Patents by Inventor Chieh-Min Cheng

Chieh-Min Cheng 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).

  • Patent number: 9798255
    Abstract: A process is provided comprising forming a phase inversed resin emulsion comprising a resin, water, and an organic solvent, wherein the process excludes subjecting the phase inversed resin emulsion to an organic solvent removal technique, thereby retaining the organic solvent in the phase inversed resin emulsion. The phase inversed resin emulsion may be formed by dissolving a resin in an organic solvent to form a resin mixture; optionally, adding a neutralizing agent to the resin mixture to neutralize acid groups on the resin; and adding a sufficient amount of water to the resin mixture to emulsify and induce phase inversion in the resin mixture. Also provided are processes for preparing particles and processes for preparing toners utilizing the phase inversed resin emulsions.
    Type: Grant
    Filed: June 9, 2016
    Date of Patent: October 24, 2017
    Assignee: Xerox Corporation
    Inventors: Yulin Wang, Shigang S. Qiu, Chieh-Min Cheng, Kathryne S. Brockman
  • Patent number: 9798257
    Abstract: A method for removing volatile organic compounds (VOC's) from toner slurries is described, including the isolated toner particles generated by that method.
    Type: Grant
    Filed: December 3, 2015
    Date of Patent: October 24, 2017
    Assignee: Xerox Corporation
    Inventors: Matthew W Croteau, Mark A Jackson, Roger B B Keeble, Harold R Judd, Munir Salman, Vincenzo G Marcello, Chieh-Min Cheng, Steven M Malachowski, Grazyna Kmiecik-Lawrynowicz, Linda S Schriever
  • Publication number: 20170192370
    Abstract: 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: Application
    Filed: March 21, 2017
    Publication date: July 6, 2017
    Inventors: Joo T. Chung, Chieh-Min Cheng, Steven M. Malachowski, Eric Joseph Young, Eric David Godshall, Brian Joseph Marion
  • Publication number: 20170192371
    Abstract: 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: Application
    Filed: March 21, 2017
    Publication date: July 6, 2017
    Inventors: Joo T. Chung, Chieh-Min Cheng, Steven M. Malachowski, Eric Joseph Young, Eric David Godshall, Brian Joseph Marion
  • Publication number: 20170160659
    Abstract: A method for removing volatile organic compounds (VOC's) from toner slurries is described, including the isolated toner particles generated by that method.
    Type: Application
    Filed: December 3, 2015
    Publication date: June 8, 2017
    Inventors: Matthew W Croteau, Mark A Jackson, Roger BB Keeble, Harold R Judd, Munir Salman, Vincenzo G Marcello, Chieh-Min Cheng, Steven M Malachowski, Grazyna Kmiecik-Lawrynowicz, Linda S Schriever
  • Publication number: 20170130044
    Abstract: The present disclosure describes poly(styrene/acrylate)-polyester hybrid particles, wherein poly(styrene/acrylate) polymers are polymerized and entangled within a polyester seed particle in an interpenetrating polymer network.
    Type: Application
    Filed: November 10, 2015
    Publication date: May 11, 2017
    Inventors: Yanjia Zuo, Shigeng Li, Robert D. Bayley, Peter V. Nguyen, Linda S. Schriever, Gregory K. Thompson, Chieh-Min Cheng
  • Patent number: 9639013
    Abstract: 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: Grant
    Filed: April 4, 2013
    Date of Patent: May 2, 2017
    Assignee: XEROX Corporation
    Inventors: Joo T. Chung, Chieh-Min Cheng, Steven M. Malachowski, Eric Joseph Young, Eric David Godshall, Brian Joseph Marion
  • Patent number: 9562142
    Abstract: A process for making a crystalline latex suitable for use in a toner by phase inversion emulsification (PIE) where when resin of particular acid number is neutralized to a certain degree, smaller sized resin particles are obtained reproducibly.
    Type: Grant
    Filed: May 8, 2015
    Date of Patent: February 7, 2017
    Assignee: Xerox Corporation
    Inventors: Yanjia Zuo, Shigeng Li, Peter V Nguyen, Chieh-Min Cheng
  • Publication number: 20160362538
    Abstract: A process directed to emulsion polymerization (EP) methods for producing seed particles reproducibly independent of initiator amount and rate of introduction.
    Type: Application
    Filed: June 11, 2015
    Publication date: December 15, 2016
    Inventors: Shigeng Li, Yanjia Zuo, Chieh-Min Cheng
  • Publication number: 20160326338
    Abstract: A process for making a crystalline latex suitable for use in a toner by phase inversion emulsification (PIE) where when resin of particular acid number is neutralized to a certain degree, smaller sized resin particles are obtained reproducibly.
    Type: Application
    Filed: May 8, 2015
    Publication date: November 10, 2016
    Inventors: Yanjia Zuo, Shigeng Li, Peter V Nguyen, Chieh-Min Cheng
  • Patent number: 9464173
    Abstract: A process for making a latex by phase inversion emulsification in an agitated reactor column is described.
    Type: Grant
    Filed: December 16, 2014
    Date of Patent: October 11, 2016
    Assignee: Xerox Corporation
    Inventors: Shigang Qiu, David J W Lawton, Chieh-min Cheng
  • Publication number: 20160274478
    Abstract: Porous resin particles of from about 3 ?m to about 25 ?m size made in an emulsion aggregation process where coalescence occurs under continuous conditions which enable, for example, more rapid coalescence, are described.
    Type: Application
    Filed: June 2, 2016
    Publication date: September 22, 2016
    Inventors: David J.W. Lawton, Chieh-Min Cheng, David R. Kurceba, Eric J. Young
  • Patent number: 9428622
    Abstract: A phase inversion emulsification process includes dissolving a polyester resin and a styrene/acrylate resin in an organic solvent to provide a solution, neutralizing the solution with a neutralizing agent, forming an emulsion by adding water after the neutralizing step and removing a portion of the organic solvent from the emulsion to provide a latex.
    Type: Grant
    Filed: April 24, 2015
    Date of Patent: August 30, 2016
    Assignee: XEROX CORPORATION
    Inventors: Yanjia Zuo, Shigeng Li, Chieh-Min Cheng, John L. Pawlak
  • Publication number: 20160246191
    Abstract: The disclosure provides robust phase inversion emulsification (PIE) processes, which produces polyester latex particles having particle size distributions with high centering capability indexes (Cpk), for the preparation of toners of good quality.
    Type: Application
    Filed: April 29, 2016
    Publication date: August 25, 2016
    Inventors: Shigeng Li, Shigang Qiu, Peter Van Nguyen, Amy Avolia Grillo, Chieh-Min Cheng
  • Patent number: 9410037
    Abstract: A process for making a crystalline latex suitable for use in a toner by phase inversion emulsification (PIE) where the liquid reagents, such as, organic solvent(s), neutralizing agent and water, are reused from a prior PIE.
    Type: Grant
    Filed: December 5, 2014
    Date of Patent: August 9, 2016
    Assignee: Xerox Corporation
    Inventors: Shigeng Li, Yanjia Zuo, Shigang Qiu, Peter V Nguyen, Chieh-Min Cheng
  • Patent number: 9400440
    Abstract: The present disclosure describes toner particles that have polyester resin and styrene/acrylate resin in the core.
    Type: Grant
    Filed: December 5, 2014
    Date of Patent: July 26, 2016
    Assignee: Xerox Corporation
    Inventors: Christopher M Wolfe, Chieh-Min Cheng, Eric J Young, Randy P Tin, Jay L Schneider, Joo T Chung
  • Patent number: 9372421
    Abstract: In an exemplary embodiment of the invention, a continuous process for rounding conventional toner particles includes forming a conventional toner particle slurry by mixing a dispersant and/or a liquid with dry toner particles, heating the conventional toner particle slurry to a first temperature beyond its glass transition temperature to form a coalesced toner particle slurry, quenching the coalesced toner particle slurry to a second temperature below the glass transition temperature after a residence time has elapsed, and recovering the quenched particle slurry at an outlet wherein the circularity of the conventional toner particles in the quenched toner particle slurry is from approximately 0.940 to 0.999 and the time frame for the heating, quenching and recovering steps is less than 20 minutes.
    Type: Grant
    Filed: November 5, 2014
    Date of Patent: June 21, 2016
    Assignee: XEROX CORPORATION
    Inventors: Steven M. Malachowski, Eric Joseph Young, Linda Jan, Eric David Godshall, Brian J. Marion, Chieh-Min Cheng
  • Publication number: 20160168337
    Abstract: A process for making a latex by phase inversion emulsification in an agitated reactor column is described.
    Type: Application
    Filed: December 16, 2014
    Publication date: June 16, 2016
    Inventors: Shigang Qiu, David JW Lawton, Chieh-min Cheng
  • Patent number: 9366980
    Abstract: A process for making colored polyester latex by phase inversion emulsification is described.
    Type: Grant
    Filed: November 13, 2014
    Date of Patent: June 14, 2016
    Assignee: Xerox Corporation
    Inventors: Shigeng Li, Peter V Nguyen, Judith M Vandewinckel, Amy A Grillo, Chieh-Min Cheng
  • Patent number: 9366979
    Abstract: The disclosure provides robust phase inversion emulsification (PIE) processes, which produces polyester latex particles having particle size distributions with high centering capability indexes (Cpk), for the preparation of toners of good quality.
    Type: Grant
    Filed: April 4, 2014
    Date of Patent: June 14, 2016
    Assignee: XEROX CORPORATION
    Inventors: Shigeng Li, Shigang Qiu, Peter Van Nguyen, Amy Avolia Grillo, Chieh-Min Cheng