Patents by Inventor Yuhua Tong

Yuhua Tong 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: 7410738
    Abstract: A photoconductive imaging member containing an optional supporting substrate, an optional hole blocking layer thereover, a photogenerating layer and a charge transport layer, and wherein the charge transport layer contains a phenol of, for example, the alternative formulas
    Type: Grant
    Filed: February 10, 2004
    Date of Patent: August 12, 2008
    Assignee: Xerox Corporation
    Inventors: John F. Yanus, Kenny-Tuan T. Dinh, Markus R. Silvestri, H. Bruce Goodbrand, M. John Hinckel, Dale S. Renfer, Yuhua Tong
  • Publication number: 20080153025
    Abstract: Processes for producing toner are provided which utilize reactive coalescing agents in forming the toner particles, as well as toners produced by such processes.
    Type: Application
    Filed: December 20, 2006
    Publication date: June 26, 2008
    Inventors: Zhen Lai, Yuhua Tong, Christopher M. Wolfe, Chieh-Min Cheng
  • Patent number: 7390598
    Abstract: An imaging member includes a conductive substrate, a charge generating layer, a charge transport layer, and an intermediate layer between the charge generating layer and the charge transport layer, the intermediate layer including a hole transport material, such as three different hole transfer materials, dispersed in a film forming binder, such as two different binder materials.
    Type: Grant
    Filed: June 28, 2005
    Date of Patent: June 24, 2008
    Assignee: Xerox Corporation
    Inventors: Satchidanand Mishra, Yuhua Tong, Anthony M. Horgan, Kathleen M. Carmichael, Dennis J. Prosser, Richard L. Post, Edward F. Grabowski
  • Patent number: 7390601
    Abstract: A photoconductive imaging member is provided comprising a substrate, an optional hole blocking layer, a charge generation layer, and a charge transport layer. The charge generation layer includes a charge generating material and a binder, wherein the binder comprises an electron transport material chemically attached to a polymeric binder material.
    Type: Grant
    Filed: June 16, 2005
    Date of Patent: June 24, 2008
    Assignee: Xerox Corporation
    Inventors: Jin Wu, Yuhua Tong, Linda L. Ferrarese, John J. Wilbert, Edward C. Savage, Liang-Bih Lin
  • Publication number: 20080145781
    Abstract: An imaging member has a crosslinked overcoat layer which holds fluorinated nanoparticles. The overcoat layer is formed from an overcoat solution comprising a polymer binder; a hole transport molecule; fluorinated nanoparticles; a fluorinated surfactant; a crosslinking agent; and a free radical initiator. The overcoat layer provides excellent wear resistance at a low cost.
    Type: Application
    Filed: October 27, 2006
    Publication date: June 19, 2008
    Inventors: Yuhua Tong, Satchidanand Mishra, Anthony M. Horgan, Richard L. Post, Kathleen M. Carmichael, Edward F. Grabowski
  • Publication number: 20080138732
    Abstract: A toner having its surface functionalized with alkaline resins is provided, and processes for producing the same.
    Type: Application
    Filed: December 8, 2006
    Publication date: June 12, 2008
    Inventors: Zhen Lai, Yuhua Tong, Chieh-Min Cheng, Christopher M. Wolfe
  • Publication number: 20080138730
    Abstract: A toner having its surface functionalized with alkaline resins is provided, and processes for producing the same.
    Type: Application
    Filed: December 8, 2006
    Publication date: June 12, 2008
    Inventors: Zhen Lai, Yuhua Tong, Chieh-Min Cheng, Christopher M. Wolfe
  • Patent number: 7344809
    Abstract: An imaging member having a charge transport layer is provided. The charge transport layer includes a plurality of charge transport layers coated from solutions of similar or different compositions or concentrations, wherein the upper or additional transport layer(s) comprise a lower concentration of charge transport compound than the first (bottom) charge transport layer. The charge transport compound included in the first (bottom) charge transport layer may either be the same or different from that included in the additional charge transport layers. The charge transport compound in one or more of the layers is dissolved or molecularly dispersed in an electrically inactive polymer material to form a solid solution. In such a construction, the resulting charge transport layer exhibits enhanced cracking suppression, improves wear resistance, provides excellent imaging member electrical performance, and delivers improved print quality.
    Type: Grant
    Filed: November 16, 2006
    Date of Patent: March 18, 2008
    Assignee: Xerox Corporation
    Inventors: Anthony M. Horgan, Robert C. U. Yu, Satchidanand Mishra, Richard L. Post, Edward F. Grabowski, Kathleen M. Carmichael, John R. Lambie, Houy Jen Yuh, Timothy J. Fuller, John F. Yanus, Markus R. Silvestri, Yuhua Tong, Dale Renfer, Kenny-Tuan Tran Dinh, Geoffrey M.T. Foley
  • Publication number: 20080063965
    Abstract: A process for preparing a toner includes mixing a polymeric resin emulsion, a colorant dispersion, and a wax to form a mixture; optionally adding a coagulant to the mixture; heating the mixture at a temperature below a glass transition temperature of the polymeric resing to aggregate the polymeric resin, colorant, and wax, to form aggregated particles; and adding a coalescent agent to the aggregated particles; heating the aggregated particles and coalescent agent at a temperature above the glass transition temperature of the polymeric resin, to coalesce the aggregated particles to form toner particles, optionally cooling the mixture, and isolating the tone particles.
    Type: Application
    Filed: September 8, 2006
    Publication date: March 13, 2008
    Applicant: Xerox Corporation
    Inventors: Zhen Lai, Richard Fong, Yuhua Tong, Chieh-Min Cheng, Amy A. Grillo, Paul F. Smith, Paul J. Gerroir, Beng S. Ong
  • Patent number: 7341812
    Abstract: An imaging member having a substrate, an electroconducting layer having an electroconducting particle of a core and outer shell, an interfacial layer, and a charge transport layer with charge transport materials dispersed therein.
    Type: Grant
    Filed: April 14, 2005
    Date of Patent: March 11, 2008
    Assignee: Xerox Corporation
    Inventors: Jin Wu, Yuhua Tong, Geoffrey M T. Foley, Liang-Bih Lin, Jennifer Y. Hwang
  • Publication number: 20080057431
    Abstract: A toner having a core with a first latex having a specific glass transition temperature, and further having a shell surrounding the core with a second latex having a specific glass transition temperature and possessing functional groups, and processes for producing the same.
    Type: Application
    Filed: September 5, 2006
    Publication date: March 6, 2008
    Inventors: Zhen Lai, Yuhua Tong, Chieh-Min Cheng, Peter V. Nguyen, Jon T. Owens
  • Publication number: 20080057424
    Abstract: Disclosed herein is an electrophotographic imaging member comprising a substrate, a charge transport layer and an overcoat layer formed by combining a film forming binder and a hole transporting hydroxy triarylamine compound having at least one hydroxyl functional group that is linked to a ring carbon of an aryl group by an alkyl group having 1 to 12 carbon atoms and is capable of forming at least one of a chemical bond and a physical bond with the film forming binder. Also disclosed is an electrophotographic imaging member with an overcoat layer formed by combining a film forming polycarbonate binder, a hole transport material, a surface energy reducing silicone material comprising a crosslinkable acrylate monomer, and a solvent. Coatings and methods of forming imaging members also are disclosed.
    Type: Application
    Filed: August 31, 2006
    Publication date: March 6, 2008
    Inventors: Yuhua Tong, Cindy C. Chen, Susan M. VanDusen
  • Patent number: 7314694
    Abstract: An imaging member comprised of a hole blocking layer, a photogenerating layer, and a charge transport layer, and wherein the hole blocking layer is comprised of a metal alkyoxide, an amino siloxane, and at least one polymer binder containing epoxy groups.
    Type: Grant
    Filed: March 31, 2005
    Date of Patent: January 1, 2008
    Assignee: Xerox Corporation
    Inventors: Yuhua Tong, Nancy L. Belknap, John F. Yanus, Jin Wu
  • Publication number: 20070298340
    Abstract: Imaging members useful in electrostatographic apparatuses, including printers, copiers, other reproductive devices, and digital apparatuses. More particularly, imaging members having nano-sized particles serving as fillers dispersed or contained in one or more layers of the imaging member that provide for increased mechanical strength and improved wear.
    Type: Application
    Filed: June 22, 2006
    Publication date: December 27, 2007
    Applicant: Xerox Corporation
    Inventors: Satchidanand Mishra, Yuhua Tong, Kathleen Carmichael, Chieh-Min Cheng, Kenny-tuan Dinh, Susan Vandusen, Cindy Chen, Huoy-Jen Yuh, Lanhui Zhang
  • Publication number: 20070298110
    Abstract: Method for producing nanoparticles that can be used in a variety of applications, including improving performance of electrostatographic apparatuses. More particularly, a method for producing nanoparticles through a precipitation process occurring in a matrix of two or more molecules in a multi-solvent system.
    Type: Application
    Filed: June 22, 2006
    Publication date: December 27, 2007
    Applicant: Xerox Corporation
    Inventors: Satchidanand Mishra, Yuhua Tong, Anthony Horgan, Kathleen Carmichael
  • Patent number: 7312008
    Abstract: An imaging member includes a substrate, a charge generating layer, and a charge transport layer, wherein an external of the imaging member includes a polyhedral oligomeric silsesquioxane modified silicone dispersed therein.
    Type: Grant
    Filed: February 10, 2005
    Date of Patent: December 25, 2007
    Assignee: Xerox Corporation
    Inventors: Jin Wu, Yuhua Tong, John J. Wilbert, Liang-bih Lin, Jennifer Y. Hwang, Timothy J. O'Brien, Anthony Uttaro, Jr., Linda L. Ferrarese
  • Patent number: 7309551
    Abstract: An imaging member includes a substrate, a charge generating layer, a charge transport layer, and an outer overcoat layer including an electron conductive material.
    Type: Grant
    Filed: March 8, 2005
    Date of Patent: December 18, 2007
    Assignee: Xerox Corporation
    Inventors: Yuhua Tong, John F. Yanus, Anthony M. Horgan, T. Edwin Freeman, Jin Wu
  • Patent number: 7270927
    Abstract: A non-halogenated binder material, such as for an electrophotographic imaging member binder, includes a copolymer of vinyl acetate and vinyl acid.
    Type: Grant
    Filed: November 15, 2004
    Date of Patent: September 18, 2007
    Assignee: Xerox Corporation
    Inventors: Jin Wu, Francisco Lopez, Lanhui Zhang, Yuhua Tong, Liang-bih Lin, John S Chambers, Cindy Chen
  • Patent number: 7267917
    Abstract: A charge transport layer composition for a photoreceptor includes at least a binder, at least one arylamine charge transport material, e.g., N,N?-diphenyl-N,N?-bis(3-methylphenyl)-(1,1?-biphenyl)-4,4?-diamine, and at least one polymer containing carboxylic acid groups or groups capable of forming carboxylic acid groups. The charge transport layer forms a layer of photoreceptor, which also includes an optional anti-curl layer, a substrate, an optional hole blocking layer, an optional adhesive layer, a charge generating layer, and optionally one or more overcoat or protective layers.
    Type: Grant
    Filed: September 21, 2004
    Date of Patent: September 11, 2007
    Assignee: Xerox Corporation
    Inventors: Yuhua Tong, Kenny-Tuan T. Dinh, Markus R. Silvestri, Michael E. Zak, John F. Yanus, Min-Hong Fu, David M. Skinner, Kathleen M. Carmichael, Colleen A. Helbig, Dale S. Renfer, John A. Bergfjord, Sr., Susan M. Van Dusen, Anthony M. Horgan, Jin Wu, Steven M. Sterling
  • Publication number: 20070141489
    Abstract: An imaging member is disclosed which includes a charge generating layer and a charge transport layer. The charge transport layer includes a first charge transport layer adjacent the charge generating layer and at least a second charge transport layer adjacent the first charge transport layer. Each charge transport layer includes a film forming polymer binder and a charge transport material dispersed therein. The first charge transport material has a composition which is the same or different than the second charge transport material and of a lower concentration. It may be selected from an aryl amine, aryl diamine, or combinations thereof. The combination has the effect of reducing charge deficient spots.
    Type: Application
    Filed: December 21, 2005
    Publication date: June 21, 2007
    Inventors: Satchidanand Mishra, Kathleen Carmichael, Yuhua Tong, Anthony Horgan, Edward Grabowski, Richard Post, Susan VanDusen