the total weight of (b), of a complex of ethylene glycil or an oligoethylene glycol selected from the group consisting of di-, tri- and tetraethylene glycol with an ionizable ferric halide salt selected from the group consisting of ferric flouride, ferric chloride and ferric bromide.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: May 18, 1993
    Assignee: Eastman Kodak Company
    Inventors: John C. Wilson, William B. Vreeland
  • Patent number: 5212035
    Abstract: New electrostatographic toners and developers are provided containing novel charge control agents comprising ester-containing quaternary pyridinium salts having the structure: ##STR1## wherein R.sub.1 is alkyl or aryl, X is CH.sub.2n, Y is hydrogen, alkyl, alkoxy or halogen, Z.crclbar. is an anion and n is an integer from 2 to 6.Such ester-containing quaternary pyridinium salts also cause toner particles containing them to display lower fusing temperatures and improved adhesion indexes.
    Type: Grant
    Filed: July 18, 1991
    Date of Patent: May 18, 1993
    Assignee: Eastman Kodak Company
    Inventors: John C. Wilson, Alexandra D. Bermel
  • Patent number: 5204198
    Abstract: The present invention relates to a photoelectrographic element having a conductive layer in electrical contact with an acid photogenerating layer which is free of photopolymerizable materials and contains an electrically insulating binder and a nonionic sulfonic acid photogenerator. A method of forming images with this element is also disclosed.
    Type: Grant
    Filed: October 28, 1991
    Date of Patent: April 20, 1993
    Assignee: Eastman Kodak Company
    Inventors: Douglas E. Bugner, Jeanne E. Kaeding, Michel F. Molaire
  • Patent number: 5198320
    Abstract: Electrostatographic toners and developers, containing binder polymers that also function as charge agents are disclosed. The toner is prepared by a limited coalescence process and comprises binder polymer particles that have a surface layer of smaller polymeric stabilizer particles that are covalently bonded through a plurality of oxygen linkages to a polyorganosiloxane oligomer containing pendant charge-control moieties.
    Type: Grant
    Filed: December 30, 1991
    Date of Patent: March 30, 1993
    Assignee: Eastman Kodak Company
    Inventors: William B. Vreeland, Dinesh Tyagi, Zona R. Pierce
  • Patent number: 5196538
    Abstract: New ester-containing quaternary pyridinium salts are provided having advantageous utility as charge control agents in electrostatographic toners and developers. The salts have the structure: ##STR1## wherein R.sub.1 is alkyl or aryl, X is --CH.sub.2 --.sub.n, Y is hydrogen, alkyl, alkoxy or halogen, Z.crclbar. is an anion and n is an integer from 1 to 6.Such ester-containing quaternary pyridinium salts also cause toner particles containing them to display lower fusing temperatures and improved paper adhesion indexes.
    Type: Grant
    Filed: July 18, 1991
    Date of Patent: March 23, 1993
    Assignee: Eastman Kodak Company
    Inventors: John W. Wilson, Alexandra D. Bermel
  • Patent number: 5196539
    Abstract: New ester-containing quaternary pyridinium salts are provided having advantageous utility as charge control agents in electrostatographic toners and developers. The salts have the structure: ##STR1## wherein R.sub.1 is alkyl or aryl, X is --CH.sub.2 --.sub.n, Y is hydrogen, alkyl, alkoxy or halogen, Z.sup..crclbar. is an anion and n is an integer from 2 to 6.Such ester-containing quaternary pyridinium salts also cause toner particles containing them to display lower fusing temperature and improved paper adhesion indexes.
    Type: Grant
    Filed: July 18, 1991
    Date of Patent: March 23, 1993
    Assignee: Eastman Kodak Company
    Inventors: John W. Wilson, Alexandra D. Bermel
  • Patent number: 5190841
    Abstract: Disclosed is an interdispersed two-phase ferrite composite which comprises, as a ferromagnetic phase, a magnetically hard ferrite material having a hexagonal crystalline structure of the general formula R.sub.x P.sub.(1-x) Fe.sub.12 O.sub.19 where R is selected from rare earth elements, P is selected from the group consisting of strontium, barium, lead, calcium and mixtures thereof and x has a value of from about 0.1 to about 0.4 exhibiting a coercivity of at least 300 Oersteds when magnetically saturated and an induced magnetic moment of at least 20 EMU/g when in an applied magnetic field of 1000 Oersteds and, as a ferroelectric phase, a ferroelectric material comprised of at least one of the double oxides of titanium, zirconium, tin, hafnium or germanium and either an alkaline earth or lead or cadmium, in which the mole ratio of the ferromagnetic phase to the ferroelectric phase is from about 1:1 to about 1:4.
    Type: Grant
    Filed: December 19, 1991
    Date of Patent: March 2, 1993
    Assignee: Eastman Kodak Company
    Inventors: Bijay S. Saha, Alec N. Mutz, Robert E. Zeman
  • Patent number: 5190842
    Abstract: Disclosed is an interdispersed two-phase ferrite composite which comprises, as a ferromagnetic phase, a magnetically hard ferrite material having a hexagonal crystalline structure of the general formula MO.6Fe.sub.2 O.sub.3 in which M is selected from the group consisting of strontium, barium, lead and mixtures thereof exhibiting a coercivity of at least 300 Oersteds when magnetically saturated and an induced magnetic moment of at least 20 EMU/g when in an applied magnetic field of 1000 Oersteds and, as a ferroelectric phase, a ferroelectric material comprised of at least one of the double oxides of titanium, zirconium, tin, hafnium or germanium and either an alkaline earth or lead or cadmium, in which the mole ratio of the ferromagnetic phase to the ferroelectric phase is from about 1:1 to about 1:4.
    Type: Grant
    Filed: December 19, 1991
    Date of Patent: March 2, 1993
    Assignee: Eastman Kodak Company
    Inventors: Bijy S. Saha, Alec N. Mutz, Robert E. Zeman
  • Patent number: 5187037
    Abstract: New electrostatographic toners and developers are provided containing novel charge control agents comprising ester-containing quaternary ammonium salts having the structure: ##STR1## wherein R.sub.1 is alkyl or aryl, R.sub.2 is alkyl or aryl, R.sub.3 is alkylene, arylene or arylendialkylene, R.sub.4 is alkyl, aryl or aralkyl, R.sub.5 is alkyl or aryl, R.sub.6 is alkyl, aryl, or aralkyl, R.sub.7 is alkyl or aryl, X is ##STR2## Z.sup..crclbar. is an anion and n is an integer from 2 to 6. Such ester-containing quaternary ammonium salts also cause toner particles containing them to display lower fusing temperatures and improved paper adhesion indexes.
    Type: Grant
    Filed: July 18, 1991
    Date of Patent: February 16, 1993
    Assignee: Eastman Kodak Company
    Inventors: John W. Wilson, Alexandra D. Bermel