Patents by Inventor Ka Fai Lee

Ka Fai Lee 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: 11557662
    Abstract: A semiconductor device includes a junction field effect transistor (JFET) on a silicon-on-insulator (SOI) substrate. The JFET includes a gate with a first gate segment contacting the channel on a first lateral side of the channel, and a second gate segment contacting the channel on a second, opposite, lateral side of the channel. The first gate segment and the second gate segment extend deeper in the semiconductor layer than the channel. The JFET further includes a drift region contacting the channel, and may include a buried layer having the same conductivity type as the channel, extending at least partway under the drift region.
    Type: Grant
    Filed: November 2, 2020
    Date of Patent: January 17, 2023
    Assignee: Texas Instruments Incorporated
    Inventor: Zachary Ka Fai Lee
  • Patent number: 11404556
    Abstract: A semiconductor device includes a Silicon-on-Insulator (SOI) substrate including a top device layer, a buried oxide (BOX) layer, and a bottom handle portion. A filled trench is lined with a trench dielectric layer that extends to at least the BOX layer, defining an inner and an outer portion of the device layer. A field effect transistor (FET) includes an inner portion, a source region having a source contact thereto and a drain region having a drain contact thereto, each doped a first doping type. A gate region has a gate contact that is separated from the inner portion by the trench dielectric. The source and drain region are separated by a body region doped a second doping type having a body contact.
    Type: Grant
    Filed: November 2, 2020
    Date of Patent: August 2, 2022
    Assignee: Texas Instruments Incorporated
    Inventors: Zachary Ka Fai Lee, YuGuo Wang
  • Publication number: 20220140116
    Abstract: A semiconductor device includes a junction field effect transistor (JFET) on a silicon-on-insulator (SOI) substrate. The JFET includes a gate with a first gate segment contacting the channel on a first lateral side of the channel, and a second gate segment contacting the channel on a second, opposite, lateral side of the channel. The first gate segment and the second gate segment extend deeper in the semiconductor layer than the channel. The JFET further includes a drift region contacting the channel, and may include a buried layer having the same conductivity type as the channel, extending at least partway under the drift region.
    Type: Application
    Filed: November 2, 2020
    Publication date: May 5, 2022
    Applicant: Texas Instruments Incorporated
    Inventor: Zachary Ka Fai Lee
  • Publication number: 20220140105
    Abstract: A semiconductor device includes a Silicon-on-Insulator (SOI) substrate including a top device layer, a buried oxide (BOX) layer, and a bottom handle portion. A filled trench is lined with a trench dielectric layer that extends to at least the BOX layer, defining an inner and an outer portion of the device layer. A field effect transistor (FET) includes an inner portion, a source region having a source contact thereto and a drain region having a drain contact thereto, each doped a first doping type. A gate region has a gate contact that is separated from the inner portion by the trench dielectric. The source and drain region are separated by a body region doped a second doping type having a body contact.
    Type: Application
    Filed: November 2, 2020
    Publication date: May 5, 2022
    Inventors: Zachary Ka Fai Lee, YuGuo Wang
  • Publication number: 20040016068
    Abstract: An electric toothbrush (10, 100) is disclosed as including an electric motor (22, 122), a shaft (56, 156) engaged with a brush head (18), and a coupling mechanism operatively associated with the motor (22, 122) and the shaft (56, 156) for coupling with the motor (22, 122) to drive the shaft (56, 156) to swivel about a longitudinal axis of the shaft (56, 156), the coupling mechanism including a reciprocating block (34, 134) reciprocable along a straight line perpendicular to the longitudinal axis of the shaft (56, 156).
    Type: Application
    Filed: March 19, 2003
    Publication date: January 29, 2004
    Applicant: SUN LUEN ELECTRICAL MFG. CO. LTD.
    Inventor: Ka Fai Lee
  • Publication number: 20040016069
    Abstract: An electric toothbrush (10) is disclosed as including an electric motor (22), a shaft (56) engaged with a brush head (18), and a coupling mechanism operatively associated with the motor (22) and the shaft (56) for transmitting the motional output of the motor (22) to drive the shaft (56) to swivel about its longitudinal axis, the coupling mechanism including a reciprocating block (34) reciprocable along a straight line perpendicular to the longitudinal axis of the shaft (56).
    Type: Application
    Filed: July 25, 2002
    Publication date: January 29, 2004
    Applicant: SUN LUEN ELECTRICAL MFG. CO. LTD.
    Inventor: Ka Fai Lee
  • Patent number: 5640021
    Abstract: Novel optical modulators and other high performance Faraday-Stark magneto-optoelectronic devices (MOE's) are disclosed that allow electrical adjusting of the polarization (or other optical properties) of an excitation light at high modulation bandwidth and deep modulation depths through the Faraday-Stark effect. The high performance Faraday-Stark magneto-optoelectronic devices of the present invention include a Faraday-Stark cell having at least one quantum well formed in a semiconductor or other material defining transition energies and wavefunction overlaps that correspond to the presence and/or magnitude of magnetic and electric fields that may be present to the quantum wells of the cell.
    Type: Grant
    Filed: August 25, 1995
    Date of Patent: June 17, 1997
    Assignee: Massachusetts Institute of Technology
    Inventors: Zachary Ka Fai Lee, Donald Eugene Heiman