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).

  • Publication number: 20130302733
    Abstract: A liquid electrophotographic ink is disclosed herein. One example of the liquid electrophotographic ink includes a non-polar carrier liquid; pigmented toner particles; a charge director; and polymer resin encapsulated metal oxide nanoparticles. A method for making the liquid electrophotographic ink is also disclosed herein.
    Type: Application
    Filed: January 31, 2011
    Publication date: November 14, 2013
    Inventors: Doris Pik-Yiu Chun, Hou T. Ng, Albert Teishev
  • Publication number: 20130288175
    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: April 25, 2012
    Publication date: October 31, 2013
    Inventors: Doris Chun, Quang P. Lam, Hou T. Ng
  • Publication number: 20130288171
    Abstract: The present disclosure is drawn to electrostatic printing. In an example, a coated photoconductive substrate can comprise a photoconductive substrate, the photoconductive substrate including a substrate having a charge generation layer and charge transport layer adhered thereto; and a top coating adhered to the photoconductive substrate. The top coating can comprise a cross-linkable polymer, a cross-linker, and a charge transport material, where the charge transport material is dispersed throughout the top coating and may be present in the top coating in an amount ranging from 20 wt % to 50 wt %.
    Type: Application
    Filed: April 30, 2012
    Publication date: October 31, 2013
    Inventors: Sivapackia Ganapathiappan, Krzysztof Nauka, Hou T. Ng
  • Publication number: 20130288177
    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: Application
    Filed: April 26, 2012
    Publication date: October 31, 2013
    Inventors: Sivapackia Ganapathiappan, Hou T. Ng, Albert Teishev
  • Publication number: 20130288017
    Abstract: The present disclosure is drawn to compositions and methods involving coated substrates for liquid electrophotographic printing. Generally, a coated substrate for liquid electrophotographic printing can comprise a polyethylene- or polypropylene-based substrate and a coating adhered to the substrate, the coating comprising a water-based aliphatic polyurethane polymer.
    Type: Application
    Filed: April 25, 2012
    Publication date: October 31, 2013
    Inventors: Sivapackia Ganapathiappan, Hou T. Ng, Eric Hoarau
  • Publication number: 20130288176
    Abstract: An ink is disclosed. The ink includes a carrier fluid; an encapsulated metallic pigment particle further including a metallic pigment particle and a polymer, wherein the polymer covers between 70% and 100%, inclusive, of the surface area of the metallic pigment particle and wherein the morphology of the metallic pigment particle by itself is substantially the same as the morphology of the metallic pigment particle covered by the polymer; and a polymer resin.
    Type: Application
    Filed: April 30, 2012
    Publication date: October 31, 2013
    Inventors: Sivapackia Ganapathiappan, Hou T. Ng, Albert Teishev
  • Patent number: 8562125
    Abstract: A concentrated inkjet ink for packaging includes a liquid composition present in an amount that is less than 60 wt % of the concentrated inkjet ink, and nonvolatile solids present in an amount ranging from about 40 wt % to about 90 wt % of the concentrated inkjet ink. The nonvolatile solids include encapsulated pigment particles having a particle size ranging from about 50 nm to about 500 nm, and a dispersant. The concentrated inkjet ink is dispersible in an ink vehicle to form a print ready inkjet ink.
    Type: Grant
    Filed: April 23, 2013
    Date of Patent: October 22, 2013
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Doris Pik-Yiu Chun, Thomas Anthony, Hou T. Ng, Howard S. Tom
  • Patent number: 8563210
    Abstract: A liquid electrophotographic ink concentrate includes non-volatile solids present in an amount ranging from about 20% to about 70% of the ink concentrate, the non-volatile solids including encapsulated pigment particles having a particle size ranging from about 500 nm to about 20 ?m, and a viscosity modifier. The ink concentrate includes a balance of a liquid composition, the liquid composition including a carrier. The concentrate is dispersible in an ink vehicle to form a print-ready liquid electrophotographic ink having the non-volatile solids present in an amount ranging from about 0.5% to 5% of the print-ready liquid electrophotographic ink.
    Type: Grant
    Filed: April 18, 2013
    Date of Patent: October 22, 2013
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Doris Pik-Yiu Chun, Sivapackia Ganapathiappan, Hou T. Ng, Albert Teishev
  • Patent number: 8536267
    Abstract: Methods of surface modification of polymer particle are useful in the development of marking fluids. The surface modification includes saponifying one or more acrylic ester groups on a surface of the polymer particle.
    Type: Grant
    Filed: September 11, 2009
    Date of Patent: September 17, 2013
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Doris Pik-Yiu Chun, Hou T. Ng
  • Publication number: 20130183619
    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: Application
    Filed: January 18, 2012
    Publication date: July 18, 2013
    Inventors: Sivapackia Ganapathiappan, Hou T. Ng, Albert Teishev
  • Publication number: 20130137027
    Abstract: An organic photoconductor includes an inner charge generation layer for generating charges and an outer charge transport layer for facilitating charge transport. The charge transport layer comprises a semi-interpenetrating hole-transport polymer or oligomer network in which the polymer or oligomer is cross-linked. A process for forming a charge transport layer in an organic photoconductor is also provided.
    Type: Application
    Filed: November 30, 2011
    Publication date: May 30, 2013
    Inventors: Zhang-Lin Zhou, Krzysztof Nauka, Hou T. Ng
  • Patent number: 8450037
    Abstract: A method for making a photoconductor for electrophotography can comprise depositing a charge generating layer on an electrode; depositing a charge transfer layer on the charge generating layer, where a plurality of charge transfer molecules are disposed within the charge transfer layer; depositing a film of non-conducting material onto the surface of the charge-transfer layer; heating the film and the surface to cause a subset of the charge transfer molecules to move into the non-conducting material, creating in the film a conducting sub-layer and an insulating sub-layer, where the insulating sub-layer is substantially free of charge transfer molecules.
    Type: Grant
    Filed: March 12, 2009
    Date of Patent: May 28, 2013
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Krzysztof Nauka, Xia Sheng, Hou T. Ng
  • Patent number: 8430494
    Abstract: An ink forming method involves preparing a deagglomerated ink or a modified deagglomerated ink. The deagglomerated ink or the modified deagglomerated ink includes at least deagglomerated colorant particles and a liquid component. The deagglomerated colorant particles are chosen from pigment particles each encapsulated with a dispersant. The colorant particles have a particle size ranging from about 50 nm to about 500 nm. Prior to shipping and/or storing the deagglomerated ink or the modified deagglomerated ink, a portion of the liquid component is removed to form a concentrated ink that has a nonvolatile solids content ranging from about 40 wt % to about 90 wt % of the concentrated ink.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: April 30, 2013
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Doris Pik-Yiu Chun, Thomas Anthony, Hou T. Ng, Howard S. Tom
  • Patent number: 8426100
    Abstract: Liquid electrophotographic ink concentrates and methods of preparing the same are disclosed herein. An example of the method includes preparing a mixture of ink components using a first predetermined thermal profile. The ink components include a resin, a pigment, and a carrier. The method further includes preparing a microfluidizer with a composition at a temperature within a predetermined range and processing the mixture in the prepared microfluidizer to form the concentrate. Processing the mixture includes pressure-feeding the mixture into the prepared microfluidizer, passing the mixture through the prepared microfluidizer for a predetermined number of times, and utilizing a second predetermined thermal profile while passing the mixture through the prepared microfluidizer. A viscosity modifier is added to the mixture before and/or during the processing of the mixture.
    Type: Grant
    Filed: January 31, 2011
    Date of Patent: April 23, 2013
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Doris Pik-Yiu Chun, Sivapackia Ganapathiappan, Hou T. Ng, Albert Teishev
  • Publication number: 20130038665
    Abstract: A printing system (30, 40, 40?, 50, 50?) includes at least one ejector coupled to a reservoir (38) that is configured to contain a printing composition including a hydrocarbon having at least one unsaturated bond. The hydrocarbon is configured to at least one of polymerize or crosslink in the presence of a reactive species. The at least one ejector is configured to eject the printing composition onto a surface (34, 36, 10). The system (30, 40, 40?, 50, 50?) further includes a corona generator (32, 32?, 32?, 32?) configured to generate the reactive species in situ. The corona generator (32, 32?, 32?, 32?) is positioned with respect to the reservoir (38) such that the reactive species is exposed to the printing composition after the printing composition has been ejected onto the surface (34, 36, 10). The polymerizing and/or the cross-linking of the hydrocarbon is configured to form a polymer matrix (12) from the ejected printing composition.
    Type: Application
    Filed: April 30, 2010
    Publication date: February 14, 2013
    Inventors: Doris Pik-Yiu Chun, Henryk Birecki, Hou T. NG
  • Publication number: 20130041069
    Abstract: A digital printing composition includes a carrier and a colorant. The carrier includes a hydrocarbon having at least one unsaturated bond. The hydrocarbon is configured to at least one of polymerize or crosslink in the presence of a charged species produced from a corona generator.
    Type: Application
    Filed: April 30, 2010
    Publication date: February 14, 2013
    Applicant: Hewlettt-Packard Development Company, L.P.
    Inventors: Doris Pik-Yiu Chun, Hou T. Ng
  • Patent number: 8372494
    Abstract: An inkjet print medium includes a base substrate, a layer of a deinking solution at least partially diffused into the base substrate, and an ink-receiving layer established on the layer of the deinking solution. The deinking solution includes a flocculant in an amount ranging from about 0.1 wt. % to about 40 wt. % of a total wt. % of the deinking solution.
    Type: Grant
    Filed: October 29, 2009
    Date of Patent: February 12, 2013
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Laurie S. Mittelstadt, Manoj K. Bhattacharyya, Hou T. Ng
  • Publication number: 20130029111
    Abstract: A post-treatment composition for a digitally printed image includes a non-polar solvent and a non-ionic surfactant. The non-ionic surfactant is present in an amount ranging from about 0.5 wt % to about 20 wt % of a total weight of substrate used to form the digitally printed image. The post-treatment composition renders the digitally printed image deinkable.
    Type: Application
    Filed: July 29, 2011
    Publication date: January 31, 2013
    Inventors: Manoj K. Bhattacharyya, Hou T. Ng, Laurie S. Mittelstadt
  • Publication number: 20130026683
    Abstract: The present disclosure is drawn toward compositions, systems, and methods for printing of three-dimensional objects. In one embodiment, a liquid inkjettable material for 3-dimensional printing can comprise from 0.1 wt % to 10 wt % of a pigment, from 10 wt % to 90 wt % of a UV-curable polymer, and from 0.1 wt % to 70 wt % of a polymeric filler. Additionally, the liquid inkjettable material can be jettable from piezo electric inkjet printer nozzles and has acceptable decap performance measured by jetting a normal 50 picoliter ink drop within 10 electric firing pulses after the piezo electric inkjet printer nozzles have been fired and have been subsequently rested for 24 hours.
    Type: Application
    Filed: July 28, 2011
    Publication date: January 31, 2013
    Inventors: Hou T. Ng, Doris Chun
  • Patent number: 8356893
    Abstract: Ink composition including non-VOC liquid carrier and method of making the same are disclosed. A disclosed example ink composition has a viscosity that is below about 70.0 cps and includes non-VOC liquid carrier, dispersing agents and pigment particles having an average size of less than about 10 ?m. Also disclosed are method of use and method of making such ink composition containing non-VOC liquid carrier.
    Type: Grant
    Filed: April 1, 2010
    Date of Patent: January 22, 2013
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Doris Pik-Yiu Chun, Howard S. Tom, Hou T. Ng