Patents by Inventor Robert C. U. Yu

Robert C. U. Yu 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).

  • Publication number: 20090253056
    Abstract: Present embodiments pertain to an improved electrostatographic imaging member having low contact friction surfaces to ease sliding mechanical interaction and suppressing abrasion/wear failure and methods of preparing thereof. The improved imaging member has layers comprising slippery polyhedral oligomeric silsequioxane molecules that enhance the physical and mechanical functions and reduce the layers surface contact friction of the imaging member to extend service life.
    Type: Application
    Filed: April 7, 2008
    Publication date: October 8, 2009
    Applicant: XEROX CORPORATION
    Inventor: Robert C. U. Yu
  • Publication number: 20090253059
    Abstract: Present embodiments pertain to an improved electrostatographic imaging member having low contact friction surfaces to ease sliding mechanical interaction and suppressing abrasion/wear failure and methods of preparing thereof. The improved imaging member has layers comprising one or two low surface energy polymeric materials that enhance the physical and mechanical functions and reduce the layers surface contact friction of the imaging member to extend service life.
    Type: Application
    Filed: April 7, 2008
    Publication date: October 8, 2009
    Applicant: XEROX CORPORATION
    Inventors: Robert C. U. Yu, Edward F. Grabowski, Kathleen M. Carmichael, Stephen T. Avery, Satish Parikh
  • Publication number: 20090253060
    Abstract: Present embodiments pertain to an improved electrostatographic imaging member having low contact friction surfaces to ease sliding mechanical interaction and suppressing abrasion/wear failure and methods of preparing thereof. The improved imaging member has layers comprising slippery polyhedral oligomeric silsequioxane molecules that enhance the physical and mechanical functions and reduce the layers surface contact friction of the imaging member to extend service life.
    Type: Application
    Filed: April 7, 2008
    Publication date: October 8, 2009
    Applicant: XEROX CORPORATION
    Inventor: Robert C. U. Yu
  • Patent number: 7592111
    Abstract: An electrostatographic imaging member formulated with a liquid carbonate is provided. The imaging electrostatographic member exhibits improved service life.
    Type: Grant
    Filed: November 5, 2004
    Date of Patent: September 22, 2009
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Satchidanand Mishra, Anthony M. Horgan, Richard L. Post, Yuhua Tong, Edward F. Grabowski, Kathleen M. Carmichael, Markus R. Silvestri
  • Patent number: 7541122
    Abstract: A photoconductor containing an optional supporting substrate, a photogenerating layer, and at least one silanol containing charge transport layer.
    Type: Grant
    Filed: July 12, 2006
    Date of Patent: June 2, 2009
    Assignee: Xerox Corporation
    Inventors: Jin Wu, Kenny-Tuan Dinh, Kathleen M. Carmichael, Susan M. Vandusen, Liang-Bih Lin, Michael S. Roetker, Robert C. U. Yu
  • Patent number: 7541123
    Abstract: An imaging member includes an electrically conductive layer; a positive charge blocking layer, an imaging layer, and an undercoat layer. The undercoat layer is intermediate the imaging layer and the electrically conductive layer. The undercoat layer includes a film forming polymer and a particulate material dispersed therein. The particulate material supports a charge blocking material thereon.
    Type: Grant
    Filed: June 20, 2005
    Date of Patent: June 2, 2009
    Assignee: Xerox Corporation
    Inventors: Satchidanand Mishra, Robert C. U. Yu, Kathleen M. Carmichael
  • Patent number: 7527905
    Abstract: An imaging member comprising a charge generating layer, a charge transport layers and an optional barrier layer between the charge generating layer and the charge transport layer. The charge transport layer may comprise a first and a second or more layers, wherein the first layer comprises a film-forming polymer having hole-transporting capability, but does not contain charge transport molecules. The barrier layer and/or the first charge transport layer reduces or prevents the buildup of charge transport molecules along the surface of the charge generating layer to thereby suppress the development of charge-deficient spots (CDS) defects in the imaging print-out copies from the imaging member.
    Type: Grant
    Filed: June 20, 2006
    Date of Patent: May 5, 2009
    Assignee: Xerox Corporation
    Inventor: Robert C. U. Yu
  • Patent number: 7527906
    Abstract: The presently disclosed embodiments are directed to anticurl back coatings useful in electrostatography. More particularly, the embodiments pertain to an electrophotographic imaging member with an improved anticurl back coating formulated by a polymer blend comprising two low surface energy polymeric materials that prevents curling, renders surface lubricity, eliminates electrostatic charge buildup, reduces surface contact friction, and enhances abrasion/wear resistance, and a process for making and using the imaging member.
    Type: Grant
    Filed: June 20, 2006
    Date of Patent: May 5, 2009
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Stephen T. Avery, Edward F. Grabowski, Satish Parikh, Donald J. Goodman
  • Patent number: 7504187
    Abstract: The presently disclosed embodiments relate in general to electrophotographic imaging members, such as layered photoreceptor structures, and processes for making and using the same. More particularly, the embodiments pertain to an improved electrophotographic imaging member having a protective overcoat layer comprising a low surface energy polymeric material to enhance the imaging member physical/mechanical function as well as render its service life extension and a process for making and using the member.
    Type: Grant
    Filed: July 28, 2006
    Date of Patent: March 17, 2009
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Stephen T. Avery, Kathleen M. Carmichael
  • Patent number: 7462434
    Abstract: An imaging member having an anti-curl back coating is disclosed. The anti-curl back coating comprises a low surface energy polymer having siloxane segments in its backbone and a film forming polymer. The anti-curl back coating has low surface energy and improved surface lubricity.
    Type: Grant
    Filed: December 21, 2005
    Date of Patent: December 9, 2008
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Stephen T. Avery
  • Patent number: 7459251
    Abstract: An imaging member comprising a barrier or under-layer intermediate a photogenerating layer and charge transport layer to reduce charge deficiency spots. The barrier under-layer comprises a film forming polymer binder selected from a conductive polymer binder, a non-conductive polymer binder, or mixtures thereof. Optionally, the barrier layer can include a small amount of a charge transport material.
    Type: Grant
    Filed: December 21, 2005
    Date of Patent: December 2, 2008
    Assignee: Xerox Corporation
    Inventors: Satchidanand Mishra, Kathleen M. Carmichael, Yuhua Tong, Anthony M. Horgan, Edward F. Grabowski, Richard L. Post, Robert C. U. Yu, Dennis J. Prosser, Edward Domm, Min-Hong Fu
  • Patent number: 7455802
    Abstract: A stress/strain relief process for a flexible, multilayered web stock includes providing a multilayered web stock including at least one layer to be treated, the at least one layer to be treated having a coefficient of thermal expansion significantly differing from a coefficient of thermal expansion of another layer; passing the multilayered web stock over and in contact with a first wrinkle-reducing roller that spontaneously creates transverse tension stress in the at least one layer to be treated; heating at least the at least one layer to be treated above a glass transition temperature Tg of the at least one layer to be treated to thereby create a heated portion of the at least one layer to be treated, a portion of the web stock in proximity to the heated portion of the at least one layer to be treated thereby becoming a heated portion of the web stock; inducing curvature in the heated portion of the web stock; and cooling the heated portion of the web stock at said curvature.
    Type: Grant
    Filed: December 23, 2003
    Date of Patent: November 25, 2008
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, John J. Darcy, Michael S. Roetker, Scott Griffin, Felix J. Santana, Satchidanand Mishra
  • Patent number: 7455941
    Abstract: An imaging member having an anti-curl back coating comprising an inner layer and an outer layer is disclosed. The outer layer comprises a low surface energy polymer having siloxane segments in its backbone and the inner layer comprises a film forming polymer. The anti-curl back coating has low surface energy and improved surface lubricity.
    Type: Grant
    Filed: December 21, 2005
    Date of Patent: November 25, 2008
    Assignee: Xerox Corporation
    Inventors: Kent J. Evans, Robert C. U. Yu, Stephen T. Avery
  • Publication number: 20080247779
    Abstract: This is a specifically configured roller used in a belt transport system that minimizes ripples or wrinkles in the belt. Based upon a roller having a cylindrical configuration and a one inch diameter, the roller has a concave shape having a 0.005 to 0.1 inch smaller diameter in the center compared to the end portion diameters.
    Type: Application
    Filed: April 3, 2007
    Publication date: October 9, 2008
    Inventors: Michael Roetker, Robert C.U. Yu
  • Publication number: 20080241721
    Abstract: A photoconductor containing a first layer, a supporting substrate thereover, a photogenerating layer, and at least one charge transport layer comprised of at least one charge transport component, and wherein the first layer is in contact with the supporting substrate on the reverse side thereof, and which layer contains a semi-penetrating polymer network formed from crosslinking a suitable fluoropolymer, and within which network structure is penetrated with a polycarbonate.
    Type: Application
    Filed: March 29, 2007
    Publication date: October 2, 2008
    Inventors: Huoy-Jen Yuh, Robert C U Yu, Yuhua Tong, David M. Skinner
  • Patent number: 7422831
    Abstract: The presently disclosed embodiments are directed to anticurl back coatings useful in electrophotography. More particularly, the embodiments pertain to an electrophotographic imaging member with an improved anticurl back coating including a low surface energy polymeric material to prevent curling, render surface lubricity, eliminate electrostatic charge built-up, and reduce friction, and a process for making and using the member.
    Type: Grant
    Filed: September 15, 2005
    Date of Patent: September 9, 2008
    Assignee: Xerox Corporation
    Inventor: Robert C. U. Yu
  • Publication number: 20080202369
    Abstract: An image development method implemented on a substrate conditioning unit for the drying and compression of a print in an electrophotographic imaging process. The conditioning unit includes a heating mechanism for maintaining the heat of compression rollers, belts or nip rollers for compressing the substrate by a determined distance between the conditioning rollers, or by direct contact between a compression roller and a nip roller, and having an abhesive layer to prevent adhesion of the conditioning unit to the print substrate.
    Type: Application
    Filed: February 23, 2007
    Publication date: August 28, 2008
    Applicant: XEROX CORPORATION
    Inventors: Robert C.U. YU, Jimmy E. KELLY, Stephen T. AVERY
  • Patent number: 7413835
    Abstract: An electrophotographic imaging member having a thermoplastic charge transport layer comprising a charge transport compound, a polycarbonate polymer binder, a particulate dispersion, and a high boiler compatible organic liquid. The disclosed charge transport layer exhibits enhanced wear resistance, excellent photoelectrical properties, and good print quality.
    Type: Grant
    Filed: July 14, 2005
    Date of Patent: August 19, 2008
    Assignee: Xerox Corporation
    Inventors: Liang-Bih Lin, Robert C. U. Yu, Francisco Lopez, Jin Wu, John S. Chambers
  • Patent number: 7377416
    Abstract: In ultrasonic welding of a seam, such as for creation of an imaging belt, an ultrasonic welding horn is applied to an overlap area. The welding horn has a contact surface within a certain set of dimensions comparable to the overlap area. The welding horn defines a conical main body that tapers to the dimensions of the contact area through a short length.
    Type: Grant
    Filed: October 1, 2004
    Date of Patent: May 27, 2008
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Michael S. Roetker, David W. Martin
  • 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