Patents by Inventor Seong-Ho Ryu

Seong-Ho Ryu 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: 11028046
    Abstract: The present invention relates to a toluene diisocyanate purification method enabling acquisition of a product having a small amount of dimers in a final product by means of using a reactive dividing wall column during toluene diisocyanate preparation. More particularly, according to the present invention, in order to obtain a product having a small amount of dimers in accordance with a reversible reaction of a monomer and a dimer, a purification procedure is designed by means of applying the temperature, pressure, time of stay and the like of a reactive dividing wall column as appropriate particular conditions, a reboiler having short time of stay and high heat transfer rate is used, and thus a dimerization reaction is inhibited and the purity and yield of the product are enhanced. Therefore, high-purity toluene diisocyanate can be purified and obtained.
    Type: Grant
    Filed: December 12, 2017
    Date of Patent: June 8, 2021
    Assignee: HANWHA CHEMICAL CORPORATION
    Inventors: Hyun Cheol Ryu, Kee Do Han, Seong Ho Park, Chang Mo Chung
  • Patent number: 11025171
    Abstract: A power converter having a Scott-T transformer includes a direct current to alternating current converter configured to have at least two multilevel converters converting input direct current power to alternating current power, a Scott-T transformer configured to operate in medium frequency of several hundreds of Hz to several tens of kHz, to transform a voltage level of the alternating current power from each of the at least two multilevel converters of the direct current to alternating current converter into three-phase alternating current power, and to output the three-phase alternating current power, and an alternating current to direct current converter configured to convert the three-phase alternating current power from the Scott-T transformer to direct current power.
    Type: Grant
    Filed: May 2, 2019
    Date of Patent: June 1, 2021
    Assignee: Hyundai Electric & Energy Systems Co., Ltd.
    Inventors: Young-Ho Park, Seung-Pyo Ryu, Soo-Nam Kim, Seong-Il Kim, Milovanovic Stefan, Dujic Drazen
  • Patent number: 6256481
    Abstract: A device for electrically connecting a microphone mounted on a flip cover to an audio circuit of a telephone body. The flip cover is detachable from the telephone body when an excessive force is applied thereto. A hinge apparatus includes two hinge modules each including a hinge housing, a hinge shaft having a protrusion at an end and a shaft at another end, being assembled into the hinge housing; conductive means fixedly pressed into a through hole formed along an axis of the hinge shaft; a cam hinge having opposing protrusions and opposing indents formed alternately at one side, engaging with the hinge shaft, and a through hole formed along the axis of the hinge shaft; a hinge cover mounted so as to cover an end of the hinge housing, the hinge cover having a through hole formed along the axis of the hinge shaft, through which an electric wire passes; and a coil spring intervening between the cam hinge and the hinge cover to provide an elastic force.
    Type: Grant
    Filed: April 27, 1998
    Date of Patent: July 3, 2001
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Byeong-Ro Jeong, Young-Jin Yi, Sung-Soo Go, Seong-Ho Ryu