Patents by Inventor Paul R. Schwoebel
Paul R. Schwoebel 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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Patent number: 11534118Abstract: Embodiments provide a stationary X-ray source for a multisource X-ray imaging system for tomographic imaging. The stationary X-ray source includes an array of thermionic cathodes and, in most embodiments a rotating anode. The anode rotates about a rotation axis, however the anode is stationary in the horizontal or vertical dimensions (e.g. about axes perpendicular to the rotation axis). The elimination of mechanical motion improves the image quality by elimination of mechanical vibration and source motion; simplifies system design that reduces system size and cost; increases angular coverage with no increase in scan time; and results in short scan times to, in medical some medical imaging applications, reduce patient-motion-induced blurring.Type: GrantFiled: June 3, 2021Date of Patent: December 27, 2022Assignees: The Regents of the University of California, SRI InternationalInventors: Paul R. Schwoebel, John M. Boone
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Publication number: 20210338181Abstract: Embodiments provide a stationary X-ray source for a multisource X-ray imaging system for tomographic imaging. The stationary X-ray source includes an array of thermionic cathodes and, in most embodiments a rotating anode. The anode rotates about a rotation axis, however the anode is stationary in the horizontal or vertical dimensions (e.g. about axes perpendicular to the rotation axis). The elimination of mechanical motion improves the image quality by elimination of mechanical vibration and source motion; simplifies system design that reduces system size and cost; increases angular coverage with no increase in scan time; and results in short scan times to, in medical some medical imaging applications, reduce patient-motion-induced blurring.Type: ApplicationFiled: June 3, 2021Publication date: November 4, 2021Inventors: Paul R. SCHWOEBEL, John M. BOONE
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Patent number: 11123027Abstract: Embodiments provide a stationary X-ray source for a multisource X-ray imaging system for tomographic imaging. The stationary X-ray source includes an array of thermionic cathodes and, in most embodiments a rotating anode. The anode rotates about a rotation axis, however the anode is stationary in the horizontal or vertical dimensions (e.g. about axes perpendicular to the rotation axis). The elimination of mechanical motion improves the image quality by elimination of mechanical vibration and source motion; simplifies system design that reduces system size and cost; increases angular coverage with no increase in scan time; and results in short scan times to, in medical some medical imaging applications, reduce patient-motion-induced blurring.Type: GrantFiled: March 31, 2017Date of Patent: September 21, 2021Assignees: The Regents of the University of California, SRI InternationalInventors: Paul R. Schwoebel, John M. Boone
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Publication number: 20200305809Abstract: Embodiments provide a stationary X-ray source for a multisource X-ray imaging system for tomographic imaging. The stationary X-ray source includes an array of thermionic cathodes and, in most embodiments a rotating anode. The anode rotates about a rotation axis, however the anode is stationary in the horizontal or vertical dimensions (e.g. about axes perpendicular to the rotation axis). The elimination of mechanical motion improves the image quality by elimination of mechanical vibration and source motion; simplifies system design that reduces system size and cost; increases angular coverage with no increase in scan time; and results in short scan times to, in medical some medical imaging applications, reduce patient-motion-induced blurring.Type: ApplicationFiled: March 31, 2017Publication date: October 1, 2020Inventors: Paul R. Schwoebel, John M. Boone
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Patent number: 9508522Abstract: An x-ray generator includes a housing, a cathode block that is arranged in the housing and emits electrons via a field emission scheme, an anode block that is arranged in the housing and generates x-rays in response to the electrons emitted from the cathode block and collide with the anode block, and a heat sink block that contacts the cathode block and dissipates heat generated therein to an outside of the housing.Type: GrantFiled: March 12, 2014Date of Patent: November 29, 2016Assignees: SAMSUNG ELECTRONICS CO., LTD., SRI INTERNATIONALInventors: Shang-hyeun Park, Paul R. Schwoebel, Il-hwan Kim, Do-yoon Kim, Yong-chul Kim, Chang-soo Lee, Tae-won Jeong
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Patent number: 9167677Abstract: Provided are methods of aging an x-ray generator having carbon nanotube electron emitters. The method of aging an x-ray generator that includes a cathode, a gate electrode, and an anode, includes applying a desired, or alternatively predetermined anode voltage to the anode, and applying a direct current pulse voltage to the gate electrodes to emit electrons from electron emitters. The method further includes maintaining an anode current formed by electrons generated from the electron emitters constant.Type: GrantFiled: August 8, 2014Date of Patent: October 20, 2015Assignees: Samsung Electronics Co., Ltd., SRI InternationalInventors: Do-yoon Kim, Il-hwan Kim, Shang-hyeun Park, Chang-soo Lee, Tae-won Jeong, Paul R. Schwoebel, Yong-chul Kim
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Publication number: 20150071413Abstract: Provided are methods of aging an x-ray generator having carbon nanotube electron emitters. The method of aging an x-ray generator that includes a cathode, a gate electrode, and an anode, includes applying a desired, or alternatively predetermined anode voltage to the anode, and applying a direct current pulse voltage to the gate electrodes to emit electrons from electron emitters. The method further includes maintaining an anode current formed by electrons generated from the electron emitters constant.Type: ApplicationFiled: August 8, 2014Publication date: March 12, 2015Applicant: SRI INTERNATIONALInventors: Do-yoon KIM, Il-hwan KIM, Shang-hyeun PARK, Chang-soo LEE, Tae-won JEONG, Paul R. SCHWOEBEL, Yong-chul KIM
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Publication number: 20140270087Abstract: An x-ray generator includes a housing, a cathode block that is arranged in the housing and emits electrons via a field emission scheme, an anode block that is arranged in the housing and generates x-rays in response to the electrons emitted from the cathode block and collide with the anode block, and a heat sink block that contacts the cathode block and dissipates heat generated therein to an outside of the housing.Type: ApplicationFiled: March 12, 2014Publication date: September 18, 2014Applicants: SRI INTERNATIONAL, Samsung Electronics Co., Ltd.Inventors: Shang-hyeun PARK, Paul R. SCHWOEBEL, Il-hwan KIM, Do-yoon KIM, Yong-chul KIM, Chang-soo LEE, Tae-won JEONG
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Patent number: 8410678Abstract: Described is a micro-fabricated charged particle emission device including a substrate and a plurality of charged particle emission sites formed in the substrate. A path extends between each emission site and a source of liquid metal. Each path is coated with a wetting layer of non-oxidizing metal for wetting the liquid metal. Exemplary non-oxidizing metals that may be used to make the wetting layer include gold and platinum. The wetting layer is sufficiently thin such that some liquid metal is able to flow to each emission site despite any chemical interaction between the liquid metal and the non-oxidizing metal of the wetting layer.Type: GrantFiled: February 28, 2012Date of Patent: April 2, 2013Assignee: SRI InternationalInventors: Christopher E. Holland, Paul R. Schwoebel, Charles A. Spindt, Eric M. Pearson, Victor M. Aguero
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Publication number: 20120212120Abstract: Described is a micro-fabricated charged particle emission device including a substrate and a plurality of charged particle emission sites formed in the substrate. A path extends between each emission site and a source of liquid metal. Each path is coated with a wetting layer of non-oxidizing metal for wetting the liquid metal. Exemplary non-oxidizing metals that may be used to make the wetting layer include gold and platinum. The wetting layer is sufficiently thin such that some liquid metal is able to flow to each emission site despite any chemical interaction between the liquid metal and the non-oxidizing metal of the wetting layer.Type: ApplicationFiled: February 28, 2012Publication date: August 23, 2012Applicant: SRI INTERNATIONALInventors: Christopher E. Holland, Paul R. Schwoebel, Charles A. Spindt, Eric M. Pearson, Victor M. Aguero
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Patent number: 8138665Abstract: Described is a micro-fabricated charged particle emission device including a substrate and a plurality of charged particle emission sites formed in the substrate. A path extends between each emission site and a source of liquid metal. Each path is coated with a wetting layer of non-oxidizing metal for wetting the liquid metal. Exemplary non-oxidizing metals that may be used to provide the wetting layer include gold and platinum. The wetting layer is sufficiently thin such that some liquid metal is able to flow to each emission site despite any chemical interaction between the liquid metal and the non-oxidizing metal of the wetting layer.Type: GrantFiled: July 9, 2007Date of Patent: March 20, 2012Assignee: SRI InternationalInventors: Christopher E. Holland, Paul R. Schwoebel, Charles A. Spindt, Eric M. Pearson, Victor M. Aguero
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Publication number: 20090278434Abstract: Described is a micro-fabricated charged particle emission device including a substrate and a plurality of charged particle emission sites formed in the substrate. A path extends between each emission site and a source of liquid metal. Each path is coated with a wetting layer of non-oxidizing metal for wetting the liquid metal. Exemplary non-oxidizing metals that may be used to provide the wetting layer include gold and platinum. The wetting layer is sufficiently thin such that some liquid metal is able to flow to each emission site despite any chemical interaction between the liquid metal and the non-oxidizing metal of the wetting layer.Type: ApplicationFiled: July 9, 2007Publication date: November 12, 2009Applicant: SRI INTERNATIONALInventors: Christopher E. Holland, Paul R. Schwoebel, Charles A. Spindt, Eric M. Pearson, Victor M. Aguero
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Patent number: 6879162Abstract: Described are a method and system for dispensing a fluid. A fluid-dispensing device includes a substrate and a plurality of nozzles formed in the substrate. Each nozzle has an open-ended tip and a fluid-conducting channel between the tip and a source of fluid. A non-conducting spacer is on the substrate and electrically isolates a gate electrode from the substrate. The gate electrode is located adjacent to the tip of at least one of the nozzles to effect dispensing of the fluid in that nozzle in response to a voltage applied between the gate electrode and the nozzle or fluid in the nozzle. In one embodiment, the gate electrode includes a plurality of individually addressable gate electrodes used for selectively actuating nozzles.Type: GrantFiled: October 31, 2002Date of Patent: April 12, 2005Assignee: SRI InternationalInventors: Victor M. Aguero, Elizabeth J. Brackmann, Jose P. Joseph, Christopher E. Holland, Charles A. Spindt, Paul R. Schwoebel, Eric M. Pearson
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Publication number: 20030146757Abstract: Described are a method and system for dispensing a fluid. A fluid-dispensing device comprises a substrate and a plurality of nozzles formed in the substrate. Each nozzle has an open-ended tip and a fluid-conducting channel between the tip and a source of fluid. A non-conducting spacer is on the substrate and electrically isolates a gate electrode from the substrate. The gate electrode is located adjacent to the tip of at least one of the nozzles to effect dispensing of the fluid in that nozzle in response to a voltage applied between the gate electrode and the nozzle or fluid in the nozzle. In one embodiment, the gate electrode includes a plurality of individually addressable gate electrodes used for selectively actuating nozzles.Type: ApplicationFiled: October 31, 2002Publication date: August 7, 2003Inventors: Victor M. Aguero, Elizabeth J. Brackmann, Jose P. Joseph, Christopher E. Holland, Charles A. Spindt, Paul R. Schwoebel, Eric M. Pearson