Patents by Inventor Zoran D. Popovic
Zoran D. Popovic 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: 20020180349Abstract: A display device composed of: (a) a cathode; (b) an anode; (c) a luminescent region between the cathode and the anode; and an optional region adjacent one of the electrodes, wherein at least one of the cathode, the anode, the luminescent region, and the optional region includes a metal-organic mixed layer composed of: (i) an inorganic metal containing material, (ii) an organic material, and (iii) optionally, at least one component selected from the group consisting of metals, organic materials, and inorganic materials.Type: ApplicationFiled: April 5, 2002Publication date: December 5, 2002Applicant: Xerox CorporationInventors: Hany Aziz, Yoon-Fei Liew, Zoran D. Popovic, Nan-Xing Hu, Anthony J. Paine
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Patent number: 6479172Abstract: An electroluminescent device containing an anode, an organic electroluminescent element, and a cathode wherein the electroluminescent element contains, for example, a fluorescent hydrocarbon component of Formula (I) wherein R1 and R2 are substituents, which are selected from the group consisting of hydrogen, an alkyl, an alicyclic alkyl, an alkoxy, a halogen, and a cyano; Ar1 and Ar2 are each independently an aromatic component or an aryl group comprised of a from about 4 to about 15 conjugate-bonded or fused benzene rings.Type: GrantFiled: January 26, 2001Date of Patent: November 12, 2002Assignee: Xerox CorporationInventors: Nan-Xing Hu, Hany Aziz, Poonam Jain, Zoran D. Popovic
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Publication number: 20020145380Abstract: An organic light emitting device containingType: ApplicationFiled: January 26, 2001Publication date: October 10, 2002Applicant: Xerox CorporationInventors: Hany Aziz, Zoran D. Popovic, Nan-Xing Hu
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Publication number: 20020135296Abstract: An organic light emitting device containingType: ApplicationFiled: January 26, 2001Publication date: September 26, 2002Applicant: Xerox CorporationInventors: Hany Aziz, Zoran D. Popovic, Nan-Xing Hu
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Publication number: 20020132134Abstract: An electroluminescent device containing an anode, an organic electroluminescent element, and a cathode wherein the electroluminescent element contains, for example, a fluorescent hydrocarbon component of Formula (I) 1Type: ApplicationFiled: January 26, 2001Publication date: September 19, 2002Applicant: Xerox CorporationInventors: Nan-Xing Hu, Hany Aziz, Poonam Jain, Zoran D. Popovic
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Patent number: 6392339Abstract: An organic light emitting device includes a mixed region composed of a mixture of a hole transport material and an electron transport material, one of which is an emitter. The organic light emitting device also includes at least one of a hole transport material region and an electron transport material region on the mixed region. An anode contacts the hole transport material region or the mixed region. A cathode contacts the electron transport material region or the mixed region. The hole transport material region and/or the electron transfer material region can be formed with a plurality of layers.Type: GrantFiled: July 20, 1999Date of Patent: May 21, 2002Assignee: Xerox CorporationInventors: Hany M. Aziz, Zoran D. Popovic, Nan-Xing Hu, Ah-Mee Hor
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Patent number: 6392250Abstract: An organic light emitting device includes a mixed region composed of a mixture of a hole transport material, an electron transport material and at least one dopant material. The hole transport material and/or the electron transport material can optionally be an emitter. The materials of the mixed region can be selected to provide various emission colors from the organic light emitting device. The organic light emitting device also includes at least one of a hole transport material region and an electron transport material region on the mixed region. The hole transport material region, the electron transfer material region, and/or the mixed region can be formed with a plurality of layers.Type: GrantFiled: June 30, 2000Date of Patent: May 21, 2002Assignee: Xerox CorporationInventors: Hany M. Aziz, Zoran D. Popovic, Nan-Xing Hu
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Patent number: 6229012Abstract: A triazine compound of the formula wherein Ar1, Ar2, Ar3, and Ar4 are each an aryl, aliphatic, or a mixture of aryl and aliphatic; R1 and R2 are selected from the group consisting of hydrogen, alkyl, aryl, alkoxy, halogen, and cyano; and L is L(n) wherein n is zero or 1, said L being a divalent group.Type: GrantFiled: January 21, 2000Date of Patent: May 8, 2001Assignee: Xerox CorporationInventors: Nan-Xing Hu, Zoran D. Popovic, Beng S. Ong, Hany Aziz
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Patent number: 6225467Abstract: The triazine wherein Ar1, Ar2, Ar3, and Ar4 are each independently an aryl; R1 and R2 are substituents selected from the group consisting of hydrogen, an alkyl, an aryl, an alkoxy, a halogen atom, and a cyano; R3 and R4 are each a divalent group L selected from the group consisting of —C(R′R″)—, alkylene, an oxygen atom, a sulfur atom, and —Si(R′R″)—, wherein R′ and R″ are selected from the group consisting of hydrogen, alkyl, alkoxy, and aryl.Type: GrantFiled: January 21, 2000Date of Patent: May 1, 2001Assignee: Xerox CorporationInventors: Mohammad Esteghamatian, Nan-Xing Hu, Zoran D. Popovic, Ah-Mee Hor, Beng S. Ong
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Patent number: 6160273Abstract: A OLED-based edge emitter mitigates the problem of unacceptably large losses by physically separating the OLED from the waveguide using an optical cladding layer. An additional advantage over conventional surface emitting OLEDs used in image bars is the pixel aspect ratio of the edge emitter. The pixel-aspect ratio is narrow in the process direction forming a rectangle. This rectangular shape allows movement to make an effective square. Therefore, emission modulation can be performed at a high duty-cycle because the edge is much shorter in the process direction than in the lateral, i.e., fast scan direction. As a result, the duty cycle of the light source can be higher, i.e., the light source is on for a longer time, without smearing an irradiated spot into locations corresponding to adjacent pixels.Type: GrantFiled: July 15, 1998Date of Patent: December 12, 2000Assignee: Xerox CorporationInventors: David Kirtland Fork, Zoran D. Popovic
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Patent number: 6150824Abstract: A contactless process for detecting electrical patterns on the outer surface of a member comprising providing a member having a charge pattern on an outer surface, repetitively measuring the charge pattern on the outer surface of the member with an electrostatic voltmeter probe maintained at a substantially constant distance from the surface, the distance between the probe and the imaging member being slightly greater than the minimum distance at which Paschen breakdown will occur to form a parallel plate capacitor with a gas between the probe and the surface, the frequency of repetition being selected to cause all time dependent signals to fall out of phase by a predetermined amount, and averaging the out of phase time dependent signals over a sufficient number of measuring repetitions to eliminate the time dependent signals. In one embodiment, the contactless process detects surface potential charge patterns in an electrostatographic imaging member.Type: GrantFiled: October 30, 1997Date of Patent: November 21, 2000Assignee: Xerox CorporationInventors: Satchidanand Mishra, Edward A. Domm, Zoran D. Popovic, Denis C. Thomas, Samy A. Mesbah, Dennis J. Prosser, Steven P. Nonkes
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Patent number: 6119536Abstract: A contactless system including an aerodynamically floatable device, a member having an outer surface adjacent to and spaced from the aerodynamically floatable device, a support mechanism adapted to support the aerodynamically floatable device for free movement toward and away from the outer surface of the member, the aerodynamically floatable device having a side adjacent to, spaced from, parallel to and facing the outer surface of the member, the aerodynamically floatable device also containing at least one passageway for directing at least one stream of a gas from the side of the aerodynamically floatable device toward the outer surface of the member with sufficient pressure to maintain the aerodynamically floatable device a constant distance from the outer surface of the member.Type: GrantFiled: October 30, 1997Date of Patent: September 19, 2000Assignee: Xerox CorporationInventors: Zoran D. Popovic, Philip D. Waldron
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Patent number: 6072517Abstract: An integrating xerographic light emitter array includes circuitry for operating an active matrix array of organic light emitting diodes (OLEDs). The light emitter array stages rows of emitters in the slow scan direction and moves the object image and synchronization with the photoreceptor. Grey scale resolution, increased emitter lifetime and the ability to operate at lower light levels are achieved in proportion to the number of stages. The entire printbar can be rewritten during each line time of the photoreceptor, which allows the exposure on any pixel on the photoreceptor to be varied in a number of grey levels from zero to the number of stages. Bringing a grey level signal to the photoreceptor allows improved continuous tone image quality and line placement. Additional grey resolution is obtained by analog driving of individual pixels. This technique is applicable to a variety of emitters or light valves, but is particularly suited to inexpensive OLEDs.Type: GrantFiled: January 17, 1997Date of Patent: June 6, 2000Assignee: Xerox CorporationInventors: David K. Fork, Zoran D. Popovic
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Patent number: 6057048Abstract: An electroluminescent device comprised of an anode, a hole transporting layer, a light emitting layer, and a cathode, wherein said light emitting layer contains a component of the formula ##STR1## wherein Ar.sup.1, Ar.sup.2, Ar.sup.3, and Ar.sup.4 are each independently aryl or optionally aliphatic; R.sup.1 and R.sup.2 are independently selected from the group consisting of hydrogen, aliphatic, halogen, and cyano; L is a suitable linking group; and n is a number of from 0 to about 3.Type: GrantFiled: October 1, 1998Date of Patent: May 2, 2000Assignee: Xerox CorporationInventors: Nan-Xing Hu, Mohammad Esteghamatian, Yu Qi, Zoran D. Popovic, Beng S. Ong, Ah-Mee Hor
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Patent number: 6008653Abstract: A contactless process for detecting surface potential charge patterns in an electrophotographic imaging member including at least one photoconductive imaging layer having an imaging surface, providing a scanner including a capacitive probe having an outer shield electrode, maintaining the probe adjacent to and spaced from the imaging surface to form a parallel plate capacitor with a gas between the probe and the imaging surface, providing a probe amplifier optically coupled to the probe, establishing relative movement between the probe and the imaging surface, maintaining a substantially constant distance between the probe and the imaging surface, applying a constant voltage charge to the imaging surface prior to relative movement of the probe and the imaging surface past each other, synchronously biasing the probe to within about .+-.Type: GrantFiled: October 30, 1997Date of Patent: December 28, 1999Assignee: Xerox CorporationInventors: Zoran D. Popovic, Steven I. Dejak, Satchidanand Mishra
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Patent number: 5989737Abstract: An organic electroluminescent (EL) device comprised, in the following sequence, of an anode, an organic hole injecting and hole transporting layer, an organic electron injecting and electron transporting layer, and a cathode, wherein said organic hole injecting and transporting layer is comprised of a mixture of a tertiary aromatic amine and a polycyclic aromatic hydrocarbon compound.Type: GrantFiled: February 27, 1997Date of Patent: November 23, 1999Assignee: Xerox CorporationInventors: Shuang Xie, Nan-Xing Hu, Zoran D. Popovic, Ah-Mee Hor, Beng S. Ong
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Patent number: 5952115Abstract: An organic electroluminescent (EL) device with a charge transport component of an indolocarbazole compound represented by Formulas (I) or (II) ##STR1## wherein R and R' are independently selected from the group consisting of hydrogen, alkyl, alkoxyl, aryl, and halogen; m and n are numbers from 0 to 4; A.sup.1 and A.sup.2 are arylene; Ar.sup.1, Ar.sup.2, Ar.sup.3, and Ar.sup.4 are aryl; R.sup.1 and R.sup.2 are independently selected from the group consisting of hydrogen, alkyl, alkoxyl, aryl, and halogen; and p is a number from 1 to 3.Type: GrantFiled: October 2, 1997Date of Patent: September 14, 1999Assignee: Xerox CorporationInventors: Nan-Xing Hu, Shuang Xie, Zoran D. Popovic, Beng S. Ong, Ah-Mee Hor
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Patent number: 5942340Abstract: An organic electroluminescent device member comprised of a charge transport component of an indolocarbazole represented by Formulas (I), (II), (III), (IV), (V), or (VI); or optionally mixtures thereof ##STR1## wherein R and R' are independently selected from the group consisting of a hydrogen atom, halogen atom, alkyl, alkoxyl, and aryl; m and n are numbers of 0 to 4; R.sup.1 and R.sup.2 are independently selected from the group consisting of alkyl, aryl, and vinyl; R.sup.3 and R.sup.4 are independently selected from the group consisting of a hydrogen atom, halogen atom, alkyl, alkoxy, and aryl, and p is a number from 1 to 3.Type: GrantFiled: October 2, 1997Date of Patent: August 24, 1999Assignee: Xerox CorporationInventors: Nan-Xing Hu, Shuang Xie, Zoran D. Popovic, Beng S. Ong, Ah-Mee Hor
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Patent number: 5932363Abstract: A luminescent composition containing a mixture of a fluorescent material and a metal chelate compound of the formulaL.sub.n --M.sup.+n (I)wherein M represents a metal; n is a number of from 1 to 3, and L is a ligand of the formula ##STR1## wherein Ar is an aryl; X is selected from the group consisting of oxygen, sulfur, and selenium; N is nitrogen; O is oxygen, and Z is a suitable aromatic component.Type: GrantFiled: October 2, 1997Date of Patent: August 3, 1999Assignee: Xerox CorporationInventors: Nan-Xing Hu, Shuang Xie, Zoran D. Popovic, Beng S. Ong, Ah-Mee Hor
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Patent number: 5925472Abstract: A metal chelate compound of the formulaL.sub.n --M.sup.+n (I)wherein M represents a metal; n is an integer, or number of from 1 to 3; and L is a ligand of ##STR1## wherein Ar is aryl; X is selected from the group consisting of oxygen, sulfur, and selenium; N is nitrogen; O is oxygen; and Z is a suitable aromatic component.Type: GrantFiled: March 31, 1997Date of Patent: July 20, 1999Assignee: Xerox CorporationInventors: Nan-Xing Hu, Shuang Xie, Zoran D. Popovic, Beng S. Ong, Ah-Mee Hor