Patents Represented by Attorney, Agent or Law Firm Peter H. Kondo
  • Patent number: 4762764
    Abstract: A stable colored liquid developer comprising an insulating organic liquid dispersion medium having dispersed therein negatively charged marking particles comprising a thermoplastic resin core substantially insoluble in the dispersion medium, an amphipathic copolymeric steric stabilizer irreversibly anchored to the thermoplastic resin core, the steric stabilizer being soluble in the dispersion medium, a colored dye imbibed in the thermoplastic resin core, the dye being soluble in the thermoplastic resin core and insoluble in the dispersion medium and a charge control agent selected from the group consisting of a polybutene succinimide, lecithin, basic barium petroleum sulfonates, and mixtures thereof. This liquid developer may be employed to develop electrostatic latent images either on dielectric paper or on an electroreceptor or photoreceptor substrate and the resulting toner image may be transferred to another surface by tape transfer.
    Type: Grant
    Filed: December 23, 1986
    Date of Patent: August 9, 1988
    Assignee: Xerox Corporation
    Inventors: Dominic S. Ng, Raymond W. Wong, Melvin D. Croucher
  • Patent number: 4747992
    Abstract: A process is disclosed for forming at least one thin substantially uniform fluid coating comprising polymeric film forming material on a cylindrical mandrel, solidifying the fluid coating to form a uniform solid coating and separating the uniform solid coating from the mandrel. The process may comprise forming at least one thin substantially uniform fluid coating comprising polymeric film forming material around a cylindrical mandrel, the mandrel having a larger mass or lower thermal conductivity than the polymeric film forming material and a critical surface tension greater than the surface tension of the fluid coating, solidifying the fluid coating to form at least one thin substantially uniform solid coating comprising the polymeric film forming material around the cylindrical mandrel, heating both the uniform solid coating and the mandrel to a temperature at least above the apparent T.sub.
    Type: Grant
    Filed: March 24, 1986
    Date of Patent: May 31, 1988
    Inventors: Donald S. Sypula, Merlin E. Scharfe, Dennis A. Abramsohn, Paul J. Brach, Clifford H. Griffiths, Deborah J. Nichol-Landry, Andrew R. Melnyk, John W. Spiewak, Joseph Mammino, Edward C. Williams, Lieng-Huang Lee, Christine J. Tarnawskyj
  • Patent number: 4738879
    Abstract: A coating system is disclosed comprising apparatus for coating webs comprising a rigid, elongated trough, a cylindrical applicator mounted for rotation about its axis within the trough, the trough having an arcuate upstream liquid retaining surface and an arcuate downstream liquid retaining surface substantially parallel to and closely spaced from the lower surface of the cylindrical applicator to define an arcuate coating zone, a manifold between the upstream liquid retaining surface and the downstream liquid retaining surface, the manifold extending substantially parallel to the axis of the cylindrical applicator, the arcuate downstream liquid retaining surface and the arcuate upstream liquid retaining surface extending from the manifold upwardly a sufficient distance along the periphery of the cylindrical applicator to retain most of any liquid in the coating zone, a wall at each end of the trough to retain the liquid in the coating zone, each of the walls being closely spaced from the adjacent end of the
    Type: Grant
    Filed: July 2, 1986
    Date of Patent: April 19, 1988
    Assignee: Xerox Corporation
    Inventor: John K. Williams
  • Patent number: 4714779
    Abstract: A polymer of the formula ##STR1## wherein .PHI.=phenyl or phenyleneb=0, 1, 2 or 3n=3 or greater.
    Type: Grant
    Filed: November 20, 1980
    Date of Patent: December 22, 1987
    Assignee: Xerox Corporation
    Inventors: S. Richard Turner, John F. Yanus
  • Patent number: 4698196
    Abstract: Apparatus for preparing seamless, creaseless, pliable, thin-walled tubes comprising means to extrude a moving continuous tube of polymeric film material from a die, means to radially stretch the continuous tube as it emerges from the die, means to longitudinally stretch the tube, and means to sever the tube while the tube is in motion to form tube segments while maintaining the tube substantially free of creases. This apparatus may be employed in a process to prepare seamless, creaseless, pliable, thin-walled tubes.
    Type: Grant
    Filed: December 24, 1985
    Date of Patent: October 6, 1987
    Assignee: Xerox Corporation
    Inventor: Ellis Fabian
  • Patent number: 4678691
    Abstract: A composite metal article is disclosed comprising at least a first elongated electroformed hollow member and a second electroformed elongated hollow member, each of the hollow members comprising at least a first sleeve and a second sleeve, one sleeve of each of the hollow members having a perimeter larger than the perimeter of the other sleeve of the same member, at least a segment of the outer surface of one sleeve of the second elongated hollow member being adjacent to and substantially surrounded by the inner surface of one sleeve of the first elongated hollow member.
    Type: Grant
    Filed: October 24, 1985
    Date of Patent: July 7, 1987
    Assignee: Xerox Corporation
    Inventors: William G. Herbert, Jr., Henry G. Grey, Bruce C. Reynolds
  • Patent number: 4664995
    Abstract: An electrostatographic imaging member comprising at least one imaging layer capable of retaining an electrostatic latent image, a supporting substrate layer having an electrically conductive surface, and an electrically conductive ground strip layer adjacent the electrostatographic imaging layer and in electrical contact with the electrically conductive layer, the electrically conductive ground strip layer comprising a film forming binder, conductive particles and crystalline particles dispersed in the film forming binder and a reaction product of a bi-functional chemical coupling agent with both the film forming binder and the crystalline particles. This imaging member may be employed in an electrostatographic imaging process.
    Type: Grant
    Filed: October 24, 1985
    Date of Patent: May 12, 1987
    Assignee: Xerox Corporation
    Inventors: Anthony M. Horgan, Alfred T. LaFrance, Francis J. Wieloch, Robert C. U. Yu
  • Patent number: 4664758
    Abstract: An electroforming process is described comprising providing an elongated electroforming mandrel core, applying a substantially uniform coating of a molten, inert, inorganic, homogeneous, electrically conductive metal or metal alloy to the mandrel core, the metal or metal alloy having a melting point and a surface tension less than the melting point and surface tension of the mandrel core, immersing the mandrel core bearing the coating in an electroforming bath having a surface tension less than the surface tension of the metal or metal alloy, depositing an electroformed metal layer on the coating, the electroformed metal layer having a melting point greater than the metal or metal alloy, melting the metal or metal alloy, and removing the electroformed metal layer from the mandrel core.
    Type: Grant
    Filed: October 24, 1985
    Date of Patent: May 12, 1987
    Assignee: Xerox Corporation
    Inventor: Henry G. Grey
  • Patent number: 4665231
    Abstract: A process for forming finely divided squaraine particles is disclosed comprising dissolving squaraine material in an organic base selected from the group consisting of primary organic amines and secondary organic amines, neutralizing the organic base with an acid selected from the group consisting of organic acids and inorganic acids thereby precipitating the squaraine material as finely divided particles in a liquid medium, and separating the finely divided particles from the liquid medium.
    Type: Grant
    Filed: May 2, 1986
    Date of Patent: May 12, 1987
    Assignee: Xerox Corporation
    Inventors: John F. Yanus, William W. Limburg
  • Patent number: 4654284
    Abstract: An imaging member comprising at least one flexible electrophotographic imaging layer, a flexible supporting substrate layer having an electrically conductive surface and an anti-curl layer, the anti-curl layer comprising a film forming binder, crystalline particles dispersed in the film forming binder and a reaction product of a bi-functional chemical coupling agent with both the film forming binder and the crystalline particles. This imaging member may be employed in an electrostatographic imaging process.
    Type: Grant
    Filed: October 24, 1985
    Date of Patent: March 31, 1987
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Anthony M. Horgan, Francis J. Wieloch
  • Patent number: 4639402
    Abstract: An electrostatographic imaging member comprising a photoconductive layer comprising an organic resin binder and photoconductive particles comprising selenium coated with thin layer of a reaction product of a hydrolyzed aminosilane. This electrostatographic imaging member may be prepared by forming a mixture of an organic resin binder, the photoconductive particles coated with a thin layer of a reaction product of a hydrolyzed aminosilane and a solvent for the binder to form a uniform dispersion, forming the dispersion into a uniform layer, and drying the uniform layer to form a photoconductive layer.
    Type: Grant
    Filed: August 2, 1985
    Date of Patent: January 27, 1987
    Assignee: Xerox Corporation
    Inventors: Satchidanand Mishra, Leon A. Teuscher
  • Patent number: 4609605
    Abstract: An electrophotographic imaging member is disclosed consisting essentially of a supporting substrate, a charge transport layer substantially free of arsenic and tellurium and consisting essentially of selenium and a halogen selected from the group consisting of from about 4 parts per million by weight to about 13 parts per million by weight of chlorine and from about 8 parts per million by weight to about 25 parts per million by weight of iodine and a photoconductive charge generator layer comprising selenium, from about 5 percent to about 20 percent by weight tellurium, from about 0.1 percent to about 4 percent by weight arsenic, and a halogen selected from the group consisting of up to about 70 parts per million by weight of chlorine and up to about 140 parts per million by weight of iodine, one surface of the charge generator layer being in operative electrical contact with the charge transport layer and the other surface of the charge generator layer being exposed to the ambient atmosphere.
    Type: Grant
    Filed: March 4, 1985
    Date of Patent: September 2, 1986
    Assignee: Xerox Corporation
    Inventors: Barry A. Lees, Robert J. Flanagan, Monroe J. Hordon
  • Patent number: 4606934
    Abstract: A process for forming an overcoated electrophotographic imaging member comprising applying on an electrophotographic imaging member a coating in liquid form comprising a cross-linkable siloxanol-colloidal silica hybrid material having at least one silicon bonded hydroxyl group per every three --SiO-- units and a catalyst for the cross-linkable siloxanol-colloidal silica hybrid material, the coating in liquid form having an acid number less than about 1 and curing the cross-linkable siloxanol-colloidal silica hybrid material until the siloxanol-colloidal silica hybrid material forms a hard cross-linked solid organosiloxane-silica hybrid polymer layer.
    Type: Grant
    Filed: September 4, 1984
    Date of Patent: August 19, 1986
    Assignee: Xerox Corporation
    Inventors: Lieng-Huang Lee, Deborah J. Nichol-Landry, Christine J. Tarnawskyj
  • Patent number: 4606986
    Abstract: An unsymmetrical squaraine composition, process for synthesizing the unsymmetrical squaraine composition, devices containing the unsymmetrical squaraine composition, and methods of using the devices. The process for synthesizing the unsymmetrical squaraine composition comprises forming a mixture comprising squaric acid, a long chain primary alcohol, a first tertiary amine, and a second tertiary aromatic amine different from the first tertiary aromatic amine, and heating the mixture in vacuo below the boiling points of the primary alcohol, the first tertiary amine and the second tertiary aromatic amine to form an unsymmetrical squaraine composition. The novel unsymmetrical squaraine composition synthesized by this process may be used in electrostatographic imaging members comprising a supporting substrate and a photoconductive layer comprising the novel unsymmetrical squaraine composition. These electrostatographic imaging members may be utilized in an electrostatographic imaging processes.
    Type: Grant
    Filed: April 5, 1985
    Date of Patent: August 19, 1986
    Assignee: Xerox Corporation
    Inventors: John F. Yanus, William W. Limburg
  • Patent number: 4599286
    Abstract: An electrophotographic imaging member is disclosed comprising a charge generation layer and a charge transport layer, the transport layer comprising an aromatic amine charge transport molecule in a continuous polymeric binder phase and a chemical stabilizer selected from the group consisting of certain nitrone, isobenzofuran, hydroxyaromatic compounds and mixtures thereof. An electrophotographic imaging process using this member is also described.
    Type: Grant
    Filed: December 24, 1984
    Date of Patent: July 8, 1986
    Assignee: Xerox Corporation
    Inventors: William W. Limburg, Dale S. Renfer
  • Patent number: 4595602
    Abstract: A process for forming an overcoated electrophotographic imaging member comprising applying on an electrophotographic imaging member a coating in liquid form comprising a cross-linkable siloxanol-colloidal silica hybrid material having at least one silicon bonded hydroxyl group per every three --SiO-- units on the electrophotographic imaging member and a hydrolyzed ammonium salt of an alkoxy silane having the formula ##STR1## wherein R.sub.1, R.sub.2, and R.sub.3 are independently selected from the group consisting of aliphatic and substituted aliphatic radicals having 1 to 4 carbon atoms, R.sub.4 is selected from the group consisting of aliphatic radicals, substituted aliphatic radicals and the group ##STR2## wherein y is a number from 2 to 4, and R.sub.
    Type: Grant
    Filed: September 4, 1984
    Date of Patent: June 17, 1986
    Assignee: Xerox Corporation
    Inventor: Richard L. Schank
  • Patent number: 4588667
    Abstract: An electrophotographic imaging member comprising a substrate, a ground plane layer comprising a titanium metal layer contiguous to the substrate, a charge blocking layer contiguous to the titanium layer, a charge generating binder layer and a charge transport layer. This photoreceptor may be prepared by providing a substrate in a vacuum zone, sputtering a layer of titanium metal on the substrate in the absence of oxygen to deposit a titanium metal layer, applying a charge blocking layer, applying a charge generating binder layer and applying a charge charge transport layer. If desired, an adhesive layer may be interposed between the charge blocking layer and the photoconductive insulating layer.
    Type: Grant
    Filed: May 15, 1984
    Date of Patent: May 13, 1986
    Assignee: Xerox Corporation
    Inventors: Robert N. Jones, Robert E. Heeks
  • Patent number: 4584253
    Abstract: An electrophotographic imaging member is disclosed comprising a charge generation layer, a contiguous charge transport layer comprising an aromatic amine or hydrazone charge transport molecule in a continuous polymeric binder phase, and a cellulosic hole trapping material located on the same side of the charge transport layer as the charge generation layer, the cellulosic hole trapping material being free of electron withdrawing groups and having the structural formula ##STR1## wherein R is independently selected from the group consisting of hydrogen and a substituted or unsubstituted group selected from the group consisting of an alkyl group containing 1 to 20 carbon atoms, a hydroxyalkyl group containing 1 to 20 carbon atoms, a hydroxyether group containing 1 to 20 carbon atoms and an aminoalkyl group containing 1 to 20 carbon atoms, and n is the number of cellulose repeating units from 1 to 3,000. A process for using this electrophotographic imaging member is also disclosed.
    Type: Grant
    Filed: December 24, 1984
    Date of Patent: April 22, 1986
    Assignee: Xerox Corporation
    Inventors: John W. Lin, Lesley P. Dudek
  • Patent number: 4572883
    Abstract: An electrophotographic imaging member is described comprising a substrate, a layer comprising an amorphous hole injecting material selected from the group consisting of halogen doped selenium, gold, silver, platinum and carbon black, the halogen doped selenium consisting essentially of selenium and between about 200 parts per million and about 2,000 parts per million by weight halogen, and at least one thermal hole generating selenium alloy photoconductive layer. This electrophotographic imaging member may contain other layers such as a hole transport layer, a layer between the hole transport layer and thermal hole generating selenium alloy photoconductive layer, and a thin protective overcoating layer suitable for Carlson type imaging processes. An electrophotographic imaging process employing this electrophotographic imaging member is also described.
    Type: Grant
    Filed: June 11, 1984
    Date of Patent: February 25, 1986
    Assignee: Xerox Corporation
    Inventors: Geoffrey M. T. Foley, Harvey J. Hewitt
  • Patent number: 4563408
    Abstract: An electrophotographic imaging member is disclosed comprising a conductive layer, a charge transport layer comprising an aromatic amine charge transport or hydrazone molecule in a continuous polymeric binder phase, and a contiguous charge generation layer comprising a photoconductive material, a polymeric binder and a hydroxyaromatic antioxidant. An electrophotographic imaging process using this member is also described.
    Type: Grant
    Filed: December 24, 1984
    Date of Patent: January 7, 1986
    Assignee: Xerox Corporation
    Inventors: John W. P. Lin, Lesley P. Dudek, William W. Limburg, Eric J. Schneider