Patents by Inventor Hou T. Ng

Hou T. Ng 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).

  • MICRO-COMPOSITE MATERIAL FOR THREE-DIMENSIONAL PRINTING
    Publication number: 20140212532
    Abstract: The present disclosure provides a micro-composite material used in the fabrication of three-dimensional objects, and associated methods and systems. In one example, a micro-composite material used in the fabrication of a three-dimensional object can comprise micronized polymeric particles; a photocurable curing agent; and a dye present in the micro-composite material in an amount at from 0.0001 wt % to 0.1 wt %, the dye having a ?max between 350 nm and 800 nm.
    Type: Application
    Filed: January 28, 2013
    Publication date: July 31, 2014
    Applicant: Hewlett-Packard Development Company, L.P.
    Inventors: Sivapackia Ganapathiappan, Krzysztof Nauka, Hou T. Ng
  • Ink composition and method of preparing same
    Patent number: 8791174
    Abstract: An ink composition includes a particulate pigment, a hydrocarbon vehicle, an organic polyamine and an organic polyacid. A ratio by weight percent of the organic polyamine to the organic polyacid in the hydrocarbon vehicle is sufficient to render a conductivity of the ink composition to equal to or less than 15 nanosiemens per centimeter. The ink composition is prepared by combining the particulate pigment with a composition that includes the hydrocarbon vehicle, the organic polyamine and the organic polyacid. The combination is subjected to conditions under which the particulate pigment becomes dispersed in the composition.
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: July 29, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Doris Pik-Yiu Chun, Hou T. Ng
  • Method of making a pigment dispersion
    Patent number: 8772372
    Abstract: A method for making a pigment dispersion can include dispersing pigment particles in an aqueous liquid medium to form a dispersion, adding a first monomer to form a dispersive coating on the pigment particles, adding a second monomer to the dispersion, and forming a polymer coating on the surface of the pigment particles by polymerizing the second monomer with the first monomer, wherein the polymer coating includes at least one urethane linkage or urea linkage.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: July 8, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Sivapackia Ganapathiappan, Howard S. Tom, Hou T. Ng
  • Single batch latex ink compositions and methods
    Patent number: 8772369
    Abstract: The present disclosure provides methods and composition directed towards a single batch latex ink-jet ink. In one embodiment, a method of manufacturing a single batch latex ink-jet ink can comprise emulsifying a pigment and a monomer in a solvent, and polymerizing the monomer with a reaction condition sufficient to encapsulate the pigment and sufficient to form individual latex particulates thereby forming a single batch latex ink-jet ink. The ink can contain less than about 0.5 wt % of latex particulates having a diameter of 50 nm or less, can contain about 1 wt % to about 10 wt % of latex particulates having a diameter of about 100 nm to about 250 nm and can contain about 3 wt % to about 5 wt % of encapsulated pigment.
    Type: Grant
    Filed: December 4, 2009
    Date of Patent: July 8, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Doris Pik-Yiu Chun, Hou T. Ng
  • Liquid toner including latex particles
    Patent number: 8765348
    Abstract: A liquid toner is disclosed herein. The liquid toner includes a toner composition with latex particles incorporated therein. The toner composition includes charged toner particles incorporated into a non-polar liquid carrier. The latex particles are polymer particles of acrylic monomers, vinylic monomers, or mixtures thereof, and each latex particle has a particle size ranging from about 20 nm to about 5 ?m.
    Type: Grant
    Filed: January 18, 2012
    Date of Patent: July 1, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Sivapackia Ganapathiappan, Hou T. Ng, Albert Teishev
  • Ink dispersion
    Patent number: 8764894
    Abstract: An ink dispersion includes an ink vehicle and a colorant dispersed in the ink vehicle. The ink vehicle includes a non-ionic surfactant and a solvent. The non-ionic surfactant has an HLB value ranges from about 5 to about 16, and is chosen from: i) a material represented by one of the formulas R1—O—(OR2)n—H, R1—(OR2)n—OH or R1—C6H4—(OR2)n—OH, wherein: R1 is chosen from a) a linear or cyclic alkyl group including from 3 to 20 carbon atoms, or b) a substituted or non-substituted alkyl group including from 6 to 18 carbon atoms, R2 is chosen from CH2CH2 or CH2CH2CH2, and n is an integer chosen from 2 to 100; or ii) a diester having at least one ethylene oxide repeating unit; or iii) an octylphenol having at least one ethylene oxide repeating unit.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: July 1, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Hou T. Ng, Manoj K. Bhattacharyya, Howard S. Tom
  • INKS FOR LIQUID ELECTROPHOTOGRAPHY
    Publication number: 20140162186
    Abstract: A method of manufacturing a liquid electrophotographic ink includes: mixing a pigment with a resin powder; and microfluidizing the mixture together with a carrier fluid in a microfluidizer in a number of passes to form a concentrated ink containing composite particles.
    Type: Application
    Filed: February 11, 2014
    Publication date: June 12, 2014
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Sivapackia GANAPATHIAPPAN, Hou T. Ng, Albert Teishev
  • DEINKABLE LIQUID TONER
    Publication number: 20140147172
    Abstract: A deinkable liquid toner is disclosed herein. The deinkable liquid toner includes a non-polar carrier fluid, a styrene-alkyl acrylate, and a colorant. The styrene-alkyl acrylate has a glass transition temperature ranging from about 65 C to about 100 C. A method for making the deinkable liquid toner and a printing system are also disclosed herein.
    Type: Application
    Filed: July 26, 2011
    Publication date: May 29, 2014
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Hou T. Ng, Sivapackia Ganapathiappan, Albert Teishev
  • LIQUID ELECTROPHOTOGRAPHIC INKS
    Publication number: 20140147783
    Abstract: A liquid electrophotographic ink is disclosed. The liquid electrophotographic ink includes a carrier liquid, a polymer resin, and a pearlescent pigment particle.
    Type: Application
    Filed: November 20, 2013
    Publication date: May 29, 2014
    Inventors: Doris Chun, Hou T. Ng, Quang P. Lam
  • Multi-component filters
    Patent number: 8734651
    Abstract: An apparatus for conducting single-pass filtration of ink waste is disclosed. The apparatus includes: a filter connected to a housing unit and a plurality of absorbent layers within the housing unit, wherein the plurality of absorbent layers are in any order and include: a layer for removing metal and polar compounds, a layer for removing non-polar color impurities, a layer for removing acid functional components, a layer for removing additives with polar or protic functional groups, and a layer for removing residual water. A process and a system that include or utilize the apparatus are also disclosed.
    Type: Grant
    Filed: February 9, 2011
    Date of Patent: May 27, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Doris Pik-Yiu Chun, Hou T. Ng
  • Inkjet ink and intermediate transfer medium for inkjet printing
    Patent number: 8714731
    Abstract: An inkjet ink and an intermediate transfer medium for inkjet printing are disclosed herein. During inkjet printing, the inkjet ink forms ink drops having a contact angle (?) of less than or equal to 50° on the intermediate transfer medium, where the contact angle (?) reduces or substantially eliminates coalescence of adjacent ink drops. The contact angle (?) may be obtained by controlling a property of the inkjet ink and/or a property of the surface of the intermediate transfer medium.
    Type: Grant
    Filed: July 31, 2009
    Date of Patent: May 6, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Sui-hing Leung, Hou T. Ng
  • Polymer-encapsulated colorant nanoparticles
    Patent number: 8709600
    Abstract: A polymer-encapsulated colorant nanoparticle includes a colorant nanoparticle core, and a polymer coating established on the colorant nanoparticle core. A negatively chargeable functional group is present on a surface of the polymer-encapsulated colorant nanoparticle.
    Type: Grant
    Filed: July 5, 2010
    Date of Patent: April 29, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Doris Pik-Yiu Chun, Hou T. Ng
  • INKJET INK WITH NON-SWELLABLE LATEX PARTICLES
    Publication number: 20140098164
    Abstract: An inkjet ink includes a non-polar carrier, a colorant dispersed in the non-polar carrier, a dispersant, and non-swellable latex particles of a cross-linked polymer dispersed in the non-polar carrier. The colorant is chosen from a pigment, a dye, or a combination of a pigment and a dye. The cross-linked polymer consists of: an acrylic monomer having a molecular weight less than 1000, a vinylic monomer having a molecular weight of less than 1000, or combinations thereof.
    Type: Application
    Filed: October 4, 2012
    Publication date: April 10, 2014
    Applicant: Hewlett-Packard Development Company, L.P.
    Inventors: Hou T. Ng, Sivapackia Ganapathiappan, Howard S. Tom
  • Inks for liquid electrophotography
    Patent number: 8669037
    Abstract: A method of manufacturing a liquid electrophotographic ink includes: mixing a first portion of a carrier fluid and a resin to form a resin mixture; heating the resin mixture until the resin has melted; cooling the resin mixture to form a resin cake, followed by pulverizing the resin cake to form a resin powder; and mix the resin powder with a pigment and a second portion of carrier fluid in a microfluidizer to form a concentrating ink containing composite particles. An alternate method of manufacturing a liquid electrophotographic ink includes: mixing a pigment with a resin powder; and microfluidizing the mixture together with a carrier fluid in a microfluidizer in a number of passes to form a concentrated ink containing composite particles.
    Type: Grant
    Filed: April 26, 2012
    Date of Patent: March 11, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Sivapackia Ganapathiappan, Hou T. Ng, Albert Teishev
  • Method of forming ionically-charged, encapsulated colorant nanoparticles
    Patent number: 8653185
    Abstract: A method of forming ionically-charged, colorant nanoparticles involves forming in-situ ionically-charged polyurethane monomers, and forming an emulsion including the ionically-charged polyurethane monomers and a colorant nanoparticle. The method further involves polymerizing or crosslinking the ionically-charged polyurethane monomers in the emulsion, where the polymerizing or crosslinking chemically attaches the ionically-charged polyurethane monomers to a surface of the colorant nanoparticle to form an ionically-charged encapsulation layer on the surface.
    Type: Grant
    Filed: April 30, 2010
    Date of Patent: February 18, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Doris Pik-Yiu Chun, Hou T. Ng
  • Organic Photoconductors with Latex Polymer Overcoat Layers
    Publication number: 20140023963
    Abstract: An organic photoconductor includes: a conductive substrate; a charge generation layer on the conductive substrate; and a charge transport layer on the charge generation layer. An overcoat layer is formed on the charge transport layer. The overcoat layer is a latex polymer in which a charge transport material is dispersed.
    Type: Application
    Filed: July 19, 2012
    Publication date: January 23, 2014
    Inventors: Zhang-Lin Zhou, Krzystof Nauka, Lihua Zhao, Hou T. Ng
  • Ink coating composition
    Patent number: 8628183
    Abstract: An ink coating composition is disclosed herein. The ink coating composition includes a polymer latex and an adhesion promoting agent. A non-ionic surfactant is also included in the ink coating composition. The non-ionic surfactant has an HLB value ranging from about 6 to about 15. The ink coating composition also includes a balance of water.
    Type: Grant
    Filed: February 15, 2011
    Date of Patent: January 14, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Hou T. Ng, Wenjia Zhang
  • DYNAMICS SIMULATION
    Publication number: 20140005993
    Abstract: Dynamics simulations are described. Dynamics simulations can include identifying a number of ink related components and a number of printing interactions. Dynamics simulations can also include generating a granular representation of the number of ink related components and calculating a number of Hamaker constants based on the granular representation of the number of ink related components. Dynamics simulations can include performing a dynamics simulation based on the number of Hamaker constants, the granular representation of the number of ink related components, and the number of printing interactions.
    Type: Application
    Filed: June 27, 2012
    Publication date: January 2, 2014
    Inventors: Yan Zhao, Hou T. Ng
  • ORGANIC PHOTOCONDUCTORS AND METHODS OF MANUFACTURING THE SAME
    Publication number: 20130344424
    Abstract: Organic photoconductors and methods of manufacturing the same are disclosed. An example method to manufacture an organic photoconductor involves applying a liquid solution to a surface of a cylindrically-shaped substrate while rotating the substrate about its axis, the substrate comprising a surface layer and the liquid solution comprising a matrix polymer species and a dopant species dissolved in a solvent. The example method further involves rotating the substrate while the solvent evaporates to provide a substantially evenly distributed seamless residue film comprising the matrix polymer species and the dopant species, and cross-linking the matrix polymer species of the residue film.
    Type: Application
    Filed: June 22, 2012
    Publication date: December 26, 2013
    Inventors: Krzysztof Nauka, Anthony William McLennan, Hou T. Ng
  • EMULSION-BASED THERMAL INKJET INKS
    Publication number: 20130305958
    Abstract: Emulsion-based thermal inkjet inks include a high boiling point carrier fluid; a colorant; and vesicles comprising a low boiling point expellant fluid, and an ionic surfactant comprising molecules, each having a head with affinity to expellant fluid material and a tail with affinity to carrier fluid, the vesicles having a core defined by the heads of the surfactant molecules, the expellant fluid contained in the core, with the vesicles dispersed in the carrier fluid. A method for preparing the thermal inkjet inks is also disclosed.
    Type: Application
    Filed: January 31, 2011
    Publication date: November 21, 2013
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Henryk Birecki, Hou T. Ng, Howard S. Tom