Patents by Inventor Yoon Hwan Choi

Yoon 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).

  • Centrifuge having water discharge structure and purifier system using the same
    Patent number: 9919321
    Abstract: A centrifuge able to discharge moisture through a separate moisture outlet by separating moisture from oil when spraying oil through a nozzle of a rotor, thereby removing moisture from oil without using a separate skimmer, and a purifier system including the same. The centrifuge includes a casing, a shat, a stand tube and a rotor. The casing has an oil inlet, an oil outlet, a moisture outlet and an air inlet. Moisture separated from oil sprayed through a nozzle of the rotor is discharged along with air out of the casing through the moisture outlet. An amount of air identical to the amount of the air discharged through the moisture outlet is introduced into the casing through the air inlet.
    Type: Grant
    Filed: May 9, 2014
    Date of Patent: March 20, 2018
    Assignee: SHIN HEUNG PRECISION CO., LTD.
    Inventors: Yong-Keun Kim, Ho-Jin Eum, In-Soo Kim, Kyo-Hye Ye, Yeon-Won Lee, Yoon-Hwan Choi
  • CENTRIFUGE HAVING WATER DISCHARGE STRUCTURE AND PURIFIER SYSTEM USING THE SAME
    Publication number: 20150283560
    Abstract: A centrifuge able to discharge moisture through a separate moisture outlet by separating moisture from oil when spraying oil through a nozzle of a rotor, thereby removing moisture from oil without using a separate skimmer, and a purifier system including the same. The centrifuge includes a casing, a shat, a stand tube and a rotor. The casing has an oil inlet, an oil outlet, a moisture outlet and an air inlet. Moisture separated from oil sprayed through a nozzle of the rotor is discharged along with air out of the casing through the moisture outlet. An amount of air identical to the amount of the air discharged through the moisture outlet is introduced into the casing through the air inlet.
    Type: Application
    Filed: May 9, 2014
    Publication date: October 8, 2015
    Applicant: Shin Heung Precision Co., Ltd.
    Inventors: Yong-Keun Kim, Ho-Jin Eum, In-Soo Kim, Kyo-Hye Ye, Yeon-Won Lee, Yoon-Hwan Choi
  • Process of preparing an alkylamine derivative
    Patent number: 8779192
    Abstract: The present invention provides a method of preparing an alkylamine derivates which hardly generates impurities and enables mass production with high purity.
    Type: Grant
    Filed: May 14, 2010
    Date of Patent: July 15, 2014
    Assignee: Kolon Life Science, Inc.
    Inventors: Yoon-Hwan Choi, Won-Tae Chang
  • METHOD OF PREPARING AN ALKYLAMINE DERIVATIVE
    Publication number: 20120046494
    Abstract: The present invention provides a method of preparing an alkylamine derivates which hardly generates impurities and enables mass production with high purity.
    Type: Application
    Filed: May 14, 2010
    Publication date: February 23, 2012
    Applicant: KOLON LIFE SCIENCE, INC.
    Inventors: Yoon-Hwan Choi, Won-Tae Chang
  • Process for the preparation of chiral 3,4-epoxybutyric acid and the salt thereof
    Patent number: 6232478
    Abstract: The present invention relates to a process for the preparation of chiral 3,4-epoxybutyric acid expressed by formula (1) and the salt thereof, wherein (S)-3-activated-hydroxybutyrolactone expressed by formula (2) is subjected to a ring-opening reaction to obtain 4-hydroxy-3-activated hydroxybutyric acid expressed by formula (3), which is subjected to an epoxydation with an inversion of the chiral center.
    Type: Grant
    Filed: January 14, 2000
    Date of Patent: May 15, 2001
    Inventors: Il Suk Byun, Kyung Il Kim, Yoon Hwan Choi