Patents by Inventor Insung S. Choi
Insung S. Choi 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: 11465118Abstract: A composition for stably preparing a hollow particle by a coacervation method, a hollow particle prepared using a composition for preparing a hollow particle, and a method of preparing a hollow particle are disclosed. A mono-disperse hollow particle is stably provided by excellent coacervate forming capability, such that it is expected to be beneficially used as a carrier in various fields such as a cosmetic, a paint, plastic, rubber, a synthetic wood, a refractory material, and an agricultural chemical.Type: GrantFiled: October 11, 2019Date of Patent: October 11, 2022Assignee: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Insung S. Choi, Hojae Lee, Won Il Kim
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Publication number: 20220184576Abstract: A composition for stably preparing a hollow particle by a coacervation method, a hollow particle prepared using a composition for preparing a hollow particle, and a method of preparing a hollow particle are disclosed. A mono-disperse hollow particle is stably provided by excellent coacervate forming capability, such that it is expected to be beneficially used as a carrier in various fields such as a cosmetic, a paint, plastic, rubber, a synthetic wood, a refractory material, and an agricultural chemical.Type: ApplicationFiled: October 11, 2019Publication date: June 16, 2022Inventors: Insung S. CHOI, Hojae LEE, Won II KIM
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Publication number: 20200114330Abstract: A composition for stably preparing a hollow particle by a coacervation method, a hollow particle prepared using a composition for preparing a hollow particle, and a method of preparing a hollow particle are disclosed. A mono-disperse hollow particle is stably provided by excellent coacervate forming capability, such that it is expected to be beneficially used as a carrier in various fields such as a cosmetic, a paint, plastic, rubber, a synthetic wood, a refractory material, and an agricultural chemical.Type: ApplicationFiled: October 11, 2019Publication date: April 16, 2020Inventors: Insung S. CHOI, Hojae LEE, Won II KIM
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Patent number: 8541621Abstract: Provided is a method for modifying a surface of a cyclic olefin copolymer, comprising: coating a compound of the following Chemical Formula 1 on the surface of a cyclic olefin copolymer substrate, irradiating UV light on the cyclic olefin copolymer substrate, and polymerizing a monomer on the cyclic olefin where X is H or F, and n is an integer of 1 to 6.Type: GrantFiled: September 9, 2009Date of Patent: September 24, 2013Assignee: Electronics and Telecommunications Research InstituteInventors: Dong-Ho Shin, Insung S. Choi, Sung Min Kang, Seung Pyo Jeong, Jinkyu Kim, Bokyung Kong
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Patent number: 7942160Abstract: The present invention relates to microfluidic systems, including valves and pumps for microfluidic systems. The valves of the invention include check valves such as diaphragm valves and flap valves. Other valves of the invention include one-use valves. The pumps of the present invention include a reservoir and at least two check valves. The reservoir may be of variable volume. The present invention also relates to a flexible microfluidic system. The present invention additionally relates to a method of making microfluidic systems including those of the present invention. The method includes forming a microfluidic system on a master, connecting a support to the microfluidic system and removing the microfluidic system from the master. The support may remain connected to the microfluidic system or the microfluidic system may be transferred to another substrate. The present invention further relates to a method of manipulating a flow of a fluid in a microfluidic system.Type: GrantFiled: June 14, 2004Date of Patent: May 17, 2011Assignee: President and Fellows of Harvard CollegeInventors: Noo Li Jeon, Daniel T. Chiu, Christopher J. Wargo, Insung S. Choi, Hongkai Wu, Janelle R. Anderson, George M. Whitesides, J. Cooper McDonald, Steven J. Metallo, Howard A. Stone
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Publication number: 20100143735Abstract: Provided is a method for modifying a surface of a cyclic olefin copolymer, comprising: coating a compound of the following Chemical Formula 1 on the surface of a cyclic olefin copolymer substrate, irradiating UV light on the cyclic olefin copolymer substrate, and polymerizing a monomer on the cyclic olefin where X is H or F, and n is an integer of 1 to 6.Type: ApplicationFiled: September 9, 2009Publication date: June 10, 2010Applicants: Electronics and Telecommunications Research Institute, Korea Advanced Institute of Science and TechnologyInventors: Dong-Ho Shin, Insung S. Choi, Sung Min Kang, Seung Pyo Jeong, Jinkyu Kim, Bokyung Kong
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Patent number: 7642075Abstract: Disclosed is a process of preparing a biodegradable polymer using an enzyme catalyst and a biodegradable polymer prepared through the process. The process includes polycondensing a polyhydric alcohol monomer having a secondary hydroxyl functional group and an acid monomer having a dicarboxylic group in the presence of the enzyme catalyst. Since the biodegradable polymer according to the present invention is polymerized using an enzyme in the course of the polycondensation, it is easily prepared and friendly to nature, and it is possible to control the molecular weight by varying the reaction time in the course of the polymerization. Thus, the biodegradable polymer is usefully applied to control the dose of a drug in a drug release system and is useful as a supporter for regenerating a desired biological tissue of a patient in tissue engineering.Type: GrantFiled: October 27, 2004Date of Patent: January 5, 2010Assignee: Korea Advanced Institute of Science and TechnologyInventors: Insung S. Choi, Kuk Ro Yoon
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Patent number: 7314070Abstract: A method and apparatus for treating a fluid. A method for treating a fluid may include combining two or more separate streams into a common stream and then splitting the common stream into a new set of separate streams wherein the separate streams may possess different properties. The separate streams may be combined to produce a gradient, such as a concentration gradient or shear gradient. The apparatus of the invention may provide a network of fluidic channels that may be used to manipulate a fluid to produce, for example, a gradient or a series of solutions containing a substance at varying concentrations.Type: GrantFiled: January 18, 2005Date of Patent: January 1, 2008Assignee: President and Fellows of Harvard CollegeInventors: Noo Li Jeon, Stephan K. W. Dertinger, Daniel T. Chiu, Insung S. Choi, George M. Whitesides
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Patent number: 7267938Abstract: The present invention describes improved microfluidic systems and procedures for fabricating improved microfluidic systems, which contain one or more levels of microfluidic channels. The methods for fabrication the systems disclosed can provide a convenient route to topologically complex and improved microfluidic systems. The microfluidic systems can include three-dimensionally arrayed networks of fluid flow paths therein including channels that cross over or under other channels of the network without physical intersection at the points of cross over. The microfluidic networks can be fabricated via replica molding processes utilizing mold masters including surfaces having topological features formed by photolithography. The present invention also involves microfluidic systems and methods for fabricating complex patterns of materials, such as biological materials and cells, on surfaces utilizing the microfluidic systems.Type: GrantFiled: September 2, 2003Date of Patent: September 11, 2007Assignee: President and Fellows of Harvard CollegeInventors: Janelle R. Anderson, Daniel T. Chiu, Noo Li Jeon, Sui Huang, Ravindra Kane, Insung S. Choi, Donald E. Ingber, George M. Whitesides
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Patent number: 6883559Abstract: A method and apparatus for treating a fluid. A method for treating a fluid may include combining two or more separate streams into a common stream and then splitting the common stream into a new set of separate streams wherein the separate streams may possess different properties. The separate streams may be combined to produce a gradient, such as a concentration gradient or shear gradient. The apparatus of the invention may provide a network of fluidic channels that may be used to manipulate a fluid to produce, for example, a gradient or a series of solutions containing a substance at varying concentrations.Type: GrantFiled: October 21, 2003Date of Patent: April 26, 2005Assignee: President and Fellows of Harvard CollegeInventors: Noo Li Jeon, Stephan K. W. Dertinger, Daniel T. Chiu, Insung S. Choi, George M. Whitesides
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Publication number: 20040228734Abstract: The present invention relates to microfluidic systems, including valves and pumps for microfluidic systems. The valves of the invention include check valves such as diaphragm valves and flap valves. Other valves of the invention include one-use valves. The pumps of the present invention include a reservoir and at least two check valves. The reservoir may be of variable volume. The present invention also relates to a flexible microfluidic system. The present invention additionally relates to a method of making microfluidic systems including those of the present invention. The method includes forming a microfluidic system on a master, connecting a support to the microfluidic system and removing the microfluidic system from the master. The support may remain connected to the microfluidic system or the microfluidic system may be transferred to another substrate. The present invention further relates to a method of manipulating a flow of a fluid in a microfluidic system.Type: ApplicationFiled: June 14, 2004Publication date: November 18, 2004Applicant: PRESIDENT AND FELLOWS OF HARVARD COLLEGEInventors: Noo Li Jeon, Daniel T. Chiu, Christopher J. Wargo, Insung S. Choi, Hongkai Wu, Janelle R. Anderson, George M. Whitesides, Justin C. McDonald, Steven J. Metallo, Howard A. Stone
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Patent number: 6767194Abstract: The present invention relates to microfluidic systems, including valves and pumps for microfluidic systems. The valves of the invention include check valves such as diaphragm valves and flap valves. Other valves of the invention include one-use valves. The pumps of the present invention include a reservoir and at least two check valves. The reservoir may be of variable volume. The present invention also relates to a flexible microfluidic system. The present invention additionally relates to a method of making microfluidic systems including those of the present invention. The method includes forming a microfluidic system on a master, connecting a support to the microfluidic system and removing the microfluidic system from the master. The support may remain connected to the microfluidic system or the microfluidic system may be transferred to another substrate. The present invention further relates to a method of manipulating a flow of a fluid in a microfluidic system.Type: GrantFiled: January 8, 2002Date of Patent: July 27, 2004Assignee: President and Fellows of Harvard CollegeInventors: Noo Li Jeon, Daniel T. Chiu, Christopher J. Wargo, Insung S. Choi, Hongkai Wu, Janelle R. Anderson, George M. Whitesides, Justin C. McDonald, Steven J. Metallo, Howard A. Stone
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Publication number: 20040129336Abstract: A method and apparatus for treating a fluid. A method for treating a fluid may include combining two or more separate streams into a common stream and then splitting the common stream into a new set of separate streams wherein the separate streams may possess different properties. The separate streams may be combined to produce a gradient, such as a concentration gradient or shear gradient. The apparatus of the invention may provide a network of fluidic channels that may be used to manipulate a fluid to produce, for example, a gradient or a series of solutions containing a substance at varying concentrations.Type: ApplicationFiled: October 21, 2003Publication date: July 8, 2004Applicant: President and Fellows of Harvard CollegeInventors: Noo Li Jeon, Stephan K.W. Dertinger, Daniel T. Chiu, Insung S. Choi, George M. Whitesides
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Publication number: 20040121066Abstract: The present invention describes improved microfluidic systems and procedures for fabricating improved microfluidic systems, which contain one or more levels of microfluidic channels. The methods for fabrication the systems disclosed can provide a convenient route to topologically complex and improved microfluidic systems. The microfluidic systems can include three-dimensionally arrayed networks of fluid flow paths therein including channels that cross over or under other channels of the network without physical intersection at the points of cross over. The microfluidic networks can be fabricated via replica molding processes utilizing mold masters including surfaces having topological features formed by photolithography. The present invention also involves microfluidic systems and methods for fabricating complex patterns of materials, such as biological materials and cells, on surfaces utilizing the microfluidic systems.Type: ApplicationFiled: September 2, 2003Publication date: June 24, 2004Applicants: President and Fellows of Harvard College, Children's Medical Center CorporationInventors: Janelle R. Anderson, Daniel T. Chiu, Noo-Li Jeon, Sui Huang, Ravi Kane, Insung S. Choi, Donald E. Ingber, George M. Whitesides
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Patent number: 6705357Abstract: A method and apparatus for treating a fluid. A method for treating a fluid may include combining two or more separate streams into a common stream and then splitting the common stream into a new set of separate streams wherein the separate streams may possess different properties. The separate streams may be combined to produce a gradient, such as a concentration gradient or shear gradient. The apparatus of the invention may provide a network of fluidic channels that may be used to manipulate a fluid to produce, for example, a gradient or a series of solutions containing a substance at varying concentrations.Type: GrantFiled: September 18, 2001Date of Patent: March 16, 2004Assignee: President and Fellows of Harvard CollegeInventors: Noo Li Jeon, Stephan K. W. Dertinger, Daniel T. Chiu, Insung S. Choi, George M. Whitesides
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Patent number: 6686184Abstract: Microfluidic systems and methods are provided for fabricating complex patterns of materials, such as proteins, inorganic materials or cells, on surfaces. Complex, discontinuous patterns on surfaces can be formed incorporating or depositing multiple materials. A stamp structure has a flow path containing a series of interconnected channels. The channels include a first channel within an interior of the stamp structure, a second channel within a stamping surface of the structure defining a pattern, and a channel fluidically interconnecting the first and second channels. After contacting the stamp with a surface, a fluid is introduced into the flow path so that the fluid contacts the surface to form a pattern. In another embodiment, the stamp structure has two non-fluidically interconnected first and second flow paths defining first and second patterns of channels to produce non-continuous first and second patterns on a surface.Type: GrantFiled: May 25, 2000Date of Patent: February 3, 2004Assignees: President and Fellows of Harvard College, Children's Medical Center CorporationInventors: Janelle R. Anderson, Daniel T. Chiu, Noo-Li Jeon, Sui Huang, Ravi Kane, Insung S. Choi, Donald E. Ingber, George M. Whitesides
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Publication number: 20020168278Abstract: The present invention relates to microfluidic systems, including valves and pumps for microfluidic systems. The valves of the invention include check valves such as diaphragm valves and flap valves. Other valves of the invention include one-use valves. The pumps of the present invention include a reservoir and at least two check valves. The reservoir may be of variable volume. The present invention also relates to a flexible microfluidic system. The present invention additionally relates to a method of making microfluidic systems including those of the present invention. The method includes forming a microfluidic system on a master, connecting a support to the microfluidic system and removing the microfluidic system from the master. The support may remain connected to the microfluidic system or the microfluidic system may be transferred to another substrate. The present invention further relates to a method of manipulating a flow of a fluid in a microfluidic system.Type: ApplicationFiled: January 8, 2002Publication date: November 14, 2002Inventors: Noo Li Jeon, Daniel T. Chiu, Christopher J. Wargo, Insung S. Choi, Hongkai Wu, Janelle R. Anderson, George M. Whitesides, Justin C. McDonald, Steven J. Metallo, Howard A. Stone
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Publication number: 20020113095Abstract: A method and apparatus for treating a fluid. A method for treating a fluid may include combining two or more separate streams into a common stream and then splitting the common stream into a new set of separate streams wherein the separate streams may possess different properties. The separate streams may be combined to produce a gradient, such as a concentration gradient or shear gradient. The apparatus of the invention may provide a network of fluidic channels that may be used to manipulate a fluid to produce, for example, a gradient or a series of solutions containing a substance at varying concentrations.Type: ApplicationFiled: September 18, 2001Publication date: August 22, 2002Inventors: Noo Li Jeon, Stephan K.W. Dertinger, Daniel T. Chiu, Insung S. Choi, George M. Whitesides