Patents by Inventor Ah-Mee Hor

Ah-Mee Hor 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: 8148039
    Abstract: An aromatic silicon-containing compound has the formula: Ar—[X-L-SiRn(OR?)3-n]m where Ar represents an aromatic group, X represents a divalent or trivalent group; L represents a divalent linking group; R represents a hydrogen atom, an alkyl group or an aryl group; R? represents an alkyl group having 1 to 5 carbon atoms; n is an integer of from 0 to 2; and m is an integer of from 1 to 5. The aromatic silicon-containing compound can be used in electrophotographic photoreceptors, particularly in outmost protective layers of such electrophotographic photoreceptors.
    Type: Grant
    Filed: September 14, 2009
    Date of Patent: April 3, 2012
    Assignee: Xerox Corporation
    Inventors: Yu Qi, Nan-Xing Hu, John F. Graham, Timothy P. Bender, Ah-Mee Hor, Yvan Gagnon, Cheng-Kuo Hsiao
  • Patent number: 8057974
    Abstract: Disclosed is an imaging member comprising a conductive substrate, a photogenerating layer comprising a photogenerating material in contact with the substrate, and a charge transport layer in contact with the photogenerating layer, the charge transport layer comprising a charge transport material, a polymer containing carboxylic acid groups or groups capable of forming carboxylic acid groups, and a hydroquinone antioxidant, wherein the photogenerating layer is situated between the charge transport layer and the conductive substrate.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: November 15, 2011
    Assignee: Xerox Corporation
    Inventors: Gregory McGuire, Ah-Mee Hor
  • Patent number: 8043784
    Abstract: The presently disclosed embodiments are directed to charge transport layers useful in electrostatography. More particularly, the embodiments pertain to an improved imaging member having a charge transport layer comprising a top layer and a bottom layer, wherein the layers have varying concentrations of high quality N,N,N?N?-tetra(4-methylphenyl)-(1,1?-biphenyl)-4,4?-diamine to provide tunable discharge rate.
    Type: Grant
    Filed: January 31, 2008
    Date of Patent: October 25, 2011
    Assignee: Xerox Corporation
    Inventors: Gregory McGuire, Jennifer A. Coggan, Johann Junginger, Nan-Xing Hu, Ah-Mee Hor
  • Patent number: 8029958
    Abstract: The presently disclosed embodiments are directed to an improved low wear overcoat for an imaging member having a substrate, a charge transport layer, and an overcoat layer positioned on the charge transport layer, and a process for preparing the same, where the overcoat layer includes an aromatic polyol binder, a hole transport molecule, and a melamine formaldehyde curing resin.
    Type: Grant
    Filed: July 16, 2008
    Date of Patent: October 4, 2011
    Assignee: Xerox Corporation
    Inventors: Yu Qi, Nan-Xing Hu, Vladislav Skorokhod, Yvan Gagnon, Ah-Mee Hor
  • Patent number: 8029956
    Abstract: An electrophotographic imaging member includes a substrate, a charge generating layer, a charge transport layer, and an overcoating layer, the overcoating layer being a cured film formed from a film forming resin composition including at least a melamine compound, a polyol, and a charge transport compound, where the charge transport compound is represented by: QL-OH]n. where Q represents a charge transport component, L represents a divalent linkage group, and represents a number of repeating segments or groups.
    Type: Grant
    Filed: January 13, 2006
    Date of Patent: October 4, 2011
    Assignee: Xerox Corporation
    Inventors: Yu Qi, Hany Aziz, Nan-Xing Hu, Ah-Mee Hor, Kenny-Tuan Dinh, John F Yanus
  • Patent number: 8032059
    Abstract: The presently disclosed embodiments are directed to charging devices which produce a negative corona. The present embodiments pertain to the use of a positive charging device, such as a scorotron, after the erase lamp and before negative charging station in the xerographic cyclic to mitigate the undesirable changes in charge transport layer electrical properties that result from exposure to corona while negatively charging the photoreceptor during latent image formation.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: October 4, 2011
    Assignee: Xerox Corporation
    Inventors: Richard Klenkler, Ah-Mee Hor, Vladislav Skorokhod, Johann Junginger
  • Patent number: 8012655
    Abstract: The presently disclosed embodiments are directed to an imaging member having an outermost layer formulation that includes wax particles which creates a rough surface morphology for the layer and imparts increased scratch resistance, reduced torque, and improved cleaning performance to the layer. In embodiments, the outermost layer is an overcoat layer used for an improved imaging member having a substrate, a charge transport layer, and an overcoat positioned on the charge transport layer.
    Type: Grant
    Filed: April 22, 2008
    Date of Patent: September 6, 2011
    Assignee: Xerox Corporation
    Inventors: Kathy L. De Jong, Nan-Xing Hu, Yvan Gagnon, Yu Qi, Ah-Mee Hor, Cuong Vong, Vladislav Skorokhod
  • Patent number: 7960082
    Abstract: Disclosed is an electrophotographic imaging member including a substrate; a charge generating layer; a charge transport layer with a hole transport material; and a protective overcoat layer having a silicone polyether additive with at least one carbinol function group; a polyol binder; a hole transport material; a curing agent; and an acid catalyst.
    Type: Grant
    Filed: November 27, 2007
    Date of Patent: June 14, 2011
    Assignee: Xerox Corporation
    Inventors: Hany Aziz, Kathy L. De Jong, Nan-Xing Hu, Jennifer A. Coggan, Johann Junginger, Ah-Mee Hor
  • Patent number: 7947417
    Abstract: A process for preparing a high sensitivity titanyl phthalocyanine (TiOPc) pigment includes dissolving a Type I TiOPc in a suitable solvent, precipitating an intermediate TiOPc pigment by quenching the solution comprising the dissolved Type I TiOPc in a solvent system comprising an alcohol and alkylene chloride such as, for example, methylene chloride, and treating the intermediate TiOPc pigment with monochlorobenzene. The resultant TiOPc pigment, which is designated as a Type V TiOPc, is suitable for use as a charge generating material in a photoreceptor of an imaging device.
    Type: Grant
    Filed: November 18, 2004
    Date of Patent: May 24, 2011
    Assignee: Xerox Corporation
    Inventors: Jin Wu, Liang-Bih Lin, Ah-Mee Hor, Roger E. Gaynor, Justin F. Galloway
  • Patent number: 7943276
    Abstract: Disclosed is an imaging member comprising a conductive substrate, a photogenerating layer comprising a photogenerating material in contact with the substrate, and a charge transport layer in contact with the photogenerating layer, the charge transport layer comprising a charge transport material, an organic phosphite or organic phosphonite antioxidant, and a hydroquinone antioxidant, wherein the photogenerating layer is situated between the charge transport layer and the conductive substrate.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: May 17, 2011
    Assignee: Xerox Corporation
    Inventors: Gregory McGuire, Ah-Mee Hor
  • Patent number: 7932006
    Abstract: A coating composition that contains a mixture of an alkyl alcohol, a glycol monoether, a charge transport component, a crosslinking component, and at least one hydroxyl containing polymer, and a photoconductor thereof with a supporting substrate, a photogenerating layer, and at least one charge transport layer, and an overcoating layer in contact with and contiguous to the charge transport layer, and which overcoating is comprised of a mixture of an alkyl alcohol, a glycol monoether, an acrylated polyol, a polyalkylene glycol, a crosslinking component, and a charge transport component.
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: April 26, 2011
    Assignee: Xerox Corporation
    Inventors: Kathy L. Dejong, Nan-Xing Hu, Hany Aziz, Jennifer A. Coggan, Johann Junginger, Ah-Mee Hor, John F. Yanus, Kenny-Tuan Dinh
  • Patent number: 7879518
    Abstract: Disclosed is a photoreceptor including a substrate, a charge generating layer, and a charge transport layer having a tertiary aryl amine charge transport molecule represented by the following general formula in which Ar1, Ar2, Ar3, Ar4 and Ar5 each independently represents a substituted or unsubstituted aryl group, or Ar5 independently represents a substituted or unsubstituted arylene group, and k represents 0 or 1, and in which at least two of Ar1, Ar2, Ar3 and Ar4 includes a hydroxymethyl group or an alkoxymethyl group having from 1 to about 6 carbon atoms, having an oxidation potential of from about 0.75 V to about 1.0 V as measured vs. Ag/AgCl in 0.1 M tetra-n-butylammonium perchlorate in dichloromethane, and an antioxidant capable of reacting with the charge transport molecule. Disclose is also a process for forming the photoreceptors described herein and a method of forming an image with the photoreceptors described herein.
    Type: Grant
    Filed: November 20, 2007
    Date of Patent: February 1, 2011
    Assignee: Xerox Corporation
    Inventors: Jennifer A. Coggan, Gregory McGuire, Nan-Xing Hu, Ah-Mee Hor
  • Patent number: 7875411
    Abstract: A photoreceptor with a substrate, a charge generating layer, a charge transport layer including N,N,N?N?-tetra(4-methylphenyl)-(1,1?-biphenyl)-4,4?-diamine, having a purity of from about 95 percent to about 100 percent, and a protective overcoating layer, optionally including a hole transport material other than N,N,N?N?-tetra(4-methylphenyl)-(1,1?-biphenyl)-4,4?-diamine, that will discharge from about 85% to about 100% of its surface potential in from 0 to about 40 milliseconds upon being subjected to xerographic charging and exposure to radiant energy of from about 1 erg/cm2 to about 5 ergs/cm2.
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: January 25, 2011
    Assignee: Xerox Corporation
    Inventors: Hany Aziz, Gregory McGuire, Jennifer A. Coggan, Johann Junginger, Kathy L. De Jong, Ah-Mee Hor, Nan-Xing Hu
  • Publication number: 20110014556
    Abstract: The disclosed embodiments are directed to electrophotographic photoreceptors imaging members. More particularly, the imaging members of this disclosure comprise a charge transport layer comprising a charge transport molecule and a charge stabilizing compound to suppress the effects of corona effluents and provide stabilized charge acceptance during prolonged cycling, thereby improving print quality.
    Type: Application
    Filed: July 20, 2009
    Publication date: January 20, 2011
    Applicant: XEROX CORPORATION
    Inventors: Gregory McGuire, Ah-mee Hor
  • Patent number: 7811730
    Abstract: Disclosed is an imaging member comprising a conductive substrate, a photogenerating layer comprising a photogenerating material in contact with the substrate, a first charge transport layer in contact with the photogenerating layer, the first charge transport layer comprising a charge transport material and an organic phosphate or organic phosphonite antioxidant, and a second charge transport layer in contact with the first charge transport layer, the second charge transport layer comprising a charge transport material and a hydroquinone antioxidant, wherein the first charge transport layer is situated between the second charge transport layer and the photogenerating layer.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: October 12, 2010
    Assignee: Xerox Corporation
    Inventors: Gregory McGuire, Ah-Mee Hor
  • Patent number: 7811729
    Abstract: Disclosed is an imaging member comprising a conductive substrate, a photogenerating layer comprising a photogenerating material in contact with the substrate, a first charge transport layer in contact with the photogenerating layer, the first charge transport layer comprising a charge transport material and a polymer containing carboxylic acid groups or groups capable of forming carboxylic acid groups, and a second charge transport layer in contact with the first charge transport layer, the second charge transport layer comprising a charge transport material and a hydroquinone antioxidant, wherein the first charge transport layer is situated between the second charge transport layer and the photogenerating layer.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: October 12, 2010
    Assignee: Xerox Corporation
    Inventors: Gregory McGuire, Ah-Mee Hor
  • Patent number: 7807324
    Abstract: An imaging member containing an optional supporting substrate, a photogenerating layer, a charge transport layer, and an overcoat layer comprised, for example, of a phenolic resin containing a phenolic charge transport component.
    Type: Grant
    Filed: September 15, 2006
    Date of Patent: October 5, 2010
    Assignee: Xerox Corporation
    Inventors: Nan-Xing Hu, Yvan Gagnon, Ah-Mee Hor
  • Patent number: 7795462
    Abstract: An aromatic silicon-containing compound has the formula: Ar—[X-L-SiRn(OR?)3-n]m where Ar represents an aromatic group, X represents a divalent or trivalent group; L represents a divalent linking group; R represents a hydrogen atom, an alkyl group or an aryl group; R? represents an alkyl group having 1 to 5 carbon atoms; n is an integer of from 0 to 2; and m is an integer of from 1 to 5. The aromatic silicon-containing compound can be used in electrophotographic photoreceptors, particularly in outmost protective layers of such electrophotographic photoreceptors.
    Type: Grant
    Filed: January 13, 2005
    Date of Patent: September 14, 2010
    Assignee: Xerox Corporation
    Inventors: Yu Qi, Nan-Xing Hu, John F. Graham, Timothy P. Bender, Ah-Mee Hor, Yvan Gagnon, Cheng-Kuo Hsiao
  • Publication number: 20100221044
    Abstract: The presently disclosed embodiments are directed to charging devices which produce a negative corona. The present embodiments pertain to the use of a positive charging device, such as a scorotron, after the erase lamp and before negative charging station in the xerographic cyclic to mitigate the undesirable changes in charge transport layer electrical properties that result from exposure to corona while negatively charging the photoreceptor during latent image formation.
    Type: Application
    Filed: February 27, 2009
    Publication date: September 2, 2010
    Applicant: XEROX CORPORATION
    Inventors: Richard Klenkler, Ah-Mee Hor, Vladislav Skorokhod, Johann Junginger
  • Patent number: 7771909
    Abstract: A photoconductor that includes a photogenerating layer, and at least one charge transport layer where the photogenerating layer contains a titanyl phthalocyanine prepared, for example, by dissolving a Type I titanyl phthalocyanine in a solution comprising a trihaloacetic acid and an alkylene halide; adding the resulting mixture of the dissolved Type I titanyl phthalocyanine to a solution of an alcohol and an alkylene halide thereby precipitating a Type Y titanyl phthalocyanine; and treating the Type Y titanyl phthalocyanine with a monohalobenzene, and wherein the photogenerating layer is prepared from a dispersion of the titanyl phthalocyanine Type V and a chlorinated solvent of at least one of a dichloroethane and a dichloropropane.
    Type: Grant
    Filed: November 20, 2006
    Date of Patent: August 10, 2010
    Assignee: Xerox Corporation
    Inventors: Cuong Vong, Ah-Mee Hor