Patents by Inventor Chi Hwan Choi

Chi Hwan 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: 20240347906
    Abstract: The present invention relates to a full analog phase shifter and an antenna apparatus including same, and more particularly, comprises: a variable switch panel including a first conductive pattern terminal and a second conductive pattern terminal; and an antenna element substrate on which a plurality of array antenna elements are arranged and a transmission line being in contact with the first conductive pattern terminal and the second conductive pattern terminal is pattern-printed, wherein, due to a phase shift caused by contact points of the transmission line with respect to the first conductive pattern terminal and the second conductive pattern terminal, phases of the plurality of antenna elements are linearly array distributed on a same reference phase plane, thereby providing an advantage of easily implementing a mirror symmetry structure having a linear phase distribution only by a phase shift in an RF stage without phase conversion in a digital stage.
    Type: Application
    Filed: June 28, 2024
    Publication date: October 17, 2024
    Applicant: KMW INC.
    Inventors: Duk Yong KIM, Young Chan MOON, Seong Man KANG, Sung Hwan SO, Chi Back RYU, Kyo Sung JI, Oh Seog CHOI, Dong Hee SHIN, Won Jun PARK, Yong Won SEO
  • Patent number: 10728431
    Abstract: A fish eye camera is provided. A main circuit board is fixed to an inside of a base housing. A middle housing is formed to cover both of the main circuit board and a camera module and fixed to the base housing in a state in which a fish eye lens of the camera module is drawn from the middle housing. A bracket includes a bracket body, which is insertion-coupled to a plurality of light emitting diode (LED) substrates and elastically supports the plurality of LED substrates in a state in which the plurality of LED substrates are arranged around an outer side of the middle housing, and metal bodies which are inserted into the bracket body to be in contact with the LED substrates. A cover housing is formed to cover both of the bracket and the middle housing and fixed to the base housing.
    Type: Grant
    Filed: April 3, 2019
    Date of Patent: July 28, 2020
    Assignee: IDIS CO., LTD.
    Inventors: Jin Kyu Song, Chi Hwan Choi, Hyun Geun Ahn
  • Publication number: 20200236252
    Abstract: A fish eye camera is provided. A main circuit board is fixed to an inside of a base housing. A middle housing is formed to cover both of the main circuit board and a camera module and fixed to the base housing in a state in which a fish eye lens of the camera module is drawn from the middle housing. A bracket includes a bracket body, which is insertion-coupled to a plurality of light emitting diode (LED) substrates and elastically supports the plurality of LED substrates in a state in which the plurality of LED substrates are arranged around an outer side of the middle housing, and metal bodies which are inserted into the bracket body to be in contact with the LED substrates. A cover housing is formed to cover both of the bracket and the middle housing and fixed to the base housing.
    Type: Application
    Filed: April 3, 2019
    Publication date: July 23, 2020
    Applicant: IDIS CO., LTD.
    Inventors: Jin Kyu SONG, Chi Hwan CHOI, Hyun Geun AHN
  • Patent number: 7611003
    Abstract: An apparatus for braking a counter shaft of a transmission, where the apparatus can cut off power delivery to the transmission and simultaneously reduce a rotation speed of the counter shaft for an easier gear shift. The apparatus includes: a transmission case; a counter shaft in the transmission case; a counter shaft brake that is engaged with the counter shaft and variably stops the counter shaft; and a counter shaft brake operating fork for operating the counter shaft brake.
    Type: Grant
    Filed: November 22, 2006
    Date of Patent: November 3, 2009
    Assignee: Hyundai Motor Company
    Inventor: Chi Hwan Choi
  • Publication number: 20080073173
    Abstract: An apparatus for braking a counter shaft of a transmission, where the apparatus can cut off power delivery to the transmission and simultaneously reduce a rotation speed of the counter shaft for an easier gear shift. The apparatus includes: a transmission case; a counter shaft in the transmission case; a counter shaft brake that is engaged with the counter shaft and variably stops the counter shaft; and a counter shaft brake operating fork for operating the counter shaft brake.
    Type: Application
    Filed: November 22, 2006
    Publication date: March 27, 2008
    Inventor: Chi Hwan Choi