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: 20180093411
    Abstract: An apparatus for fabricating a polishing pad includes a conveyor belt, a casting station to form a layer of the polishing pad and to deliver the layer of the polishing pad onto the conveyor belt, a printing station including one or more printheads configured to deposit one or more layers to form a polishing pad, a motor to drive the conveyor belt, and an energy source. The one or more printheads include a plurality of nozzles configured to eject droplets of a liquid polishing pad material precursor on the layer formed by the casting station. The motor drives the conveyor belt while the one or more printheads eject the droplets such that droplets provide a layer of polishing pad material precursor. The energy source at least partially cure the pad material precursor to form a solidified layer of polishing pad material.
    Type: Application
    Filed: September 27, 2017
    Publication date: April 5, 2018
    Inventors: Hou T. Ng, Nag B. Patibandla, Sivapackia Ganapathiappan
  • Patent number: 9933715
    Abstract: The present disclosure is related to coated photoconductors. In an example, a coated photoconductor can comprise a photoconductor including a substrate having a charge generation layer and charge transport layer adhered thereto and a top coating adhered to the photoconductor.
    Type: Grant
    Filed: June 13, 2016
    Date of Patent: April 3, 2018
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Krzysztof Nauka, Zhang-Lin Zhou, Hou T. Ng
  • Publication number: 20180079153
    Abstract: An additive manufacturing apparatus includes a platform, a plurality of printheads supported above the platform and configured to dispense successive layers of feed material on a top surface of the platform, the layers of feed material to be formed into a polishing pad, an optical sensor to monitor a dispensing operation of a first printhead of the plurality of printheads, and a controller configured to detect an error condition associated with the first printhead based on monitoring the dispensing operation of the first printhead while operating the printheads to successively dispense the layers of feed material, and adjust a dispensing operation of a second printhead of the plurality of printheads in response to detecting the error condition.
    Type: Application
    Filed: April 21, 2017
    Publication date: March 22, 2018
    Inventors: Hou T. Ng, Nag B. Patibandla, Sivapackia Ganapathiappan
  • Publication number: 20180079152
    Abstract: An additive manufacturing apparatus for forming a polishing pad for chemical mechanical polishing includes a platform, an actuator system coupled to the platform to adjust a tilt of the platform, one or more printheads supported above the platform, the one or more printheads configured to dispense successive layers of feed material on the platform to be form the polishing pad, a sensing system to detect a height of a surface on or above the platform at each of a plurality of horizontally spaced points, and a controller configured to selectively operate the actuator system to adjust the tilt of the platform based on the detected height of the platform at each of the points such that the surface is moved closer to horizontal.
    Type: Application
    Filed: April 21, 2017
    Publication date: March 22, 2018
    Inventors: Hou T. Ng, Nag B. Patibandla, Sivapackia Ganapathiappan
  • Publication number: 20180079147
    Abstract: A method of additive manufacturing includes dispensing successive layers of feed material to form a polishing pad, and directing first and second radiation beams toward the layers of feed material to form a polishing pad. Dispensing each successive layer of the layers of feed material includes dispensing a drop of feed material, and directing the first and second radiation beams toward the layers of feed material includes, for each successive layer, directing the first radiation beam toward the drop of feed material to cure an exterior surface of the drop of feed material, and directing the second radiation beam toward the drop of feed material to cure an interior volume of the drop of feed material.
    Type: Application
    Filed: April 21, 2017
    Publication date: March 22, 2018
    Inventors: Hou T. Ng, Nag B. Patibandla, Sivapackia Ganapathiappan
  • Patent number: 9921511
    Abstract: In an example of a method for making polymer-encapsulated metallic ink pigment particles, a layer of a transparent resin dispersion is disposed on a flexible substrate. The resin dispersion layer is substantially dried, and a base resin layer is formed. A slurry is disposed onto the base resin layer. The slurry includes metallic pigment particles and polymer particles dispersed in a non-aqueous carrier. The slurry is dried to form a metallic pigment-polymer sheet. Another layer of the transparent resin dispersion is disposed on the metallic pigment-polymer sheet and is dried. A coating resin layer is formed. The metallic pigment-polymer sheet and the base and coating transparent resin layers form a tri-layer film having the metallic pigment particles encapsulated between the base and coating transparent resin layers.
    Type: Grant
    Filed: April 28, 2014
    Date of Patent: March 20, 2018
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Lihua Zhao, Yan Zhao, Doris Chun, Sivapackia Ganapathiappan, Hou T. Ng, Albert Teishev
  • Publication number: 20180072585
    Abstract: A method for manufacturing low effective density TiO2 includes providing a template having a surface. The template surface is coated with a titanium-containing compound that can be reduced to TiO2 at high temperature. The template is removed, thereby forming porous TiO2 particles. The effective density of the porous TiO2 particles is less than 4.
    Type: Application
    Filed: November 17, 2017
    Publication date: March 15, 2018
    Inventors: Yan Zhao, Howard S. Tom, Hou T. Ng
  • Patent number: 9914836
    Abstract: A coated silver colored colorant includes a silver colored pigment, and a primer polymer at least partially coating the silver colored pigment. The primer polymer has a glass transition temperature that is less than 40° C. A passivating polymer is attached to the primer polymer. The passivating polymer has a glass transition temperature that is greater than 40° C.
    Type: Grant
    Filed: April 29, 2014
    Date of Patent: March 13, 2018
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Sivapackia Ganapathiappan, Hou T. Ng, Albert Teishev
  • Publication number: 20180065297
    Abstract: In some examples, at least one agent distributor may be to selectively deliver mixtures of coalescing agent and carrier onto portions of a layer of build material at variable coalescing agent concentrations and variable contone densities. A controller may be to control the at least one agent distributor to selectively deliver the mixture to a portion of the layer at a selected coalescing agent concentration and a selected contone density.
    Type: Application
    Filed: May 15, 2015
    Publication date: March 8, 2018
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Lihua Zhao, Yan Zhao, Hou T. Ng
  • Publication number: 20180065178
    Abstract: An additive manufacturing system that includes a platen, a feed material delivery system configured to deliver feed material to a location on the platen specified by a computer aided design program and a heat source configured to raise a temperature of the feed material simultaneously across all of the layer or across a region that extends across a width of the platen and scans the region across a length of the platen. The heat source can be an array of heat lamps, or a plasma source.
    Type: Application
    Filed: October 9, 2017
    Publication date: March 8, 2018
    Inventors: Christopher A. Rowland, Anantha K. Subramani, Kasiraman Krishnan, Kartik Ramaswamy, Thomas B. Brezoczky, Swaminathan Srinivasan, Jennifer Y. Sun, Simon Yavelberg, Srinivas D. Nemani, Nag B. Patibandla, Hou T. Ng
  • Publication number: 20180029127
    Abstract: An additive manufacturing apparatus includes a platform, a dispenser to dispense layers of feed material on the platform, and a fusing system including an energy source to generate an energy beam having an adjustable intensity profile, an actuator to cause the energy beam to traverse across an outermost layer of feed material, and a controller coupled to the actuator and the energy source. The controller is configured to cause the energy source to adjust the intensity profile of the energy beam on the outermost layer of feed material based on a traversal velocity and/or a traversal direction of the light beam across the outermost layer of feed material.
    Type: Application
    Filed: July 20, 2017
    Publication date: February 1, 2018
    Inventors: Hou T. Ng, Ron Naftali, Christopher G. Talbot
  • Publication number: 20180029126
    Abstract: An additive manufacturing apparatus includes a platform, a dispenser to dispense layers of feed material on the platform, and a fusing system to direct an energy beam to fuse at least a portion of the outermost layer of feed material. The fusing system includes an energy source to emit the energy beam, a deformable mirror to receive the energy beam and reflect the energy beam, wherein a shape of the deformable mirror defines at least in part an intensity profile of the energy beam on the outermost layer of feed material, an actuator coupled to the deformable mirror, and a controller coupled to the actuator and configured to cause the actuator to deform the shape of the deformable mirror to adjust the intensity profile of the energy beam on the outermost layer of feed material in accordance to a desired profile.
    Type: Application
    Filed: July 20, 2017
    Publication date: February 1, 2018
    Inventors: Hou T. Ng, Ron Naftali, Christopher G. Talbot
  • Patent number: 9878920
    Abstract: A white pigment dispersion includes 10 to 60 wt % of low effective density TiO2, 1 to 40 wt % of a latex, and the balance a dispersing medium. Inks using the low effective density TiO2 and methods for preparing the low effective density TiO2 are also disclosed.
    Type: Grant
    Filed: September 27, 2013
    Date of Patent: January 30, 2018
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Yan Zhao, Howard S. Tom, Hou T. Ng
  • Publication number: 20180015663
    Abstract: In an example implementation, a method of three-dimensional (3D) printing includes applying a sinterable material, selectively applying a fusing agent on a portion of the sinterable material, applying a first amount of radiation energy to the portion of the sinterable material, and applying a second amount of radiation energy to the portion of the sinterable material different than the first amount of radiation energy.
    Type: Application
    Filed: April 30, 2015
    Publication date: January 18, 2018
    Applicant: Hewlett-Packard Development Company, L.P.
    Inventors: Lihua Zhao, Yan Zhao, Hou T. Ng
  • Publication number: 20180006083
    Abstract: An apparatus for positioning micro-devices on a substrate includes one or more supports to hold a donor substrate and a destination substrate, an adhesive dispenser to deliver adhesive on micro-devices on the donor substrate, a transfer device including a transfer surface to transfer the micro-devices from the donor substrate to the destination substrate, and a controller. The controller is configured to operate the adhesive dispenser to selectively dispense the adhesive onto selected micro-devices on the donor substrate based on a desired spacing of the selected micro-devices on the destination substrate. The controller is configured to operate the transfer device such that the transfer surface engages the adhesive on the donor substrate to cause the selected micro-devices to adhere to the transfer surface and the transfer surface then transfers the selected micro-devices from the donor substrate to the destination substrate.
    Type: Application
    Filed: September 20, 2016
    Publication date: January 4, 2018
    Applicant: Applied Materials, Inc.
    Inventors: Mingwei Zhu, Sivapackia Ganapathiappan, Boyi Fu, Hou T. Ng, Nag B. Patibandla
  • Publication number: 20180001550
    Abstract: In an example implementation, a method of printing a multi-structured three-dimensional (3D) object includes forming a layer of sinterable material. The method includes processing a first portion of the sinterable material using first set of processing parameters and processing a second portion of the sinterable material using a second set of processing parameters. The processed first and second portions form, respectively, parts of a first and second structure of a multi-structured 3D object.
    Type: Application
    Filed: April 30, 2015
    Publication date: January 4, 2018
    Inventors: Lihua Zhao, Yan Zhao, Hou T. Ng
  • Publication number: 20170361505
    Abstract: In one example, a lighting device for an additive manufacturing machine includes an array of light sources each to emit monochromatic light within a band of wavelengths that includes a peak light absorption of a liquid coalescing agent to be dispensed on to a build material.
    Type: Application
    Filed: September 26, 2014
    Publication date: December 21, 2017
    Inventors: James Elmer Abbott, JR., Alexander Govyadinov, Vladek Kasperchik, Krzysztof Nauka, Sivapackia Ganapathiappan, Lihua Zhao, Howard S. Tom, JR., Yan Zhao, Hou T. Ng
  • Patent number: 9823591
    Abstract: The present disclosure is drawn to apparatuses and methods that include a coated photoconductive substrate. The coated photoconductive substrate can include a photo-conductive substrate with a charge generation layer and a charge transport layer, and can also have a coating adhered to the photoconductive substrate. The coating can comprise a polymer and can be devoid of charge transport materials.
    Type: Grant
    Filed: July 31, 2013
    Date of Patent: November 21, 2017
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Sivapackia Ganapathiappan, Krzysztof Nauka, Hou T. Ng
  • Publication number: 20170326799
    Abstract: In one example, a non-transitory processor readable medium with instructions thereon that when executed cause an additive manufacturing machine to inhibit build material in an overlying layer of build material from fusing with a first slice formed in an underlying layer of build material.
    Type: Application
    Filed: January 14, 2015
    Publication date: November 16, 2017
    Inventors: Hou T. Ng, Alejandro Manuel De Pena
  • Publication number: 20170305066
    Abstract: In one example, a non-transitory processor readable medium having instructions thereon that when executed cause an additive manufacturing machine to expose build material to a light source emitting monochromatic light within a band of wavelengths that includes a peak light absorption of a liquid coalescing agent to be dispensed on to the build material.
    Type: Application
    Filed: September 26, 2014
    Publication date: October 26, 2017
    Inventors: Krzysztof Nauka, Sivapackia Ganapathiappan, Lihua Zhao, Howard S. Tom, Yan Zhao, Hou T. Ng, James Elmer Abbott, Jr., Alexander Govyadinov, Vladek Kasperchik