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- Inventor(s):
- Hsueh-Chia Chang, David T. Leighton
- Patent Number:
- US 6428754 B2
- Description:
An exhaust gas treatment system and method for treating the exhaust gas of an internal combustion engine includes a catalytic converter and a catalytic preheater or igniter upstream of the catalytic converter. A bypass passage extends around the igniter such that during the ignition period about two-thirds of the exhaust gas is bypassed around the igniter and one-third passes through the igniter. The igniter raises the temperature of the exhaust gases passing therethrough to an adiabatic temp…
- Date Issued:
- 2002-08-06
- Record Visibility:
- Public
- Title
- Method and Apparatus for treating exhaust gases
- Description
- An exhaust gas treatment system and method for treating the exhaust gas of an internal combustion engine includes a catalytic converter and a catalytic preheater or igniter upstream of the catalytic converter. A bypass passage extends around the igniter such that during the ignition period about two-thirds of the exhaust gas is bypassed around the igniter and one-third passes through the igniter. The igniter raises the temperature of the exhaust gases passing therethrough to an adiabatic temperature of about 900.degree. K. Accordingly, the flow through the igniter combined with the flow through the bypass passage raises the average temperature of the combined exhaust gases to approximately 700.degree. K., which is sufficient to ignite the catalytic converter at substantially the leading edge thereof. Accordingly, normal convective flow of the exhaust gases through the catalytic converter assists in propagating ignition of the converter. A temperature sensor in the catalytic converter causes a controller to operate a valve to divert substantially all of the exhaust gas flow through the bypass passage after the catalytic converter has ignited.
- Creator
- Hsueh-Chia Chang, David T. Leighton
- Publisher
- United States Patent and Trademark Office
- Language
- eng
- Rights
- http://creativecommons.org/publicdomain/zero/1.0/
- Resource Type
- Patent
-
- Inventor(s):
- Hsueh-Chia Chang, Shau-Chun Paul Wang, Dmitri Lastochkin, Leslie Yeo, Zachary Gagnon
- Patent Number:
- US 8267914 B1
- Description:
The present invention provides an electrospray device using a high frequency alternating current (AC) above 10 kHz to generate fine micron sized drops. The apparatus generally functions by applying a high frequency alternating current electric field across one or more micro-needles and one or more conducting elements. The present invention may be used to generate aerosol drops for respiratory drug delivery or as a microencapsulation technique for the encapsulation of drugs, DNA, protein, oste…
- Date Issued:
- 2012-09-18
- Record Visibility:
- Public
- Title
- Method and apparatus for AC electrospray
- Description
- The present invention provides an electrospray device using a high frequency alternating current (AC) above 10 kHz to generate fine micron sized drops. The apparatus generally functions by applying a high frequency alternating current electric field across one or more micro-needles and one or more conducting elements. The present invention may be used to generate aerosol drops for respiratory drug delivery or as a microencapsulation technique for the encapsulation of drugs, DNA, protein, osteogenic or dermatological growth factors, bacteria, viruses, immobilized enzyme receptors and fluorescent particles for controlled release drug delivery, tissue or bone engineering, clinical or environmental field testing and as biosensors for clinical or drug monitoring. In addition, the present invention may be used to synthesize biodegradable fibers as bioscaffolds for tissue engineering, surgical sutures or medical gauze that enhance blood coagulation, and further may be encapsulated by other agents.
- Creator
- Hsueh-Chia Chang, Shau-Chun Paul Wang, Dmitri Lastochkin, Leslie Yeo, Zachary Gagnon
- Publisher
- United States Patent and Trademark Office
- Language
- eng
- Rights
- http://creativecommons.org/publicdomain/zero/1.0/
- Resource Type
- Patent
-
- Inventor(s):
- Hsueh-Chia Chang, Zilin Chen, Fu-Chih Hsu, David Battigelli
- Patent Number:
- US 7960180 B2
- Description:
Methods and apparatus to capture and release microbe particles using amino-functionalized silica substrates are described. An example apparatus adapted to capture a microbe particle includes a silica substrate and a positively charged material to at least partially coat the silica substrate. The positive charged material includes an aminopropyl functional group.
- Date Issued:
- 2011-06-14
- Record Visibility:
- Public
- Title
- Methods and apparatus to capture and release microbe particles using amino-functionalized silica
- Description
- Methods and apparatus to capture and release microbe particles using amino-functionalized silica substrates are described. An example apparatus adapted to capture a microbe particle includes a silica substrate and a positively charged material to at least partially coat the silica substrate. The positive charged material includes an aminopropyl functional group.
- Creator
- Hsueh-Chia Chang, Zilin Chen, Fu-Chih Hsu, David Battigelli
- Publisher
- United States Patent and Trademark Office
- Language
- eng
- Rights
- http://creativecommons.org/publicdomain/zero/1.0/
- Resource Type
- Patent
-
- Inventor(s):
- Zachary Gagnon, Hsueh-Chia Chang
- Patent Number:
- US 7744738 B2
- Description:
The present invention provides a method and apparatus for use in rapid particle transportation, separation, focusing, characterization, and release. Dielectrophoresis and electro-osmotic driven fluid convection are used independently or in tandem as the driving forces for particle manipulation and on occasion characterization. Although dielectrophoresis has been acknowledged for decades as a powerful technique for particle manipulation and characterization, long processing times and measureme…
- Date Issued:
- 2010-06-29
- Record Visibility:
- Public
- Title
- Method and apparatus for rapid particle manipulation and characterization
- Description
- The present invention provides a method and apparatus for use in rapid particle transportation, separation, focusing, characterization, and release. Dielectrophoresis and electro-osmotic driven fluid convection are used independently or in tandem as the driving forces for particle manipulation and on occasion characterization. Although dielectrophoresis has been acknowledged for decades as a powerful technique for particle manipulation and characterization, long processing times and measurement inaccuracies that emerge from using disjointed electrodes have limited its usefulness in diagnostic kits. The present invention provides for a continuous wire that enables fluid flow patterns and dielectrophoretic forces with optimal configurations for rapid and sensitive particle manipulation and characterization.
- Creator
- Zachary Gagnon, Hsueh-Chia Chang
- Publisher
- United States Patent and Trademark Office
- Language
- eng
- Rights
- http://creativecommons.org/publicdomain/zero/1.0/
- Resource Type
- Patent