Patents by Inventor Yousheng Shen
Yousheng Shen 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: 6896781Abstract: A highly accurate, long life, low cost gas sensor is disclosed, particularly useful for measuring carbon monoxide and other toxic gases in an environment. The gas sensor has a first, sensing electrode and a second, counting electrode. Positioned between the first and second electrodes is an ion conducting, solid electrolyte membrane. In response to the presence of a toxic gas introduced to the first electrode, an electric signal is produced between the first electrode and the second electrode. The electric signal changes in response to changes in the concentration of the toxic gas. Detection circuitry measures the electric signal to determine the concentration of the toxic gas. An electrically conductive, hydrophobic top membrane electrically connects the first electrode to the detection circuitry while preventing liquid water from contacting the first electrode. An electrically conductive, hydrophobic bottom membrane electrically connects the second electrode to the detection circuitry.Type: GrantFiled: June 9, 2000Date of Patent: May 24, 2005Assignee: Dura Global Technologies, Inc.Inventors: Yousheng Shen, Franco Consadori
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Patent number: 6200443Abstract: A highly accurate, long life, low cost gas sensor is disclosed, particularly useful for measuring carbon monoxide and other toxic gases in an environment. The gas sensor has a first, sensing electrode and a second, counting electrode. Positioned between the first and second electrodes is an ion conducting, solid electrolyte membrane. In response to the presence of a toxic gas introduced to the first electrode, an electric signal is produced between the first electrode and the second electrode. The electric signal changes in response to changes in the concentration of the toxic gas. Detection circuitry measures the electric signal to determine the concentration of the toxic gas. An electrically conductive, hydrophobic top membrane electrically connects the first electrode to the detection circuitry while preventing liquid water from contacting the first electrode. An electrically conductive, hydrophobic bottom membrane electrically connects the second electrode to the detection circuitry.Type: GrantFiled: September 29, 1998Date of Patent: March 13, 2001Assignee: Atwood Industries, Inc.Inventors: Yousheng Shen, Franco Consadori
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Patent number: 6080294Abstract: A highly accurate, long life, low cost gas sensor is disclosed, particularly useful for measuring oxygen in an environment. The gas sensor has a first, sensing electrode and a second, counting electrode. Dual electrolytes are electrically serially connected between the first and second electrodes. One of the electrolytes is an ion conducting solid electrolyte, the second is a liquid electrolyte. In response to an electric current an electrical characteristic is produced, and the electrical characteristic changes in response to changes in the concentration of a gas such as oxygen introduced at the first, sensing electrode. The solid electrolyte can be a perfluorinated polymer which advantageously controls the rate of the electrochemical reaction to give the sensor a long life without need for continuous recalibration.Type: GrantFiled: July 15, 1998Date of Patent: June 27, 2000Assignee: Atwood Industries, Inc.Inventors: Yousheng Shen, Franco Consadori
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Patent number: 5650054Abstract: A low cost room temperature electrochemical gas sensor with humidity compensation for sensing CO, alcohol vapors and other toxic analyte gases has a solid protonic conductive membrane with a low bulk ionic resistance. A sensing electrode and a counter electrode, optionally a counter electrode and a reference electrode, which are separated by the membrane, can be made of mixed protonic-electronic conductors, or can be made of a thin electrically conducting film such as platinum. A reservoir of water maintain the solid protonic conductive membrane at constant 100 percent relative humidity to compensate for ambient humidity changes. Embodiments of the inventive sensor also include an electrochemical analyte gas pump to transport the analyte gas away from the counter electrode side of the sensor.Type: GrantFiled: September 1, 1995Date of Patent: July 22, 1997Assignee: Atwood Industries, Inc.Inventors: Yousheng Shen, Franco Consadori, D. George Field
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Patent number: 5624542Abstract: Enhancement of mechanical properties of ceramic membranes by introduction of a uniformly distributed high-temperature oxidation-resistant metal phase into the brittle ceramic phase to achieve mechanically strong ceramic/metal composites operable in an oxidation atmosphere and at elevated temperatures.Type: GrantFiled: June 12, 1995Date of Patent: April 29, 1997Assignee: Gas Research InstituteInventors: Yousheng Shen, Ashok V. Joshi, Dale M. Taylor, Michael J. Boettcher, Kevin Krist, Anil V. Virkar
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Patent number: 5616223Abstract: Composite ceramic mixed ionic and electronic conducting materials having high ambipolar activity which can be fabricated into thin membranes for high efficiency oxygen separation from air at intermediate temperatures. The mixed conducting materials have composite non-homogeneous microstructures of a separate predominantly oxygen ion conductive phase and a predominantly electronic conductive phase. Preferred predominantly oxygen ion conducting phases include bismuth, cerium and zirconium oxide based materials and predominantly electronic conducting phases include at least one metal electronic conductor material.Type: GrantFiled: April 22, 1994Date of Patent: April 1, 1997Assignee: Gas Research InstituteInventors: Yousheng Shen, Ashok V. Joshi, Kevin Krist, Meilin Liu, Anil V. Virkar
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Patent number: 5573648Abstract: A low cost room temperature electrochemical gas sensor for sensing CO and other toxic analyte gases has a solid protonic conductive membrane with a low bulk ionic resistance. A sensing electrode and a count counter electrode, which are separated by the membrane, can be made of mixed protonic-electronic conductors. Embodiments of the inventive sensor also include an electrochemical analyte gas pump to transport the analyte gas away from the counter electrode side of the sensor. Analyte gas pumps for the inventive sensor include dual pumping electrodes situated on opposite sides of the membrane, and include a means for applying a DC power across the membrane to the sensing and counter electrodes. Another embodiment of the inventive sensor has first and second solid protonic conductive membranes, one of which has a sensing electrode and a counter electrode separated by the first membrane, and the other of which has dual pumping electrodes situated on opposite sides of the second membrane.Type: GrantFiled: January 31, 1995Date of Patent: November 12, 1996Assignee: Atwood Systems and ControlsInventors: Yousheng Shen, Franco Consadori, D. George Field
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Patent number: 5567287Abstract: A self-contained device which continuously dispenses a packaged fluid is disclosed. The device is particularly suited for applications where several months may lapse before performance is manually initiated, after which a consistent steady flow is required for an extended period until the packaged fluid is exhausted. The device is particularly suited for applications where ease of fabrication is important. The device utilizes an electrochemicalIy-generated gas, such as oxygen or nitrogen, to pressurize the packaged fluid to dispense it. Oxygen can be electrochemically released from a solid anode material of the general form AxOy as A ions migrate across a suitable ion-conducting electrolyte. Alternatively, nitrogen can be the pressurizing gas wherein it is electrochemically released from a solid, anode material of the general form A'.sub..alpha. N.sub..beta. where A' is a cation, as A' ions migrate across a suitable ion-conducting electrolyte.Type: GrantFiled: June 27, 1995Date of Patent: October 22, 1996Assignee: Ceramatec, Inc.Inventors: Ashok V. Joshi, John H. Gordon, Yousheng Shen
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Patent number: 5478444Abstract: A composite ceramic mixed oxygen ion and electronic conducting materials having high ambipolar activity which can be fabricated into thin membranes for high efficiency oxygen separation from air at intermediate temperatures. The mixed conducting materials have composite non-homogeneous microstructures of a separate predominantly oxygen ion conductive phase and a predominantly electronic conductive phase. Predominantly oxygen ion conducting phases include bismuth, cerium and thorium oxide based materials and predominantly electronic conducting phases include at least one metal, metal oxide of at least one metal, and at least one perovskite-type electronic conductor material.Type: GrantFiled: November 1, 1993Date of Patent: December 26, 1995Assignee: Gas Research InstituteInventors: Meilin Liu, Ashok V. Joshi, Yousheng Shen, Kevin Krist, Anil V. Virkar
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Patent number: 5427870Abstract: A self-contained device which continuously dispenses a packaged fluid is disclosed. The device is particularly suited for applications where several months may lapse before performance is manually initiated, after which a consistent steady flow is required for an extended period until the packaged fluid is exhausted. The device is particularly suited for applications where ease of fabrication is important. The device utilizes an electrochemically-generated gas, such as oxygen or nitrogen, to pressurize the packaged fluid to dispense it. Oxygen can be electrochemically released from a solid anode material of the general form AxOy as A ions migrate across a suitable ion-conducting electrolyte. Alternatively, nitrogen can be the pressurizing gas wherein it is electrochemically released from a solid, anode material of the general form A'.sub..alpha. N.sub..beta. where A' is a cation, as A' ions migrate across a suitable ion-conducting electrolyte.Type: GrantFiled: September 6, 1994Date of Patent: June 27, 1995Assignee: Ceramatec, Inc.Inventors: Ashok V. Joshi, John H. Gordon, Yousheng Shen
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Patent number: 5273628Abstract: Mixed oxygen ion and electronic conducting bismuth oxide based ceramic materials having high ambipolar activity which can be fabricated into thin membranes for high efficiency oxygen separation from air at intermediate temperatures. The ceramic materials may be homogeneous microstructures in the form of solid solutions or compounds or may be composite non-homogeneous microstructures of a separate substantially continuous oxygen ion conductive phase and a substantially continuous electronic conductive phase.Type: GrantFiled: May 11, 1992Date of Patent: December 28, 1993Assignee: Gas Research InstituteInventors: Meilin Liu, Ashok V. Joshi, Yousheng Shen, Kevin Krist
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Patent number: RE45100Abstract: A low cost room temperature electrochemical gas sensor for sensing CO and other toxic analyte gases has a solid protonic conductive membrane with a low bulk ionic resistance. A sensing electrode and a count counter electrode, which are separated by the membrane, can be made of mixed protonic-electronic conductors. Embodiments of the inventive sensor also include an electrochemical analyte gas pump to transport the analyte gas away from the counter electrode side of the sensor. Analyte gas pumps for the inventive sensor include dual pumping electrodes situated on opposite sides of the membrane, and include a means for applying a DC power across the membrane to the sensing and counter electrodes. Another embodiment of the inventive sensor has first and second solid protonic conductive membranes, one of which has a sensing electrode and a counter electrode separated by the first membrane, and the other of which has dual pumping electrodes situated on opposite sides of the second membrane.Type: GrantFiled: July 17, 2003Date of Patent: September 2, 2014Assignee: Atwood Mobile Products Inc.Inventors: Yousheng Shen, Franco Consadori, D. George Field
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Patent number: RE45186Abstract: A low cost room temperature electrochemical gas sensor with humidity compensation for sensing CO, alcohol vapors and other toxic analyte gases has a solid protonic conductive membrane with a low bulk ionic resistance. A sensing electrode and a counter electrode, optionally a counter electrode and a reference electrode, which are separated by the membrane, can be made of mixed protonic-electronic conductors, or can be made of a thin electrically conducting film such as platinum. A reservoir of water maintain the solid protonic conductive membrane at constant 100 percent relative humidity to compensate for ambient humidity changes. Embodiments of the inventive sensor also include an electrochemical analyte gas pump to transport the analyte gas away from the counter electrode side of the sensor.Type: GrantFiled: July 17, 2003Date of Patent: October 14, 2014Assignee: Atwood Mobile Products Inc.Inventors: Yousheng Shen, Franco Consadori, D. George Field