Patents by Inventor Chee Choi

Chee Choi 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: 20240282284
    Abstract: A sound wave delivery structure of the present invention comprises unit structure cells each formed to have a cubic shape and comprising a column portion formed on a region corresponding to sides, and a space portion formed in an internal region surrounded by the column portion. There are a plurality of unit structure cells which are successively arranged in a first direction, in which sound waves are delivered, and a second direction crossing the first direction.
    Type: Application
    Filed: November 1, 2022
    Publication date: August 22, 2024
    Applicant: CENTER FOR ADVANCED META-MATERIALS
    Inventors: Jae Hwa LEE, Tae In CHOI, Hak Joo LEE, Chee Young JOH
  • Patent number: 9107540
    Abstract: A handheld electric mixer has a rotational output spindle for holding mixer work pieces, first and second gears located on the rotational output spindle, and a motor. The first gear is rotationally coupled to the motor output shaft. The mixer includes a two-speed gear-box receiving torque from the motor, and transmitting the torque to the output spindle. The two-speed gear-box includes a rotational lay shaft axially parallel to the rotational output spindle, third and fourth gears located on the lay shaft, the third gear meshing with the first gear and the fourth gear meshing with the second gear. A selector mechanism selects between a first gear ratio and a second gear ratio and includes a clutch disk on the spindle, and moveable axially for alternatively engaging and rotatably locking the one of the third or fourth gears that is engaged with the clutch disk.
    Type: Grant
    Filed: April 23, 2012
    Date of Patent: August 18, 2015
    Assignee: Main Power Electrical Factory Ltd.
    Inventors: Bo Gao, Mei Chee Choi
  • Publication number: 20120228968
    Abstract: A handheld electric mixer has a rotational output spindle for holding mixer work pieces, first and second gears located on the rotational output spindle, and a motor. The first gear is rotationally coupled to the motor output shaft. The mixer includes a two-speed gear-box receiving torque from the motor, and transmitting the torque to the output spindle. The two-speed gear-box includes a rotational lay shaft axially parallel to the rotational output spindle, third and fourth gears located on the lay shaft, the third gear meshing with the first gear and the fourth gear meshing with the second gear. A selector mechanism selects between a first gear ratio and a second gear ratio and includes a clutch disk on the spindle, and moveable axially for alternatively engaging and rotatably locking the one of the third or fourth gears that is engaged with the clutch disk.
    Type: Application
    Filed: April 23, 2012
    Publication date: September 13, 2012
    Applicant: MAIN POWER ELECTRICAL FACTORY LTD.
    Inventors: William Kwok Kay LEE, Mei Chee Choi, Bo GAO
  • Publication number: 20080055817
    Abstract: A capacitor structure and a method of fabricating the capacitor structure wherein. The lower electrode and the upper electrode are constructed to be separated from each other by a predetermined interval and to be engaged with each other using a series of alternating ridges so that an effective surface area can increase within a limited area.
    Type: Application
    Filed: October 24, 2007
    Publication date: March 6, 2008
    Inventors: Chee Choi, Dong Keum
  • Publication number: 20070241381
    Abstract: Semiconductor devices and methods for fabricating a semiconductor devices are disclosed. A disclosed method comprises: forming a first gate electrode functioning as a flash memory; forming first spacers on sidewalls of the first gate electrode; forming a second gate electrode functioning as a normal gate electrode; forming a source/drain region with a shallow junction by performing a first ion implantation process using at least one of the first spacers as a mask; forming second spacers on a sidewall of the first spacer and on sidewalls of the second gate electrode; forming a source/drain region with a deep junction by performing a second ion implantation process using the second spacers as a mask.
    Type: Application
    Filed: June 18, 2007
    Publication date: October 18, 2007
    Inventors: Seok Kim, Chee Choi
  • Publication number: 20060154437
    Abstract: A capacitor for a semiconductor device includes a first inter metal dielectric layer is disposed on a substrate. A first electrode is disposed on the first inter metal dielectric layer. A second electrode partially overlaps the first electrode. A first dielectric layer is disposed between the first and second electrodes. A third electrode partially overlaps the second electrode. A second dielectric layer is disposed between the second and third electrodes. An etch stop layer is disposed on the first, second, and third electrodes. A second inter metal dielectric layer is formed on the etch stop layer and includes first, second, and third via holes exposing the first and third electrodes and the etch stop layer. First, second, and third plugs are disposed in the first, second, and third via holes.
    Type: Application
    Filed: March 6, 2006
    Publication date: July 13, 2006
    Applicant: DongbuAnam Semiconductor, Inc.
    Inventor: Chee Choi
  • Publication number: 20060145270
    Abstract: A semiconductor device having a silicide-blocking layer is provided. The device includes a field oxide layer defining an active region, source/drain regions in the active region of a substrate, a gate oxide layer and a gate electrode on the substrate between the source/drain regions, dielectric spacers on sidewalls of the gate electrode, and a silicide layer on both the gate electrode and the source/drain regions. The device also includes the silicide-blocking layer formed over the border between the field oxide layer and the source/drain regions. The silicide-blocking layer covers edges of the source/drain regions, obstructing the extension of the silicide layer.
    Type: Application
    Filed: December 29, 2005
    Publication date: July 6, 2006
    Inventor: Chee Choi
  • Publication number: 20060148159
    Abstract: A CMOS image sensor and fabricating method thereof are disclosed, by which a light condensing effect is enhanced by providing an inner microlens to a semiconductor substrate. The present invention includes a plurality of photodiodes on a semiconductor substrate, a plurality of inner microlenses on a plurality of the photodiodes, an insulating interlayer on a plurality of the inner microlenses, a plurality of metal lines within the insulating interlayer, a device protecting layer on the insulating interlayer, and a plurality of microlenses on the device protecting layer.
    Type: Application
    Filed: December 29, 2005
    Publication date: July 6, 2006
    Applicant: DongbuAnam Semiconductor Inc.
    Inventors: Dong Seo, Chee Choi
  • Publication number: 20060145234
    Abstract: A capacitor structure and a method of fabricating the capacitor structure wherein. The lower electrode and the upper electrode are constructed to be separated from each other by a predetermined interval and to be engaged with each other using a series of alternating ridges so that an effective surface area can increase within a limited area.
    Type: Application
    Filed: December 29, 2005
    Publication date: July 6, 2006
    Inventors: Chee Choi, Dong Keum
  • Publication number: 20060138517
    Abstract: Disclosed are a vertical-type capacitor and a formation method thereof. The capacitor includes a first electrode wall and a second electrode wall perpendicular to a semiconductor substrate, and at least one dielectric layer on the substrate to insulate the first electrode wall from the second electrode wall. The first electrode wall includes a plurality of first conductive layers and a plurality of first contacts, the plurality of first conductive layers being interconnected with each other by each of the plurality of first contacts. The second electrode wall includes a plurality of second conductive layers and a plurality of second contacts, the plurality of second conductive layers being interconnected with each other by each of the plurality of second contacts.
    Type: Application
    Filed: December 28, 2005
    Publication date: June 29, 2006
    Inventor: Chee Choi
  • Publication number: 20060035461
    Abstract: A copper line on a semiconductor device and a method for forming the same is disclosed, wherein an insulating layer is deposited so as to minimize the dishing of IMD without using a dummy area when performing the planarization process. The method of forming the copper line on the semiconductor device includes the steps of forming an IMD on a semiconductor substrate including a lower metal layer, forming an isolation layer on the IMD, exposing the lower metal layer by patterning the IMD and the isolation layer, forming a copper layer on the exposed lower metal layer and the isolation layer, and planarizing the copper layer.
    Type: Application
    Filed: August 11, 2005
    Publication date: February 16, 2006
    Inventor: Chee Choi
  • Publication number: 20050142800
    Abstract: An isolation method in a semiconductor device is disclosed. The example method sequentially forms a pad oxide layer and a pad nitride layer on a semiconductor substrate, patterns the pad nitride and oxide layers to form an opening exposing a portion of the substrate, and forms a trench in exposed portion of the substrate. The example method also etches the patterned pad nitride layer to extend the opening, carries out SAC oxidation on the extended opening and the trench to provide a rounded corner to an upper corner of the substrate in the vicinity of the trench, and fills the trench with an insulating layer.
    Type: Application
    Filed: December 28, 2004
    Publication date: June 30, 2005
    Inventor: Chee Choi
  • Publication number: 20050139886
    Abstract: A capacitor for a semiconductor device includes a first inter metal dielectric layer is disposed on a substrate. A first electrode is disposed on the first inter metal dielectric layer. A second electrode partially overlaps the first electrode. A first dielectric layer is disposed between the first and second electrodes. A third electrode partially overlaps the second electrode. A second dielectric layer is disposed between the second and third electrodes. An etch stop layer is disposed on the first, second, and third electrodes. A second inter metal dielectric layer is formed on the etch stop layer and includes first, second, and third via holes exposing the first and third electrodes and the etch stop layer. First, second, and third plugs are disposed in the first, second, and third via holes.
    Type: Application
    Filed: December 30, 2004
    Publication date: June 30, 2005
    Applicant: DongbuAnam Semiconductor, Inc.
    Inventor: Chee Choi
  • Publication number: 20050042820
    Abstract: A method of fabricating a metal-insulator-metal capacitor in a semiconductor device is disclosed. An example method for fabricating an MIM capacitor of a semiconductor device deposits a metal layer to be used as a lower electrode of an MIM capacitor, deposits a sacrificial layer on the metal layer, and removes some part of the sacrificial layer to form the MIM capacitor thereon. In addition, the example method deposits a dielectric layer and an upper metal layer and forms the MIM capacitor by patterning the dielectric layer and the upper metal layer.
    Type: Application
    Filed: January 15, 2004
    Publication date: February 24, 2005
    Inventor: Chee Choi
  • Patent number: D677520
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: March 12, 2013
    Assignee: Zwilling J. A. Henckets AG
    Inventors: June Mei Chee Choi, Jun Wang