Patents by Inventor Yong Shik Chu

Yong Shik Chu 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).

  • Method for extracting minerals with high purity from deep ocean water
    Publication number: 20080025908
    Abstract: A method for efficiently extracting minerals of high purity from deep ocean water by using low temperature vacuum crystal is disclosed.
    Type: Application
    Filed: July 24, 2007
    Publication date: January 31, 2008
    Inventors: Yong-Shik Chu, Tae-Myun Son
  • Pressure-balanced underwater acoustic transducer
    Patent number: 6555947
    Abstract: Provided is a pressure-balanced underwater acoustic transducer. The transducer includes an oscillator unit having an oscillator oscillating by an electrical signal supplied to electrodes, provided on its surface, a sound transmission material for transmitting sound from the oscillator, provided at its periphery, and a transducer housing provided at the exterior of the sound transmission material, a sound reflector positioned over the oscillator unit, for reflecting sound propagated from the oscillator, a water entry layer formed at a space between the oscillator unit and the sound reflector to allow water to enter and exit to the rear window of the oscillator, thereby leading to a balanced state of pressures applied to the front and rear windows of the oscillator, and a phase combiner for combining sound reflected from the sound reflector and straight traveling sound generated from the front window of the oscillator into one single phase.
    Type: Grant
    Filed: February 22, 2002
    Date of Patent: April 29, 2003
    Assignee: Korea Ocean Research and Development Institute
    Inventors: Kyung Soo Bahk, Yong Shik Chu, Hee Jun Lee
  • Pressure-balanced underwater acoustic transducer
    Publication number: 20020175600
    Abstract: Provided is a pressure-balanced underwater acoustic transducer. The transducer includes an oscillator unit having an oscillator oscillating by an electrical signal supplied to electrodes, provided on its surface, a sound transmission material for transmitting sound from the oscillator, provided at its periphery, and a transducer housing provided at the exterior of the sound transmission material, a sound reflector positioned over the oscillator unit, for reflecting sound propagated from the oscillator, a water entry layer formed at a space between the oscillator unit and the sound reflector to allow water to enter and exit to the rear window of the oscillator, thereby leading to a balanced state of pressures applied to the front and rear windows of the oscillator, and a phase combiner for combining sound reflected from the sound reflector and straight traveling sound generated from the front window of the oscillator into one single phase.
    Type: Application
    Filed: February 22, 2002
    Publication date: November 28, 2002
    Inventors: Kyung Soo Bahk, Yong Shik Chu, Hee Jun Lee