Patents by Inventor Johann Junginger
Johann Junginger 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).
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Publication number: 20110014557Abstract: The presently disclosed embodiments relate generally to layers that are useful in imaging apparatus members and components, for use in electrophotographic, including digital, apparatuses. Embodiments pertain to an improved electrophotographic imaging member incorporating an outer layer having a nano- to micron-scale pattern imprinted into its surface to lower friction with the cleaning blade and improve print quality and performance. Embodiments also pertain to methods for making the improved imaging member.Type: ApplicationFiled: July 20, 2009Publication date: January 20, 2011Applicant: XEROX CORPORATIONInventors: Woo Soo Kim, Nan-Xing Hu, Yvan Gagnon, Johann Junginger
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Publication number: 20100253358Abstract: In the illustrated embodiment of the invention a scanning system is provided for scanning a chargeable surface for latent image detection. The chargeable surface is charged to a first potential, and a scanner probe is charged to a second potential within a predetermined potential difference from the first potential. The scanner probe is oscillated at a selected frequency and reads or measures the oscillation current that is induced from the oscillation and detects any latent images or other electrostatic distributions on the chargeable surface. A processor processes the probe measurements for determining the potential of a latent image on the chargeable surface based on the scanner probe readings.Type: ApplicationFiled: April 7, 2009Publication date: October 7, 2010Applicant: XEROX CORPORATIONInventors: Johann Junginger, Markus R. Silvestri
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Publication number: 20100221044Abstract: 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: ApplicationFiled: February 27, 2009Publication date: September 2, 2010Applicant: XEROX CORPORATIONInventors: Richard Klenkler, Ah-Mee Hor, Vladislav Skorokhod, Johann Junginger
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Publication number: 20100068636Abstract: 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: ApplicationFiled: November 27, 2007Publication date: March 18, 2010Applicant: XEROX CORPORATIONInventors: Hany AZIZ, Kathy L. DE JONG, Nan-Xing HU, Jennifer A. COGGAN, Johann JUNGINGER, Ah-Mee HOR
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Patent number: 7666560Abstract: An imaging member includes a charge generating layer and a charge transport layer. The charge transport layer includes a first surface in contact with the charge generating layer and a second surface. The charge transport layer includes a film forming polymer binder and a charge transport component dispersed therein. The concentration of the charge transport component in the charge transport layer is at a peak in a region of the charge transport intermediate the first and second surfaces of the charge transport layer.Type: GrantFiled: June 21, 2005Date of Patent: February 23, 2010Assignee: Xerox CorporationInventors: Satchidanand Mishra, Anthony M. Horgan, Kent Evans, George Liebermann, Kathleen M. Carmichael, Dennis J. Prosser, Richard L. Post, Edward Domm, Johann Junginger, Michael Zak
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Publication number: 20090326087Abstract: The presently disclosed embodiments are directed to a method for treating microcapsules for use in an improved imaging member, namely, in the overcoat layer. The overcoat layer is used for an imaging member having a substrate, a charge transport layer, and an overcoat positioned on the charge transport layer, and a method for making the overcoat layer using the treated microcapsules is provided.Type: ApplicationFiled: June 27, 2008Publication date: December 31, 2009Applicant: XEROX CORPORATIONInventors: Kathy De Jong, Yvan Gagnon, Johann Junginger, Vladislav Skorokhod, Darren Kazmaier, Naveen Chopra
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Patent number: 7622231Abstract: A photoconductor containing a photogenerating layer, at least one charge transport layer, and a layer in contact with the charge transport layer comprised of a suitable polymer, and wherein the charge transport layer comprises molecules of the formula/structure wherein X represents alkyl.Type: GrantFiled: August 30, 2006Date of Patent: November 24, 2009Assignee: Xerox CorporationInventors: Gregory McGuire, Jennifer A. Coggan, Johann Junginger, Nan-Xing Hu, Ah-Mee Hor
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Publication number: 20090197196Abstract: 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: ApplicationFiled: January 31, 2008Publication date: August 6, 2009Applicant: XEROX CORPORATIONInventors: Gregory McGuire, Jennifer A. Coggan, Johann Junginger, Nan-Xing Hu, Ah-Mee Hor
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Publication number: 20090186287Abstract: Disclosed is an electrophotographic photoreceptor having a protective overcoat layer including a polyol binder; a hole transport material; a curing agent; and a surface-treated tin oxide particle filler. Also disclosed is a process for forming a photoreceptor that includes providing a photoreceptor substrate; applying a charge generating layer; applying a charge transport layer; and applying a protective overcoating layer over the substrate; such that the protective overcoat layer includes a polyol binder; a hole transport material; a curing agent; and a surface-treated tin oxide particle filler. Also included is a method of forming an image, including the disclosed photoreceptor.Type: ApplicationFiled: January 23, 2008Publication date: July 23, 2009Applicant: XEROX CORPORATIONInventors: Kathy L. DE JONG, Yu QI, Vladislav SKOROKHOD, Nan-Xing HU, Johann JUNGINGER, Markus SILVESTRI, John F. YANUS, Kenny-Tuan DINH
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Patent number: 7553592Abstract: An electrophotographic imaging member includes at least one layer including a hole transport material and a strong electron acceptor material, such as an electrophotographic imaging member including a substrate, a charge generating layer, a hole transport layer, and an optional overcoating layer, wherein at least one layer of the electrophotographic imaging member comprises a strong electron acceptor material.Type: GrantFiled: June 5, 2006Date of Patent: June 30, 2009Assignee: Xerox CorporationInventors: Hany Aziz, Gregory McGuire, Johann Junginger
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Patent number: 7537873Abstract: Positive-charge injection-related ghosting of images in electrophotographic processes is addressed by electrophotographic photoreceptors that include a positive-charge injection preventing layer that includes one or more positive-charge-injection preventing compounds. In addition, processes are provided for preventing positive charge injection, in which the processes include a step of applying a positive-charge injection preventing composition to an electrophotographic photoreceptor in which the positive-charge injection preventing composition includes one or more positive-charge-injection preventing compound.Type: GrantFiled: November 6, 2006Date of Patent: May 26, 2009Assignee: Xerox CorporationInventors: John Graham, Zoran D. Popovic, Johann Junginger
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Publication number: 20080299474Abstract: A high quality hole transport material of a substituted biphenyl diamine, such as N,N,N?N?-tetra(4-methylphenyl)-(1,1?-biphenyl)-4,4?-diamine, where each X is independently selected from —H, alkyl(-CnH2n+1), where n is from 1 to about 10 such as from 1 to about 5 or from 1 to about 6, aralkyl and aryl groups, the aralkyl and aryl groups having, for example, from about 5 to about 30, such as about 6 to about 20 carbon atoms, where the purity of the hole transport material is from about 80 percent to about 100 percent, and when incorporated into a photoreceptor, the photoreceptor discharges 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 ergs/cm2 to about, 5 ergs/cm2. Also disclosed is a photoreceptor containing the same.Type: ApplicationFiled: May 31, 2007Publication date: December 4, 2008Applicant: XEROX CORPORATIONInventors: Gregory MCGUIRE, Jennifer A. COGGAN, Hany AZIZ, Johann JUNGINGER, Nan-Xing HU, Ah-Mee Hor
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Publication number: 20080299472Abstract: 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: ApplicationFiled: May 31, 2007Publication date: December 4, 2008Inventors: Kathy L. DeJong, Nan-Xing Hu, Hany Aziz, Jennifer A. Coggan, Johann Junginger, Ah-Mee Hor, John F. Yanus, Kenny-Tuan Dinh
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Publication number: 20080107981Abstract: Positive-charge injection-related ghosting of images in electrophotographic processes is addressed by electrophotographic photoreceptors that include a positive-charge injection preventing layer that includes one or more positive-charge-injection preventing compounds. In addition, processes are provided for preventing positive charge injection, in which the processes include a step of applying a positive-charge injection preventing composition to an electrophotographic photoreceptor in which the positive-charge injection preventing composition includes one or more positive-charge-injection preventing compound.Type: ApplicationFiled: November 6, 2006Publication date: May 8, 2008Applicant: XEROX CORPORATIONInventors: John Graham, Zoran D. Popovic, Johann Junginger
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Publication number: 20080102388Abstract: 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 form 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: ApplicationFiled: May 31, 2007Publication date: May 1, 2008Applicant: XEROX CORPORATIONInventors: Hany Aziz, Gregory McGuire, Jennifer A. Coggan, Johann Junginger, Kathy L. De Jong, Ah-Mee Hor, Nan-Xing HU
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Publication number: 20080057426Abstract: A photoconductor containing a photogenerating layer, at least one charge transport layer, and a layer in contact with the charge transport layer comprised of a suitable polymer, and wherein the charge transport layer comprises molecules of the formula/structure wherein X represents alkyl.Type: ApplicationFiled: August 30, 2006Publication date: March 6, 2008Inventors: Gregory McGuire, Jennifer A. Coggan, Johann Junginger, Nan-Xing Hu, Ah-Mee Hor
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Publication number: 20070281226Abstract: An electrophotographic imaging member includes at least one layer including a hole transport material and a strong electron acceptor material, such as an electro photographic imaging member including a substrate, a charge generating layer, a hole transport layer, and an optional overcoating layer, wherein at least one layer of the electrophotographic imaging member comprises a strong electron acceptor material.Type: ApplicationFiled: June 5, 2006Publication date: December 6, 2007Applicant: XEROX CORPORATIONInventors: Hany AZIZ, Gregory McGuire, Johann Junginger
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Publication number: 20070092817Abstract: An imaging member having an overcoat layer formed from a high viscosity overcoat composition. The viscosity of the overcoat composition is sufficient for reducing or preventing the diffusion of charge transport molecules into the overcoat layer. For example, in one embodiment the magnitude of diffusion of charge transport molecules is controlled by the viscosity of the overcoat composition used to form the overcoat layer. Other embodiments are also disclosed.Type: ApplicationFiled: October 25, 2005Publication date: April 26, 2007Inventors: Greg McGuire, John Graham, Zoran Popovic, Ah-Mee Hor, Stephan Drappel, Johann Junginger
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Publication number: 20070080693Abstract: A method for detecting charge defect spots (CDSs) on a chargeable surface is provided, including charging the chargeable surface to receive and hold a first voltage charge, spacing a surface of a scanner probe a distance from the chargeable surface, the scanner probe having a diameter, and biasing the scanner probe to a second voltage charge within a predetermined voltage threshold of the first voltage charge, wherein a parallel plate capacitor is established with the chargeable surface and a dielectric substance between the scanner probe and the chargeable surface.Type: ApplicationFiled: October 11, 2005Publication date: April 12, 2007Inventors: Johann Junginger, Zoran Popovic, Surendar Jeyadev
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Publication number: 20060286471Abstract: An imaging member includes a charge generating layer and a charge transport layer. The charge transport layer includes a first surface in contact with the charge generating layer and a second surface. The charge transport layer includes a film forming polymer binder and a charge transport component dispersed therein. The concentration of the charge transport component in the charge transport layer is at a peak in a region of the charge transport intermediate the first and second surfaces of the charge transport layer.Type: ApplicationFiled: June 21, 2005Publication date: December 21, 2006Inventors: Satchidanand Mishra, Anthony Horgan, Kent Evans, George Liebermann, Kathleen Carmichael, Dennis Prosser, Richard Post, Edward Domm, Johann Junginger, Michael Zak