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).

  • Publication number: 20160122506
    Abstract: A process for making a latex emulsion, where the process involves dissolving resin in a biosolvent that hydrolyzes on exposure to water.
    Type: Application
    Filed: October 29, 2014
    Publication date: May 5, 2016
    Inventors: Shigeng Li, Chieh-Min Cheng
  • Publication number: 20160124331
    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: Application
    Filed: November 5, 2014
    Publication date: May 5, 2016
    Inventors: Steven M. Malachowski, Eric Joseph Young, Linda Jan, Eric David Godshall, Brian J. Marion, Chieh-Min Cheng
  • Patent number: 9321899
    Abstract: A process for making a latex emulsion, where the process involves dissolving resin in a biosolvent that hydrolyzes on exposure to water.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: April 26, 2016
    Assignee: XEROX CORPORATION
    Inventors: Shigeng Li, Chieh-Min Cheng
  • Patent number: 9298117
    Abstract: Methods herein include mixing at least one polyester resin with at least one solvent to form a resin mixture, adding water to cause phase inversion and form a polyester latex, adding at least one buffering agent to the phase inverted mixture to stabilize the phase inverted mixture, and subsequent to the buffering agent addition, substantially removing the at least one solvent from the phase inverted mixture.
    Type: Grant
    Filed: January 28, 2014
    Date of Patent: March 29, 2016
    Assignee: XEROX CORPORATION
    Inventors: Zhen Lai, Chieh-Min Cheng
  • Patent number: 9280076
    Abstract: A toner includes a core including a homogenized mixture of a first polyester latex, a styrene/acrylate latex, and a compatibilizing agent latex that includes a graft polyester-styrene/acrylate copolymer and a shell that includes a polyester latex. A process includes (1) homogenizing a mixture to form a plurality of core particles, the mixture including a first polyester latex, a styrene/acrylate latex, and a compatibilizing agent latex comprising a graft polyester-styrene/acrylate copolymer and (2) adding a shell polyester latex to the plurality of core particles to form a plurality of core-shell structures.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: March 8, 2016
    Assignee: XEROX CORPORATION
    Inventors: Shigeng Li, Christopher Michael Wolfe, Yanjia Zuo, Randy Pheav Tin, John L. Pawlak, Jay Lee Schneider, Peter Nguyen, Jordan Frank, Chieh-Min Cheng
  • Patent number: 9280075
    Abstract: A process includes dissolving a styrene/acrylate resin in an organic solvent to form a first solution, dissolving at least one polyester resin in the first solution to form a second solution, neutralizing the second solution with a base to provide a neutralized solution, and adding a sufficient amount of water to the neutralized solution to form an emulsion. A latex particle includes a polyester resin and a styrene/acrylate resin dispersed within the latex particle, the surface of the latex particle is substantially the polyester resin. A toner includes a plurality of toner particles prepared from a latex, the particles of the latex including a polyester resin and a styrene/acrylate resin dispersed within each latex particle, the surface of each latex particle is substantially the polyester resin.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: March 8, 2016
    Assignee: XEROX CORPORATION
    Inventors: Yanjia Zuo, Yulin Wang, Shigeng Li, Peter Nguyen, Chieh-Min Cheng, John L. Pawlak
  • Patent number: 9267032
    Abstract: A process for making a crystalline latex emulsion suitable for use in toner using phase invention emulsification (PIE) where solvent is reused is presented.
    Type: Grant
    Filed: November 6, 2014
    Date of Patent: February 23, 2016
    Assignee: Xerox Corporation
    Inventors: Shigeng Li, Yanjia Zuo, Shigang Qiu, Peter V Nguyen, Amy A Grillo, Steven M Malachowski, Chieh-Min Cheng
  • Publication number: 20160004175
    Abstract: A process for making a latex emulsion where distillation occurs at an elevated temperature is used to make resin particles with a conditioned surface which can be used to make magenta toner with increased efficiency.
    Type: Application
    Filed: July 1, 2014
    Publication date: January 7, 2016
    Inventors: Shigeng Li, Christopher M. Wolfe, Randy P Tin, Eric Godshall, Shigang Qiu, Peter V Nguyen, Jay L Schneider, Linda S Schriever, Steven M Malachowski, Amy A Grillo, Chieh-Min Cheng
  • Patent number: 9223238
    Abstract: A process is disclosed for making a resin emulsion suitable for use in forming toner particles including using a wiped film evaporator for removing residual solvents.
    Type: Grant
    Filed: June 18, 2013
    Date of Patent: December 29, 2015
    Assignee: Xerox Corporation
    Inventors: Amy A Grillo, Shigang Qiu, Peter V Nguyen, Chieh-Min Cheng
  • Patent number: 9223237
    Abstract: A process for attaching additives onto toner particles using plasma is described.
    Type: Grant
    Filed: December 10, 2013
    Date of Patent: December 29, 2015
    Assignee: Xerox Corporation
    Inventors: Joo T Chung, Steven M Malachowski, Chieh-Min Cheng, Shigeng Li
  • Patent number: 9201321
    Abstract: A phase inversion emulsification process includes dissolving a polyester resin in a mixture comprising (1) an organic solvent, (2) a first portion of a total amount of neutralizing agent, and (3) a first portion of water, neutralizing the dissolved polyester resin with a second portion of neutralizing agent, the second portion of neutralizing agent including the remaining amount of the total amount neutralizing agent, forming an emulsion by adding a second portion of water after the neutralizing step, and removing a portion of the organic solvent from the emulsion to provide a latex.
    Type: Grant
    Filed: June 17, 2013
    Date of Patent: December 1, 2015
    Assignee: XEROX CORPORATION
    Inventors: Shigang Steven Qiu, Chieh-Min Cheng, Amy Grillo, Yulin Wang, Rashid Mahmood, David Kurceba
  • Publication number: 20150286156
    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 4, 2014
    Publication date: October 8, 2015
    Applicant: XEROX CORPORATION
    Inventors: Shigeng Li, Shigang Qiu, Peter Van Nguyen, Amy Avolia Grillo, Chieh-Min Cheng
  • Patent number: 9104123
    Abstract: A washing process using one or more ionic liquids (ILs) as a washing aid agent for toners, including toners produced using such ILs, such as, low melt toners, is provided. ILs are environmentally sound, green solvents that act to swell toner particle surfaces so that surface absorbed and adsorbed pollutants, such as, surfactants and other manufacturing reactants, can be effectively removed. The resulting toners have good charging, charge maintenance and RH sensitivity.
    Type: Grant
    Filed: April 29, 2013
    Date of Patent: August 11, 2015
    Assignee: Xerox Corporation
    Inventors: Zhen Lai, Chieh-Min Cheng, Zhaoyang Ou
  • Patent number: 9090760
    Abstract: 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: Grant
    Filed: April 4, 2013
    Date of Patent: July 28, 2015
    Assignee: Xerox Corporation
    Inventors: Joo T. Chung, Chieh-Min Cheng
  • Publication number: 20150168858
    Abstract: A process for making a latex emulsion suitable for use in a toner composition which applies the model of Brinkman to predict phase inversion point (PIP) during phase invention emulsification (PIE), including using this model to calculate the amount of water needed to complete the phase inversion for solvent reuse formulation.
    Type: Application
    Filed: December 16, 2013
    Publication date: June 18, 2015
    Applicant: Xerox Corporation
    Inventors: Shigeng Li, Shigang Qiu, Peter V. Nguyen, Linda S. Schriever, Amy A. Grillo, Chieh-Min Cheng
  • Publication number: 20150160575
    Abstract: A process for attaching additives onto toner particles using plasma is described.
    Type: Application
    Filed: December 10, 2013
    Publication date: June 11, 2015
    Applicant: Xerox Corporation
    Inventors: Joo T. Chung, Steven M Malachowski, Chieh-Min Cheng, Shigeng Li
  • Patent number: 9052625
    Abstract: 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: Grant
    Filed: March 15, 2013
    Date of Patent: June 9, 2015
    Assignee: XEROX CORPORATION
    Inventors: Joo T. Chung, Chieh-Min Cheng, Steven M. Malachowski, Eric David Godshall, Jim Lee Pearson
  • Publication number: 20150144179
    Abstract: A solar cell module includes a solar panel, a first frame strip, a second frame strip, and a connecting member. The first frame strip and the second frame strip are both assembled at the edges of the solar panel. The connecting member includes two top wind plates, a bottom wind plate, a connecting web, and two connecting terminal portions. A gap is formed between the two top wind plates. The connecting web is connected to the two top wind plates and the bottom wind plate, and has a breach and at least one corner. The breach and the gap form a drainage ditch to expose a corner of the solar panel. The two connecting terminal portions extend from the connecting web, so as to be detachably connected to the first frame strip and the second frame strip via the two connecting terminal portions.
    Type: Application
    Filed: May 13, 2014
    Publication date: May 28, 2015
    Applicant: AU Optronics Corporation
    Inventors: Yung-Chih CHEN, Huang-Chi TSENG, Chieh-Min CHENG, Wen-Yuan LIAO
  • Publication number: 20150141572
    Abstract: A process includes dissolving a first polymer in an aprotic solvent, absent a protic organic solvent, to form a polymer solution, neutralizing acidic residues present in the first polymer by adding a neutralizing agent to the polymer solution, contacting the polymer solution with water to form a latex, removing the aprotic solvent from the latex, capturing the removed aprotic solvent as recycled solvent, and dissolving a second polymer with the recycled solvent.
    Type: Application
    Filed: November 20, 2013
    Publication date: May 21, 2015
    Applicant: Xerox Corporation
    Inventors: Shigeng Li, Shigang S. Qiu, Peter Nguyen, Amy Grillo, Chieh-Min Cheng
  • Publication number: 20150125621
    Abstract: The disclosure relates to processes of preparing coated carrier particles by means of plasma activation and apparatus for use thereof.
    Type: Application
    Filed: November 4, 2013
    Publication date: May 7, 2015
    Applicant: XEROX CORPORATION
    Inventors: Joo T. Chung, Bernard A. Kelly, Brian S. Giannetto, Chieh-Min Cheng, Thomas C. Dombroski