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George E Zentai

from Hayward, CA
Deceased

George Zentai Phones & Addresses

  • Hayward, CA
  • Rancho Santa Fe, CA
  • Fort Lauderdale, FL
  • Willits, CA
  • San Carlos, CA
  • Fort Myers, FL
  • Mountain View, CA
  • Naperville, IL
  • Northville, MI
  • Sunnyvale, CA
  • San Jose, CA

Publications

Us Patents

Electrostatic Imager

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US Patent:
6921892, Jul 26, 2005
Filed:
Dec 18, 2002
Appl. No.:
10/325809
Inventors:
Richard Colbeth - Los Altos CA, US
George Zentai - Mountain View CA, US
Shuji Yamaoka - Hiroshima, JP
Assignee:
Varian Medical Systems, Inc. - Palo Alto CA
International Classification:
G02F001/13
G02F001/1333
US Classification:
2502141, 349199, 359 54
Abstract:
An apparatus and method for detecting an electrostatic charge on a flat panel imager pixel array. In one embodiment, the apparatus includes an insulator layer and a flat panel pixel array coupled to a bottom surface of the insulator layer. Each pixel of the pixel array has a storage capacitance, and an electrostatic charge corresponding to a voltage applied through an electrode coupled to a top surface of the insulating layer may be detected from each storage capacitance.

Photodetector Biasing Scheme

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US Patent:
6969896, Nov 29, 2005
Filed:
Aug 12, 2003
Appl. No.:
10/639931
Inventors:
Larry Dean Partain - Los Altos CA, US
George Zentai - Mountain View CA, US
Raisa Pavlyuchkova - Palo Alto CA, US
Assignee:
Varian Medical Systems Technologies, Inc. - Palo Alto CA
International Classification:
H01L027/142
US Classification:
257428, 378 29
Abstract:
A photodetector having a semiconductor conversion layer is described. The photodetector is configured to receive x-rays incident on its substrate with the substrate-side contact biased so that the lowest mobility carrier in the semiconductor conversion layer is collected by the substrate side contact.

Multi Energy X-Ray Imager

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US Patent:
7054410, May 30, 2006
Filed:
May 15, 2003
Appl. No.:
10/439350
Inventors:
George Zentai - Mountain View CA, US
Larry Partain - Los Altos CA, US
Assignee:
Varian Medical Systems, Inc. - Palo Alto CA
International Classification:
G01N 23/00
US Classification:
378 19, 378 988, 25037009
Abstract:
An X-ray image acquisition apparatus includes a panel having a first electrode, a second electrode, and a photoconductor secured between said first and second electrodes. The photoconductor has a thickness configured to absorb X-ray radiation at a high energy level. The first and second electrodes are configured to create an electric field for transporting charges created in the photoconductor to a pixel unit, thereby allowing charges to be efficiently collected when low or high energy X-ray radiation is used.

Process To Reduce The Dark Current In Semiconducting Films

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US Patent:
7151006, Dec 19, 2006
Filed:
Nov 4, 2003
Appl. No.:
10/701724
Inventors:
George Zentai - Mountain View CA, US
Larry D. Partain - Los Altos CA, US
Kanai S. Shah - Newton MA, US
Paul R. Bennett - Acton MA, US
Assignee:
Varian Medical Systems Technologies, Inc. - Palo Alto CA
Radiation Monitoring Devices, Inc. - Watertown MA
International Classification:
H01L 21/00
H01L 27/14
US Classification:
438 22, 438 24, 438 48, 438 56, 257414, 257431
Abstract:
A method of coating the joined crystals within a semiconductor conversion layer to reduce the dark current without compromising the sensitivity of the conversion layer is presented. A semiconductor conversion layer comprising a plurality of joined crystals and permeated by a polymer material and having microscopic voids is also presented.

Photoconductor Imagers With Sandwich Structure

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US Patent:
7291842, Nov 6, 2007
Filed:
Jun 14, 2005
Appl. No.:
11/153017
Inventors:
George Zentai - Mountain View CA, US
Larry D. Partain - Los Gatos CA, US
Assignee:
Varian Medical Systems Technologies, Inc. - Palo Alto CA
International Classification:
G01T 1/24
US Classification:
25037009
Abstract:
An image acquisition device includes a photoconductor to convert an electromagnetic radiation into electrical signals, a first layer or coupled to the photoconductor. The first layer or includes an insulator and a plurality of conductors or embedded in the insulator to conduct the electrical signals. A method of making an image acquisition device includes the step of sandwiching a layer including an insulator and a plurality of conductors embedded in the insulator between a photoconductor layer and an electrode.

Voltage Injector And Detector Using Pixel Array For Printed Circuit Board Testing

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US Patent:
7355385, Apr 8, 2008
Filed:
Jul 28, 2005
Appl. No.:
11/192849
Inventors:
George Zentai - Mountain View CA, US
Assignee:
Varian Medical Systems Technologies, Inc. - Palo Alto CA
International Classification:
G01R 31/26
G01R 31/02
US Classification:
3241581, 324765, 324750, 324537
Abstract:
One embodiment includes an injector pixel array having injector pixels each coupled to the bottom surface of a conductive material having a directional electrical conductivity only in a direction corresponding to a path between the bottom surface and top surface of the conductive material. Each injector pixel includes a semiconductor based switch coupled to a charge or voltage driver to inject a charge or voltage into each injector pixel. Embodiments, also include a detector pixel array having detector pixels each coupled to the bottom surface of the directionally conductive material. Each detector pixel includes a semiconductor based switch coupled to a charge or voltage storage capacitor to detect a charge or voltage at each detector pixel.

Megavoltage Imaging With A Photoconductor Based Sensor

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US Patent:
7884438, Feb 8, 2011
Filed:
Jul 29, 2005
Appl. No.:
11/193162
Inventors:
Larry Dean Partain - Los Altos CA, US
George Zentai - Mountain View CA, US
Assignee:
Varian Medical Systems, Inc. - Palo Alto CA
International Classification:
H01L 27/146
US Classification:
257443, 257 72, 257428, 257431, 257444, 257448, 257E31086, 257E31092, 25037009
Abstract:
A photodetector for detecting megavoltage (MV) radiation comprises a semiconductor conversion layer having a first surface and a second surface disposed opposite the first surface, a first electrode coupled to the first surface, a second electrode coupled to the second surface, and a low density substrate including a detector array coupled to the second electrode opposite the semiconductor conversion layer. The photodetector includes a sufficient thickness of a high density material to create a sufficient number of photoelectrons from incident MV radiation, so that the photoelectrons can be received by the conversion layer and converted to a sufficient of recharge carriers for detection by the detector array.

Corrosion Barrier Layer For Photoconductive X-Ray Imagers

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US Patent:
8232531, Jul 31, 2012
Filed:
Mar 29, 2007
Appl. No.:
11/731170
Inventors:
George Zentai - Mountain View CA, US
Larry Partain - Los Altos CA, US
William Wei-Yu Yao - Los Altos CA, US
Richard Weisfield - Los Altos CA, US
Assignee:
Varian Medical Systems, Inc. - Palo Alto CA
dpiX, LLC - Palo Alto CA
International Classification:
H01L 25/00
US Classification:
25037012
Abstract:
Improved corrosion resistance for direct X-ray imaging detectors is obtained by providing a pixelated, electrically conductive barrier layer between the X-ray sensitive material and the pixel electrodes. Each barrier layer can cover part or all of its corresponding pixel electrode. In cases where pixel electrodes makes contact to underlying circuitry through vertical vias, it is preferred for the barrier layers to cover the via sections of the pixel electrodes. The barrier layers for each pixel electrode can be spaced apart from each other, or they can all be included within a continuous film on top of the pixel electrodes. Such a continuous film can be pixelated by spatially modulating its properties (e. g. , thickness, doping) to significantly reduce lateral conductivity from pixel to pixel.
George E Zentai from Hayward, CADeceased Get Report