Patents by Inventor Sreeram Dhurjaty
Sreeram Dhurjaty 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: 11612047Abstract: It would be advantageous to reduce weight and size of high voltage power supplies, to increase frequency of pulses of high voltage, and to improve control of magnitude of high voltage. The embodiments of high voltage power supplies described herein can solve these problems. The high voltage power supply can be used with an x-ray tube. The high voltage power supply can comprise an array of planar transformers each defining a stage with an AC input and a DC output. Each stage can comprise a pair of flat, coil windings adjacent one another and including a primary winding electrically-coupled to the AC input and configured to induce a current in a secondary winding. At least two stages can be electrically-coupled together in series with the DC output of one stage electrically-coupled to an input of the other stage such that a voltage is amplified across the stages.Type: GrantFiled: March 15, 2021Date of Patent: March 21, 2023Assignee: Moxtek, Inc.Inventors: Sreeram Dhurjaty, David Hoffman, Bob West
-
Publication number: 20210319972Abstract: It would be advantageous to reduce weight and size of high voltage power supplies, to increase frequency of pulses of high voltage, and to improve control of magnitude of high voltage. The embodiments of high voltage power supplies described herein can solve these problems. The high voltage power supply can be used with an x-ray tube. The high voltage power supply can comprise an array of planar transformers each defining a stage with an AC input and a DC output. Each stage can comprise a pair of flat, coil windings adjacent one another and including a primary winding electrically-coupled to the AC input and configured to induce a current in a secondary winding. At least two stages can be electrically-coupled together in series with the DC output of one stage electrically-coupled to an input of the other stage such that a voltage is amplified across the stages.Type: ApplicationFiled: March 15, 2021Publication date: October 14, 2021Inventors: Sreeram Dhurjaty, David Hoffman, Bob West
-
Patent number: 9683954Abstract: A material signature detector that provides for the assessment of changes in critical material properties of materials such as pharmaceuticals and solutions is disclosed. The material signature detector is non-contact and non-invasive and provides the ability to detect unintended changes in the contents of a vial or other container during the fill-finish process, transport, compounding, or storage. The material signature detector uses a novel resonant electrical impulse spectroscopy circuit that employs quadrature demodulation at lower frequencies to detect changes in the capacitance and conductance (resistance) of the sample under test. A series of digital signatures are created at different frequencies to provide an overall assessment of changes in the properties of the material under test. These digital signatures may in turn be stored in an electronic library for subsequent analytics.Type: GrantFiled: January 27, 2014Date of Patent: June 20, 2017Inventor: Sreeram Dhurjaty
-
Publication number: 20150212027Abstract: A material signature detector that provides for the assessment of changes in critical material properties of materials such as pharmaceuticals and solutions is disclosed. The material signature detector is non-contact and non-invasive and provides the ability to detect unintended changes in the contents of a vial or other container during the fill-finish process, transport, compounding, or storage. The material signature detector uses a novel resonant electrical impulse spectroscopy circuit that employs quadrature demodulation at lower frequencies to detect changes in the capacitance and conductance (resistance) of the sample under test. A series of digital signatures are created at different frequencies to provide an overall assessment of changes in the properties of the material under test. These digital signatures may in turn be stored in an electronic library for subsequent analytics.Type: ApplicationFiled: January 27, 2014Publication date: July 30, 2015Inventor: Sreeram Dhurjaty
-
Patent number: 8389944Abstract: A digital radiography detector includes a housing having first and second spaced planar members and four side walls defining a cavity. A radiographic image detector assembly is mounted within the cavity for converting a radiographic image to an electronic radiographic image. The detector assembly includes a detector array mounted on a stiffener. A shock absorbing elastomer assembly is located within the cavity for absorbing shock to the detector array/stiffener in directions perpendicular to and parallel to the detector array/stiffener.Type: GrantFiled: July 19, 2011Date of Patent: March 5, 2013Assignee: Carestream Health, Inc.Inventors: Bradley S. Jadrich, Timothy A. Peter, Sreeram Dhurjaty, Jeffery R. Hawver, Mark D. Bedzyk
-
Publication number: 20110272588Abstract: A digital radiography detector includes a housing having first and second spaced planar members and four side walls defining a cavity. A radiographic image detector assembly is mounted within the cavity for converting a radiographic image to an electronic radiographic image. The detector assembly includes a detector array mounted on a stiffener. A shock absorbing elastomer assembly is located within the cavity for absorbing shock to the detector array/stiffener in directions perpendicular to and parallel to the detector array/stiffener.Type: ApplicationFiled: July 19, 2011Publication date: November 10, 2011Inventors: Bradley S. Jadrich, Timothy A. Peter, Sreeram Dhurjaty, Jeffery R. Hawver, Mark D. Bedzyk
-
Patent number: 7989773Abstract: A digital radiography detector includes a housing and a radiographic image detector assembly. The housing has a first and second spaced planar members and four side walls defining a cavity. The radiographic image detector assembly is mounted within the cavity for converting a radiographic image to an electronic radiographic image. The detector assembly includes a scintillator screen and a detector array, and the detector assembly is bonded to the first planar member of the housing.Type: GrantFiled: January 16, 2009Date of Patent: August 2, 2011Assignee: Carestream Health, Inc.Inventors: Bradley S. Jadrich, Timothy A. Peter, Sreeram Dhurjaty, Jeffery R. Hawver, Mark D. Bedzyk
-
Publication number: 20100158197Abstract: A digital radiography detector includes a housing and a radiographic image detector assembly. The housing has a first and second spaced planar members and four side walls defining a cavity. The radiographic image detector assembly is mounted within the cavity for converting a radiographic image to an electronic radiographic image. The detector assembly includes a scintillator screen and a detector array, and the detector assembly is bonded to the first planar member of the housing.Type: ApplicationFiled: March 1, 2010Publication date: June 24, 2010Inventors: Bradley S. Jadrich, Timothy A. Peter, Sreeram Dhurjaty, Jeffery R. Hawver, Mark D. Bedzyk
-
Publication number: 20090122959Abstract: A digital radiography detector includes a housing and a radiographic image detector assembly. The housing has a first and second spaced planar members and four side walls defining a cavity. The radiographic image detector assembly is mounted within the cavity for converting a radiographic image to an electronic radiographic image. The detector assembly includes a scintillator screen and a detector array, and the detector assembly is bonded to the first planar member of the housing.Type: ApplicationFiled: January 16, 2009Publication date: May 14, 2009Inventors: Bradley S. Jadrich, Timothy A. Peter, Sreeram Dhurjaty, Jeffery R. Hawver, Mark D. Bedzyk
-
Patent number: 7495226Abstract: A digital radiography detector includes a housing having first and second spaced planar members and four side walls defining a cavity. A radiographic image detector assembly is mounted within the cavity for converting a radiographic image to an electronic radiographic image. The detector assembly includes a detector array mounted on a stiffener. A shock absorbing elastomer assembly is located within the cavity for absorbing shock to the detector array/stiffener in directions perpendicular to and parallel to the detector array/stiffener.Type: GrantFiled: May 26, 2006Date of Patent: February 24, 2009Assignee: Carestream Health, Inc.Inventors: Bradley S. Jadrich, Timothy A. Peter, Sreeram Dhurjaty, Jeffery R. Hawver, Mark D. Bedzyk
-
Patent number: 7456409Abstract: A low noise digital radiography image capture system employs a two-dimensional array of pixel sites in the image capture panel with each site having an analog-to-digital converter to digitize analog charge values produced by imaging radiation directly into corresponding digital data at the site prior to read-out to subsequent digital data processing electronics thereby avoiding noise and crosstalk problems associated with high frequency read-out of analog information. Fill factor problems caused by inclusion of integrated circuitry on the pixel site are minimized by inclusion of the A/D counter on the opposite side of the substrate support for the pixel site.Type: GrantFiled: July 28, 2005Date of Patent: November 25, 2008Assignee: Carestream Health, Inc.Inventors: Sreeram Dhurjaty, Timothy J. Wojcik
-
Patent number: 7453983Abstract: A method for delivering radiation therapy to a patient using a three-dimensional planning image for radiation therapy of the patient wherein the planning image includes a radiation therapy target. The method includes the steps of: determining desired image capture conditions for the capture of at least one two-dimensional radiographic image of the radiation therapy target using the three-dimensional planning image; detecting a position of the radiation therapy target in the at least one captured two-dimensional radiographic image; and determining a delivery of the radiation therapy in response to the radiation therapy target's detected position in the at least one captured two-dimensional radiographic image.Type: GrantFiled: January 20, 2005Date of Patent: November 18, 2008Assignee: Carestream Health, Inc.Inventors: Jay S. Schildkraut, Nathan D. Cahill, Sreeram Dhurjaty, Lawrence A. Ray
-
Publication number: 20070272873Abstract: A digital radiography detector includes a housing having first and second spaced planar members and four side walls defining a cavity. A radiographic image detector assembly is mounted within the cavity for converting a radiographic image to an electronic radiographic image. The detector assembly includes a detector array mounted on a stiffener. A shock absorbing elastomer assembly is located within the cavity for absorbing shock to the detector array/stiffener in directions perpendicular to and parallel to the detector array/stiffener.Type: ApplicationFiled: May 26, 2006Publication date: November 29, 2007Inventors: Bradley S. Jadrich, Timothy A. Peter, Sreeram Dhurjaty, Jeffery R. Hawver, Mark D. Bedzyk
-
Patent number: 7211802Abstract: A wireless, independent digital imaging sensor utilizes an external charge balance capacitor to establish a sense voltage at a common node between the charge capacitor and the pixel intrinsic capacitors in the sensor panel. A variable width pulse train responds to the sense voltage to control injection of charge to the external capacitor to maintain a constant voltage at the common equal to a reference voltage. An increase in pulse width above a threshold level representative of the onset of X-ray exposure is detected to generate an output control signal used to control subsequent image acquisition functions of the imaging sensor.Type: GrantFiled: December 30, 2005Date of Patent: May 1, 2007Assignee: Eastman Kodak CompanyInventors: Sreeram Dhurjaty, Gordon Geisbuesch, John Yorkston, Joshua M. Silbermann, Jeffery R. Hawver
-
Patent number: 7211803Abstract: A wireless X-ray detector for a digital radiography system with remote detection of impinging radiation from the system X-ray source onto a sensor panel having amorphous or crystalline silicon photodiodes or metal insulated semiconductor (MIS) sensors. Changes in current in the photodiode bias supply circuit is sensed to generate a signal indicating presence of radiation. Improved detection of X-ray cessation is achieved either by leaving at least one line of sensors connected between the bias supply circuit to a virtual ground during charge accumulation or by using an X-ray presence detector circuit that increases the sensitivity of the detector circuit to bias circuit current changes occurring after onset of the radiation.Type: GrantFiled: April 24, 2006Date of Patent: May 1, 2007Assignee: Eastman Kodak CompanyInventors: Sreeram Dhurjaty, John Yorkston
-
Publication number: 20070023668Abstract: A low noise digital radiography image capture system employs a two-dimensional array of pixel sites in the image capture panel with each site having an analog-to-digital converter to digitize analog charge values produced by imaging radiation directly into corresponding digital data at the site prior to read-out to subsequent digital data processing electronics thereby avoiding noise and crosstalk problems associated with high frequency read-out of analog information. Fill factor problems caused by inclusion of integrated circuitry on the pixel site are minimized by inclusion of the A/D counter on the opposite side of the substrate support for the pixel site.Type: ApplicationFiled: July 28, 2005Publication date: February 1, 2007Inventors: Sreeram Dhurjaty, Timothy Wojcik
-
Publication number: 20060182326Abstract: A method for delivering radiation therapy to a patient using a three-dimensional planning image for radiation therapy of the patient wherein the planning image includes a radiation therapy target. The method includes the steps of: determining desired image capture conditions for the capture of at least one two-dimensional radiographic image of the radiation therapy target using the three-dimensional planning image; detecting a position of the radiation therapy target in the at least one captured two-dimensional radiographic image; and determining a delivery of the radiation therapy in response to the radiation therapy target's detected position in the at least one captured two-dimensional radiographic image.Type: ApplicationFiled: January 20, 2005Publication date: August 17, 2006Inventors: Jay Schildkraut, Nathan Cahill, Sreeram Dhurjaty, Lawrence Ray
-
Patent number: 6597949Abstract: A defibrillator which contains a device for producing alternating voltage, a power factor controller for converting the alternating voltage to a direct voltage, and a device for converting the direct voltage into a biphasic waveform voltage. The defibrillator also contains a device for sensing the electrical activity of a human heart and for allowing one to hear an audio signal corresponding to such activity.Type: GrantFiled: October 25, 2000Date of Patent: July 22, 2003Inventor: Sreeram Dhurjaty
-
Patent number: 6219083Abstract: A laser imaging system having a diode laser for producing a laser beam; a beamsplitter for splitting the laser beam into a laser writing portion and a feedback portion; a photodetector for detecting the feedback portion; a photodetector amplifier for amplifying the output of the photodetector; a sample and hold coupled to the photodetector amplifier; an integrator adder; an integrator for integrating the outputs of the photodetector amplifier and the sample and hold processed by the integrator adder; and a laser input circuit including a laser amplifier, a linear power signal provider, a threshold power signal provider, and a laser input adder for adding the laser power signal, the linear power signal, and the output of the integrator.Type: GrantFiled: December 21, 1998Date of Patent: April 17, 2001Assignee: Eastman Kodak CompanyInventors: Sreeram Dhurjaty, Douglas Seim, Brian K. Rhoda
-
Patent number: 6031583Abstract: A high frequency video isolation circuit comprising: a modulating signal source for producing a modulating signal having a frequency of several hundred megahertz; an input multiplier for multiplying the modulating signal with an input video signal having frequency components in a frequency range from about several hertz to about one hundred or more megahertz, to produce a modulated video signal having frequency components in a frequency range from about one hundred megahertz to about several hundred megahertz; a first isolation transformer having an input and an output, for transforming the modulated video signal from the input to the output; and an output multiplier for multiplying the transformed modulated video signal with the modulating signal to produce an isolated output video signal having the frequency components of the input video signal.Type: GrantFiled: June 9, 1998Date of Patent: February 29, 2000Assignee: Eastman Kodak CompanyInventors: Sreeram Dhurjaty, Martin E. Trzcinski