Patents by Inventor Dennis K. Lieu

Dennis K. Lieu 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: 10112491
    Abstract: A hybrid/electric vehicle power management system in which an Inertial Storage and Recovery System (INSTAR) utilizes an enhanced Flywheel Energy Storage (FES) system to reach higher vehicle efficiencies. INSTAR allows regenerative braking energy surges to be readily stored at high efficiency on the flywheel, whose energy is then converted to power for driving the motors, or charging the batteries at an efficient charging rate.
    Type: Grant
    Filed: April 21, 2016
    Date of Patent: October 30, 2018
    Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Dennis K. Lieu, Daniel R. Talancon
  • Publication number: 20160311325
    Abstract: A hybrid/electric vehicle power management system in which an Inertial Storage and Recovery System (INSTAR) utilizes an enhanced Flywheel Energy Storage (FES) system to reach higher vehicle efficiencies. INSTAR allows regenerative braking energy surges to be readily stored at high efficiency on the flywheel, whose energy is then converted to power for driving the motors, or charging the batteries at an efficient charging rate.
    Type: Application
    Filed: April 21, 2016
    Publication date: October 27, 2016
    Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Dennis K. Lieu, Daniel R. Talancon
  • Patent number: 7190548
    Abstract: The present invention is directed to a miniature hard disc drive having a metal base plate, an actuator assembly wherein the actuator assembly comprises a plurality of bearings, a shaft, and a housing; a spindle motor assembly comprising a stator with conductors, a shaft, a plurality of bearings, and a rotor; and a monolithic body of phase change material unitizing said actuator assembly housing and stator to the base plate. Methods of developing and constructing the hard disc drive are also disclosed.
    Type: Grant
    Filed: September 12, 2005
    Date of Patent: March 13, 2007
    Assignee: Encap Technologies Inc.
    Inventors: Griffith D. Neal, Dennis K. Lieu
  • Patent number: 7067944
    Abstract: A motor comprises a baseplate, a shaft supported by said baseplate, a stator assembly having windings, the stator being rigidly attached to said baseplate, and injection molded thermoplastic material encapsulating said windings. In one embodiment, the stator is coreless. In other embodiments, the stator has a core and the core is substantially encapsulated by the thermoplastic material. In preferred embodiments, the thermoplastic material secures the stator to the baseplate or forms the baseplate.
    Type: Grant
    Filed: January 14, 2005
    Date of Patent: June 27, 2006
    Assignee: Encap Motor Corporation
    Inventors: Dennis K. Lieu, Griffith D. Neal
  • Patent number: 6941640
    Abstract: The present invention is directed to a miniature hard disc drive having a metal base plate, an actuator assembly wherein the actuator assembly comprises a plurality of bearings, a shaft, and a housing; a spindle motor assembly comprising a stator with conductors, a shaft, a plurality of bearings, and a rotor; and a monolithic body of phase change material unitizing said actuator assembly housing and stator to the base plate. Methods of developing and constructing the hard disc drive are also disclosed.
    Type: Grant
    Filed: October 25, 2001
    Date of Patent: September 13, 2005
    Assignee: Encap Motor Corporation
    Inventors: Griffith D. Neal, Dennis K. Lieu
  • Patent number: 6844636
    Abstract: A spindle motor comprises a baseplate, a shaft supported by said baseplate, a stator assembly having windings, the stator being rigidly attached to said baseplate, injection molded thermoplastic material encapsulating said windings, and a hub supported on said shaft, said hub having a magnet connected thereto in operable proximity to the stator assembly. In one embodiment, the stator is coreless. In other embodiments, the stator has a core and the core is substantially encapsulated by the thermoplastic material. In preferred embodiments, the thermoplastic material secures the stator to the baseplate or forms the baseplate.
    Type: Grant
    Filed: December 15, 2000
    Date of Patent: January 18, 2005
    Assignee: Encap Motor Corporation
    Inventors: Dennis K. Lieu, Griffith D. Neal
  • Publication number: 20030081347
    Abstract: The present invention is directed to a miniature hard disc drive having a metal base plate, an actuator assembly wherein the actuator assembly comprises a plurality of bearings, a shaft, and a housing; a spindle motor assembly comprising a stator with conductors, a shaft, a plurality of bearings, and a rotor; and a monolithic body of phase change material unitizing said actuator assembly housing and stator to the base plate. Methods of developing and constructing the hard disc drive are also disclosed.
    Type: Application
    Filed: October 25, 2001
    Publication date: May 1, 2003
    Applicant: ENCAP MOTOR CORPORATION.
    Inventors: Griffith D. Neal, Dennis K. Lieu
  • Publication number: 20010045782
    Abstract: A spindle motor comprises a baseplate. a shaft supported by said baseplate, a stator assembly having windings, the stator being rigidly attached to said baseplate, injection molded thermoplastic material encapsulating said windings, and a hub supported on said shaft, said hub having a magnet connected thereto in operable proximity to the stator assembly. In one embodiment, the stator is cordless. In other embodiments, the stator has a core and the core is substantially encapsulated by the thermoplastic material. In preferred embodiments, the thermoplastic material secures the stator to the baseplate or forms the baseplate.
    Type: Application
    Filed: December 15, 2000
    Publication date: November 29, 2001
    Inventors: Dennis K. Lieu, Griffith D. Neal
  • Patent number: 4777549
    Abstract: A filtering means is provided in a data recording disk file for filtering air flowing from the region of the spindle bearings into the head/disk area of the disk file. The filtering means is mounted to the disk file frame adjacent the rotary shaft of the spindle and together with the shaft defines a narrow annular gap for the flow of a very small portion of the total air flow from the region surrounding the spindle bearings. The filtering means includes first and second ring members which have axially-directed openings and which together support filter material located between the ring members. The primary portion of the air flow from the spindle bearings passes through the axially-directed openings of the ring members and the filter material and is thus filtered before entering the head/disk area.
    Type: Grant
    Filed: October 14, 1986
    Date of Patent: October 11, 1988
    Assignee: International Business Machines Corporation
    Inventors: Sherman Z. Dushkes, Dennis K. Lieu
  • Patent number: 4499736
    Abstract: A dehumidifier for a head-disk assembly in a disk drive unit. The dehumidifier includes a housing which is ported to define an air passage therethrough. Within the passage is a Peltier effect device that has a cold surface exposed to air flowing within the passage and a hot surface connected to a heat radiator. Water vapor carried in air that contacts the cold surface condenses; there is sump below the cold surface to contain water that condenses. The housing is installed so that air flow through the passage is induced by convection.
    Type: Grant
    Filed: December 8, 1983
    Date of Patent: February 19, 1985
    Assignee: Sperry Corporation
    Inventors: Dennis K. Lieu, Larry Cooper