Patents by Inventor Joo T. Chung
Joo T. Chung 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: 9874825Abstract: Processes for continuously coalescing particles from an aggregated particle slurry are disclosed. The aggregated particle slurry is heated, then coalesced by raising the pH. The coalesced particles are homogenized and exit as a coalesced particle slurry. A multi-screw extruder is used for the coalescing. These processes are useful for providing coalesced particles such as toner compositions.Type: GrantFiled: March 21, 2017Date of Patent: January 23, 2018Assignee: XEROX CORPORATIONInventors: Joo T. Chung, Chieh-Min Cheng, Steven M. Malachowski, Eric Joseph Young, Eric David Godshall, Brian Joseph Marion
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Publication number: 20170192371Abstract: Processes for continuously coalescing particles from an aggregated particle slurry are disclosed. The aggregated particle slurry is heated, then coalesced by raising the pH. The coalesced particles are homogenized and exit as a coalesced particle slurry. A multi-screw extruder is used for the coalescing. These processes are useful for providing coalesced particles such as toner compositions.Type: ApplicationFiled: March 21, 2017Publication date: July 6, 2017Inventors: Joo T. Chung, Chieh-Min Cheng, Steven M. Malachowski, Eric Joseph Young, Eric David Godshall, Brian Joseph Marion
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Publication number: 20170192370Abstract: Processes for continuously coalescing particles from an aggregated particle slurry are disclosed. The aggregated particle slurry is heated, then coalesced by raising the pH. The coalesced particles are homogenized and exit as a coalesced particle slurry. A multi-screw extruder is used for the coalescing. These processes are useful for providing coalesced particles such as toner compositions.Type: ApplicationFiled: March 21, 2017Publication date: July 6, 2017Inventors: Joo T. Chung, Chieh-Min Cheng, Steven M. Malachowski, Eric Joseph Young, Eric David Godshall, Brian Joseph Marion
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Patent number: 9639013Abstract: Processes for continuously coalescing particles from an aggregated particle slurry are disclosed. The aggregated particle slurry is heated, then coalesced by raising the pH. The coalesced particles are homogenized and exit as a coalesced particle slurry. A multi-screw extruder is used for the coalescing. These processes are useful for providing coalesced particles such as toner compositions.Type: GrantFiled: April 4, 2013Date of Patent: May 2, 2017Assignee: XEROX CorporationInventors: Joo T. Chung, Chieh-Min Cheng, Steven M. Malachowski, Eric Joseph Young, Eric David Godshall, Brian Joseph Marion
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Patent number: 9400440Abstract: The present disclosure describes toner particles that have polyester resin and styrene/acrylate resin in the core.Type: GrantFiled: December 5, 2014Date of Patent: July 26, 2016Assignee: Xerox CorporationInventors: Christopher M Wolfe, Chieh-Min Cheng, Eric J Young, Randy P Tin, Jay L Schneider, Joo T Chung
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Publication number: 20160161873Abstract: The present disclosure describes toner particles that have polyester resin and styrene/acrylate resin in the core.Type: ApplicationFiled: December 5, 2014Publication date: June 9, 2016Inventors: Christopher M. Wolfe, Chieh-Min Cheng, Eric J. Young, Randy P. Tin, Jay L. Schneider, Joo T. Chung
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Patent number: 9223237Abstract: A process for attaching additives onto toner particles using plasma is described.Type: GrantFiled: December 10, 2013Date of Patent: December 29, 2015Assignee: Xerox CorporationInventors: Joo T Chung, Steven M Malachowski, Chieh-Min Cheng, Shigeng Li
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Patent number: 9090760Abstract: Processes for continuously producing latex emulsions are disclosed. A multi-screw extruder is used for the production of the emulsion. A resin is fed into the extruder, heated, optionally dissolved in a solvent, mixed with a base to neutralize the resin and form particles, then mixed with a surfactant and water to form a phase inverted emulsion (PIE). The PIE may be sent to a distillation column to separate out the solvent, and the resulting latex emulsion is then sent to a receiving tank. These processes are useful for making precursors for toner compositions.Type: GrantFiled: April 4, 2013Date of Patent: July 28, 2015Assignee: Xerox CorporationInventors: Joo T. Chung, Chieh-Min Cheng
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Publication number: 20150160575Abstract: A process for attaching additives onto toner particles using plasma is described.Type: ApplicationFiled: December 10, 2013Publication date: June 11, 2015Applicant: Xerox CorporationInventors: Joo T. Chung, Steven M Malachowski, Chieh-Min Cheng, Shigeng Li
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Patent number: 9052625Abstract: A continuous process for making a pigment dispersion includes continuously feeding a pigment into a feed section of a screw extruder at a controlled rate, continuously feeding a surfactant into the feed section of the screw extruder at a controlled rate, continuously feeding water downstream of the feed section to emulsify the pigment and the surfactant, forming a water-in-pigment dispersion, continuously feeding additional water downstream of the previously fed water to cause a phase inversion of the water-in-pigment dispersion, forming a pigment-in-water dispersion, continuously homogenizing the pigment-in-water dispersion in the screw extruder to create a homogenous aqueous pigment dispersion and collecting the homogenous aqueous pigment dispersion from an exit section of the screw extruder.Type: GrantFiled: March 15, 2013Date of Patent: June 9, 2015Assignee: XEROX CORPORATIONInventors: Joo T. Chung, Chieh-Min Cheng, Steven M. Malachowski, Eric David Godshall, Jim Lee Pearson
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Publication number: 20150125621Abstract: The disclosure relates to processes of preparing coated carrier particles by means of plasma activation and apparatus for use thereof.Type: ApplicationFiled: November 4, 2013Publication date: May 7, 2015Applicant: XEROX CORPORATIONInventors: Joo T. Chung, Bernard A. Kelly, Brian S. Giannetto, Chieh-Min Cheng, Thomas C. Dombroski
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Publication number: 20140335451Abstract: The present embodiments relate to toner particles having an increased surface hardness, and toners comprising said toner particles. More specifically, the present embodiments relate to toner particles having an average surface hardness of from about 130 mPa to about 250 mPa, comprising a core surrounded by a shell, wherein the shell comprises a crystalline resin.Type: ApplicationFiled: May 8, 2013Publication date: November 13, 2014Applicant: XEROX CORPORATIONInventors: Joo T. Chung, Jay L. Schneider, Chieh-Min Cheng, Christopher Wolfe, Angela Schnuerch
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Publication number: 20140303298Abstract: Processes for continuously producing latex emulsions are disclosed. A multi-screw extruder is used for the production of the emulsion. A resin is fed into the extruder, heated, optionally dissolved in a solvent, mixed with a base to neutralize the resin and form particles, then mixed with a surfactant and water to form a phase inverted emulsion (PIE). The PIE may be sent to a distillation column to separate out the solvent, and the resulting latex emulsion is then sent to a receiving tank. These processes are useful for making precursors for toner compositions.Type: ApplicationFiled: April 4, 2013Publication date: October 9, 2014Applicant: Xerox CorporationInventors: Joo T. Chung, Chieh-Min Cheng
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Publication number: 20140302436Abstract: Processes for continuously producing a wax dispersion are disclosed. A multi-screw extruder is used for the processes. A wax and a surfactant are fed into the extruder and melted together. Water is then added to form a dispersion. The wax particles are homogenized and exit the extruder to be passed through a quenching unit. The wax dispersion can be used to make toner compositions.Type: ApplicationFiled: April 4, 2013Publication date: October 9, 2014Applicant: Xerox CorporationInventors: Joo T. Chung, Chieh-Min Cheng, Steven M. Malachowski, Eric David Godshall, Ronald Dean Werner
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Publication number: 20140302432Abstract: Processes for continuously coalescing particles from an aggregated particle slurry are disclosed. The aggregated particle slurry is heated, then coalesced by raising the pH. The coalesced particles are homogenized and exit as a coalesced particle slurry. A multi-screw extruder is used for the coalescing. These processes are useful for providing coalesced particles such as toner compositions.Type: ApplicationFiled: April 4, 2013Publication date: October 9, 2014Applicant: XEROX CORPORATIONInventors: Joo T. Chung, Chieh-Min Cheng, Steven M. Malachowski, Eric Joseph Young, Eric David Godshall, Brian Joseph Marion
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Patent number: 8685607Abstract: The continuous process for manufacturing toners disclosed herein includes continuously feeding components of a toner composition into a feed section of a screw extruder at a controlled rate. The continuous process for manufacturing toners may include feeding the components of a toner composition into the feed section of a screw extruder without performing an external or secondary dispersion step. That is to say, the components of the toner composition may be fed directly into the extruder without using dispersions of individual components as used in batch processes. Rather, the toner components are added to the extruder in dry form, melt-mixed, and may be dispersed in aqueous form in the extruder. The process may produce micron-sized toner particles, thus no further size reduction may be necessary.Type: GrantFiled: August 29, 2012Date of Patent: April 1, 2014Assignee: Xerox CorporationInventors: Joo T. Chung, Chieh-Min Cheng, Zhen Lai, Mark E. Mang, Eugene F. Young, Brian Andaya, Joseph Leonardo
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Publication number: 20140065537Abstract: The continuous process for manufacturing toners disclosed herein includes continuously feeding components of a toner composition into a feed section of a screw extruder at a controlled rate. The continuous process for manufacturing toners may include feeding the components of a toner composition into the feed section of a screw extruder without performing an external or secondary dispersion step. That is to say, the components of the toner composition may be fed directly into the extruder without using dispersions of individual components as used in batch processes. Rather, the toner components are added to the extruder in dry form, melt-mixed, and may be dispersed in aqueous form in the extruder. The process may produce micron-sized toner particles, thus no further size reduction may be necessary.Type: ApplicationFiled: August 29, 2012Publication date: March 6, 2014Applicant: XEROX CORPORATIONInventors: Joo T. CHUNG, Chieh-Min CHENG, Zhen LAI, Mark E. MANG, Eugene F. YOUNG, Brian ANDAYA, Joseph LEONARDO
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Patent number: 8652747Abstract: A continuous process for forming fine toner using a twin screw extruder.Type: GrantFiled: February 21, 2012Date of Patent: February 18, 2014Assignee: Xerox CorporationInventors: Joo T Chung, Chieh-Min Cheng, Zhen Lai
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Patent number: 8618192Abstract: A process for making a latex emulsion suitable for use in a toner composition includes contacting at least one amorphous polyester resin with a viscosity reducing additive in the absence of an organic solvent to form a resin mixture either via an extruder or batch process, and adding a surfactant, neutralizing agent, and deionized water to the resin mixture.Type: GrantFiled: February 5, 2010Date of Patent: December 31, 2013Assignee: Xerox CorporationInventors: Santiago Faucher, Joo T. Chung, Timothy L. Lincoln, Shigang Qiu, Yuhua Tong, Fumii Higuchi, Emine Irmak Serifoglu, Allan K. Chen, Brian J. Andaya, Joseph L. Leonardo
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Patent number: 8608367Abstract: A screw extruder is presented including a feed hopper for receiving materials and a body member having at least one supply port and at least one outlet port. The screw extruder also includes a screw positioned within the body member and movable along a channel defining a longitudinal axis. The screw extruder further includes a drive shaft for rotatably driving the screw along the channel. The screw extruder may be configured to mix the materials received via the feed hopper with a series of one or more forward, neutral, and reverse kneading elements.Type: GrantFiled: May 19, 2010Date of Patent: December 17, 2013Assignee: Xerox CorporationInventors: Joo T. Chung, Fumii Higuchi, Santiago Faucher, Joseph L. Leonardo, Brian Andaya