Patents by Inventor Chang-Hyung CHOI
Chang-Hyung 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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Publication number: 20190344237Abstract: The present invention generally relates to microparticles and, in particular, to systems and methods for encapsulation within microparticles. In one aspect, the present invention is generally directed to microparticles containing entities therein, where the entities contain an agent that can be released from the microparticles, e.g., via diffusion. In some cases, the agent may be released from the microparticles without disruption of the microparticles. The entities may be, for instance, polymeric particles, hydrogel particles, droplets of fluid, etc. The entities may be contained within a fluid that is, in turn, encapsulated within the microparticle. The agent may be released from the entity into the fluid, and then from the fluid through the microparticle. In such fashion, the release of agent from the microparticle may be controlled, e.g., over relatively long time scales.Type: ApplicationFiled: July 29, 2019Publication date: November 14, 2019Inventors: John Christopher Wesner, Marco Caggioni, Taotao Zhu, David A. Weitz, Alireza Abbaspourrad, Chang-Hyung Choi
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Patent number: 10434485Abstract: The present invention generally relates to microparticles and, in particular, to systems and methods for encapsulation within microparticles. In one aspect, the present invention is generally directed to microparticles containing entities therein, where the entities contain an agent that can be released from the microparticles, e.g., via diffusion. In some cases, the agent may be released from the microparticles without disruption of the microparticles. The entities may be, for instance, polymeric particles, hydrogel particles, droplets of fluid, etc. The entities may be contained within a fluid that is, in turn, encapsulated within the microparticle. The agent may be released from the entity into the fluid, and then from the fluid through the microparticle. In such fashion, the release of agent from the microparticle may be controlled, e.g., over relatively long time scales.Type: GrantFiled: June 28, 2017Date of Patent: October 8, 2019Assignees: The Procter & Gamble Company, President and Fellows of Harvard CollegeInventors: John Christopher Wesner, Marco Caggioni, Taotao Zhu, David A Weitz, Alireza Abbaspourrad, Chang-Hyung Choi
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Patent number: 9878299Abstract: The present invention generally relates to microparticles and, in particular, to systems and methods for encapsulation within microparticles. In one aspect, the present invention is generally directed to microparticles containing entities therein, where the entities contain an agent that can be released from the microparticles, e.g., via diffusion. In some cases, the agent may be released from the microparticles without disruption of the microparticles. The entities may be, for instance, polymeric particles, hydrogel particles, droplets of fluid, etc. The entities may be contained within a fluid that is, in turn, encapsulated within the microparticle. The agent may be released from the entity into the fluid, and then from the fluid through the microparticle. In such fashion, the release of agent from the microparticle may be controlled, e.g., over relatively long time scales.Type: GrantFiled: November 19, 2015Date of Patent: January 30, 2018Assignees: The Procter & Gamble Company, President and Fellows of Harvard CollegeInventors: John Christopher Wesner, Marco Caggioni, Taotao Zhu, David A Weitz, Alireza Abbaspourrad, Chang-Hyung Choi
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Publication number: 20170319443Abstract: The present invention generally relates to microfluidic droplets and, in particular, to multiple emulsion microfluidic droplets. In one set of embodiments, multiple emulsion droplets are provided, where an inner shell of the droplet is relatively thin, compared to the outer shell (or other shells) of the droplet. For instance, in one set of embodiments, the inner droplet has an average thickness of less than about 1000 nm. In some cases, the inner shell may be rigidified, e.g., to form a gel or a polymeric layer. This may be useful, for example, for preventing coalescence of fluids within the microfluidic droplet. Other embodiments of the present invention are generally directed to methods of making such droplets, methods of using such droplets, microfluidic devices for making such droplets, and the like.Type: ApplicationFiled: November 19, 2015Publication date: November 9, 2017Applicants: President and Fellows of Harvard College, The Procter & Gamble CompanyInventors: David A. Weitz, Alireza Abbaspourrad, Chang-Hyung Choi, Hyomin Lee, Marco Caggioni, John Christopher, Taotao Zhu
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Publication number: 20170296996Abstract: The present invention generally relates to microparticles and, in particular, to systems and methods for encapsulation within microparticles. In one aspect, the present invention is generally directed to microparticles containing entities therein, where the entities contain an agent that can be released from the microparticles, e.g., via diffusion. In some cases, the agent may be released from the microparticles without disruption of the microparticles. The entities may be, for instance, polymeric particles, hydrogel particles, droplets of fluid, etc. The entities may be contained within a fluid that is, in turn, encapsulated within the microparticle. The agent may be released from the entity into the fluid, and then from the fluid through the microparticle. In such fashion, the release of agent from the microparticle may be controlled, e.g., over relatively long time scales.Type: ApplicationFiled: June 28, 2017Publication date: October 19, 2017Inventors: John Christopher Wesner, Marco Caggioni, Taotao Zhu, David A. Weitz, Alireza Abbaspourrad, Chang-Hyung Choi
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Patent number: 9718044Abstract: The present invention generally relates to microparticles and, in particular, to systems and methods for encapsulation within microparticles. In one aspect, the present invention is generally directed to microparticles containing entities therein, where the entities contain an agent that can be released from the microparticles, e.g., via diffusion. In some cases, the agent may be released from the microparticles without disruption of the microparticles. The entities may be, for instance, polymeric particles, hydrogel particles, droplets of fluid, etc. The entities may be contained within a fluid that is, in turn, encapsulated within the microparticle. The agent may be released from the entity into the fluid, and then from the fluid through the microparticle. In such fashion, the release of agent from the microparticle may be controlled, e.g., over relatively long time scales.Type: GrantFiled: November 19, 2015Date of Patent: August 1, 2017Assignee: The Procter & Gamble CompanyInventors: John Christopher Wesner, Marco Caggioni, Taotao Zhu, David A Weitz, Alireza Abbaspourrad, Chang-Hyung Choi
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Publication number: 20160145535Abstract: The present invention generally relates to microparticles and, in particular, to systems and methods for encapsulation within microparticles. In one aspect, the present invention is generally directed to microparticles containing entities therein, where the entities contain an agent that can be released from the microparticles, e.g., via diffusion. In some cases, the agent may be released from the microparticles without disruption of the microparticles. The entities may be, for instance, polymeric particles, hydrogel particles, droplets of fluid, etc. The entities may be contained within a fluid that is, in turn, encapsulated within the microparticle. The agent may be released from the entity into the fluid, and then from the fluid through the microparticle. In such fashion, the release of agent from the microparticle may be controlled, e.g., over relatively long time scales.Type: ApplicationFiled: November 19, 2015Publication date: May 26, 2016Inventors: John Christopher Wesner, Marco Caggioni, Taotao Zhu, David A. Weitz, Alireza Abbaspourrad, Chang-Hyung Choi
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Publication number: 20160144330Abstract: The present invention generally relates to microparticles and, in particular, to systems and methods for encapsulation within microparticles. In one aspect, the present invention is generally directed to microparticles containing entities therein, where the entities contain an agent that can be released from the microparticles, e.g., via diffusion. In some cases, the agent may be released from the microparticles without disruption of the microparticles. The entities may be, for instance, polymeric particles, hydrogel particles, droplets of fluid, etc. The entities may be contained within a fluid that is, in turn, encapsulated within the microparticle. The agent may be released from the entity into the fluid, and then from the fluid through the microparticle. In such fashion, the release of agent from the microparticle may be controlled, e.g., over relatively long time scales.Type: ApplicationFiled: November 19, 2015Publication date: May 26, 2016Inventors: John Christopher Wesner, Marco Caggioni, Taotao Zhu, David A. Weitz, Alireza Abbaspourrad, Chang-Hyung Choi
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Publication number: 20160144329Abstract: The present invention generally relates to microparticles and, in particular, to systems and methods for encapsulation within microparticles. In one aspect, the present invention is generally directed to microparticles containing entities therein, where the entities contain an agent that can be released from the microparticles, e.g., via diffusion. In some cases, the agent may be released from the microparticles without disruption of the microparticles. The entities may be, for instance, polymeric particles, hydrogel particles, droplets of fluid, etc. The entities may be contained within a fluid that is, in turn, encapsulated within the microparticle. The agent may be released from the entity into the fluid, and then from the fluid through the microparticle. In such fashion, the release of agent from the microparticle may be controlled, e.g., over relatively long time scales.Type: ApplicationFiled: November 19, 2015Publication date: May 26, 2016Inventors: John Christopher Wesner, Marco Caggioni, Taotao Zhu, David A Weitz, Alireza Abbaspourrad, Chang-Hyung Choi
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Publication number: 20100187705Abstract: A method for preparing microcapsules using a droplet-based microfluidic chip. Monodisperse microcapsules, which are hollow or can be loaded with a desired material, are prepared using a droplet-based microfluidic chip through the movement of a monomer molecule from the inside of droplets to the interface of droplets, the diffusion of a photoinitiator to the interface of droplets, and the suppression of radical activity by oxygen in droplets. The method involves the use of a simple microfluidic channel and selectively photopolymerizing the shell of the droplets without needing the use of a chemically treated microfluidic channel or a complex microfluidic channel.Type: ApplicationFiled: July 23, 2009Publication date: July 29, 2010Applicant: The Industry & Academic Cooperation in Chungnam National University (IAC)Inventors: Chang-Soo LEE, Chang-Hyung CHOI