Patents by Inventor Dae-Woo Lee

Dae-Woo 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).

  • Styrene-acrylonitrile resin with high thermal resistance and method for producing the same
    Patent number: 10696766
    Abstract: The present invention provides a styrene-acrylonitrile (SAN) resin that exhibits significantly improved thermal resistance and, at the same time, can be produced at high productivity and is highly processable and highly moldable; and a method of producing the same by preparing and storing the solution containing a mixture of an N-substituted maleimide monomer and an unsaturated nitrile monomer at a particular temperature, introducing the solution and a styrene polymer into the polymerization reactor separately, and maintaining the first polymerization reactor and the second polymerization reactor at particular respective temperatures, thereby significantly reducing the amounts of oligomers contained in the SAN resin.
    Type: Grant
    Filed: September 6, 2017
    Date of Patent: June 30, 2020
    Assignee: LG CHEM, LTD.
    Inventors: Jae Bum Seo, Dae Woo Lee, Jung Tae Park, Gyu Sun Kim, Chang Hun Han
  • METHOD FOR PREPARING GRAFT COPOLYMER AND GRAFT COPOLYMER PREPARED THEREBY
    Publication number: 20200199280
    Abstract: Provided are a method for preparing a graft copolymer and a graft copolymer prepared thereby, the method comprising: preparing a reaction solution comprising a copolymer comprising a unit derived from a diene-based monomer and a unit derived from an alkene-based monomer, an aromatic vinyl-based monomer, a vinyl cyan-based monomer, and a reaction solvent; and adding the reaction solution to perform primary bulk polymerization at 100 to 110° C., wherein the copolymer comprises the unit derived from a diene-based monomer in an amount of 5 to 10 wt %, and the graft copolymer has an average rubber particle size of 2 to 5?m.
    Type: Application
    Filed: October 26, 2018
    Publication date: June 25, 2020
    Inventors: Jae Bum SEO, Dae Woo LEE, Jung Tae PARK, Gyu Sun KIM, Ji Uk JANG
  • APPARATUS INCORPORATING NON-ISOLATED CHARGER AND DC CONVERTER
    Publication number: 20200195035
    Abstract: An apparatus of incorporating a non-isolated charger and a DC converter, may include a non-isolated charger including a non-isolated converter converting a level of input voltage and outputting converted voltage to a battery; and a DC converter including a first switch selectively making an electrical connection to a connection node of the non-isolated converter and the battery and a primary side circuit including at least some of switching elements included in the non-isolated converter and converting a level of voltage of the battery transmitted by the primary side circuit and outputting converted voltage.
    Type: Application
    Filed: August 2, 2019
    Publication date: June 18, 2020
    Applicants: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Dea Ki Cheong, Dae Woo Lee
  • PLANAR TRANSFORMER
    Publication number: 20200194162
    Abstract: A planar transformer is disclosed. The planar transformer includes a first core, a second core, a third core, and a fourth core, which are sequentially disposed; a primary coil unit having multiple primary substrates through which the first to fourth cores penetrate and on which primary coil patterns are formed such that magnetic flux is generated in a first direction in the first and fourth cores and in a second direction in the second and third cores; and a secondary coil unit having multiple secondary substrates through which the first to fourth cores penetrate and on which secondary coil patterns are formed, the secondary coil patterns formed on a periphery of the first to fourth cores such that current induced by the magnetic flux flowing in the first to fourth cores flows therein, wherein the multiple primary and secondary substrates form a multi-layer structure.
    Type: Application
    Filed: July 12, 2019
    Publication date: June 18, 2020
    Applicants: HYUNDAI MOTOR COMPANY, KIA MOTORS CORPORATION
    Inventors: In Yong YEO, Tae Jong HA, Dae Woo LEE, Youn Sik LEE
  • ETCHING COMPOSITION FOR THIN FILM CONTAINING SILVER, METHOD FOR FORMING PATTERN AND METHOD FOR MANUFACTURING A DISPLAY DEVICE USING THE SAME
    Publication number: 20200148950
    Abstract: An etching composition for a silver-containing thin film includes an inorganic acid compound, a carboxylic acid compound, a sulfonic acid compound, a glycol compound, a nitrogen-containing dicarbonyl compound, a metal-based oxidizer, and water.
    Type: Application
    Filed: September 19, 2019
    Publication date: May 14, 2020
    Inventors: Jonghee PARK, Kitae KIM, Jinseock KIM, Gyu-Po KIM, Hyun-Cheol SHIN, Dae-Woo LEE, Sang-Hyuk LEE
  • ETCHING COMPOSITION, METHOD FOR FORMING PATTERN AND METHOD FOR MANUFACTURING A DISPLAY DEVICE USING THE SAME
    Publication number: 20200148951
    Abstract: An etching composition includes an inorganic acid compound, a carboxylic acid compound, a sulfonic acid compound, a glycol compound, a nitrogen-containing dicarbonyl compound, a sulfate compound and water.
    Type: Application
    Filed: September 23, 2019
    Publication date: May 14, 2020
    Inventors: Jonghee PARK, Kitae KIM, Jinseock KIM, Gyu-Po KIM, Hyun-Cheol SHIN, Dae-Woo LEE, Sang-Hyuk LEE, Zheng HONG
  • Etchant composition and manufacturing method of metal pattern using the same
    Patent number: 10611962
    Abstract: An etchant composition is presented. The composition includes: 18 wt % to 25 wt % of a first organic acid compound; 15 wt % to 20 wt % of a second organic acid compound; 8.1 wt % to 9.9 wt % of an inorganic acid compound; 1 wt % to 4.9 wt % of a sulfonic acid compound; 10 wt % to 20 wt % of a hydrogen sulfate salt compound; 1 wt % to 5 wt % of a nitrogen-containing dicarbonyl compound; 1 wt % to 5 wt % of an amino acid derivative compound; 0.1 wt % to 2 wt % of an iron-containing oxidizing agent compound; and a balance amount of water.
    Type: Grant
    Filed: April 22, 2019
    Date of Patent: April 7, 2020
    Assignee: Samsung Display Co., Ltd.
    Inventors: Jong Hee Park, Ki Tae Kim, Jin Seock Kim, Gyu-Po Kim, Hyun-Cheol Shin, Dae-Woo Lee, Sang-Hyuk Lee
  • Method of preparing styrene-based resin and styrene-based resin prepared thereby
    Patent number: 10570229
    Abstract: The present invention relates to a method of preparing a styrene-based resin having a low oligomer content and a styrene-based resin prepared thereby. The preparation method according to the present invention may prepare a styrene-based resin having a reduced oligomer content by using a polymerization initiator having a 1 hour half-life temperature, which is 5° C. to 25° C. lower than a temperature during polymerization, and controlling devolatilization conditions.
    Type: Grant
    Filed: November 2, 2016
    Date of Patent: February 25, 2020
    Assignee: LG Chem, LTD.
    Inventors: Jae Bum Seo, Chang Hun Han, Dae Woo Lee, Jung Tae Park, Gyu Sun Kim
  • COPOLYMER AND METHOD FOR PREPARING THE SAME
    Publication number: 20200040115
    Abstract: The present invention relates to a copolymer including 20 to 65 wt % of units derived from an alkyl styrene-based monomer; 10 to 40 wt % of units derived from a (meth)acrylate-based monomer; and 20 to 40 wt % of units derived from vinyl cyan-based monomer, based on the total weight of the copolymer, wherein the residual monomer content is 780 ppm or less, and a method for preparing the same.
    Type: Application
    Filed: July 26, 2018
    Publication date: February 6, 2020
    Inventors: Jae Bum SEO, Dae Woo LEE, Jung Tae PARK, Gyu Sun KIM, Ji Uk JANG
  • DISPLAY DEVICE
    Publication number: 20200006446
    Abstract: A display device includes a display area and a non-display area at least partially surrounding the display area. A first display substrate includes a plurality of thin film transistors. A second display substrate is disposed opposite to the first display substrate. A seal member is disposed within the non-display area and is disposed between the first display substrate and the second display substrate. The seal member is configured to attach the first display substrate to the second display substrate. Each of the plurality of thin film transistors includes a gate electrode. The gate electrode of at least one of the plurality of thin film transistors overlaps the seal member in a thickness direction of the display device.
    Type: Application
    Filed: April 1, 2019
    Publication date: January 2, 2020
    Inventors: DAE WOO LEE, IL HUN SEO, HO JIN YOON, MIN SEONG YI, YUN MO CHUNG
  • Method of preparing aromatic vinyl-unsaturated nitrile-based copolymer and aromatic vinyl-unsaturated nitrile-based copolymer prepared using the same
    Patent number: 10519262
    Abstract: The present invention provides a method of preparing an aromatic vinyl-unsaturated nitrile-based copolymer in which, when an aromatic vinyl-unsaturated nitrile-based copolymer in which a content of a structural unit derived from unsaturated nitrile monomers in the copolymer is in the range of 22 to 30 wt % is prepared, oligomer content and unreacted monomer content are decreased, resulting in excellent heat resistance, significantly improved surface quality, and particularly, reduced generation of residue on a product surface when used in a closed high temperature environment and reduced occurrence of mold deposits during injection molding, and an aromatic vinyl-unsaturated nitrile-based copolymer prepared using the method.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: December 31, 2019
    Assignee: LG CHEM, LTD.
    Inventors: Dae Woo Lee, Chang Hun Han, Jae Bum Seo, Jung Tae Park, Gyu Sun Kim
  • ETCHANT COMPOSITION AND MANUFACTURING METHOD OF METAL PATTERN USING THE SAME
    Publication number: 20190322935
    Abstract: An etchant composition is presented. The composition includes: 18 wt % to 25 wt % of a first organic acid compound; 15 wt % to 20 wt % of a second organic acid compound; 8.1 wt % to 9.9 wt % of an inorganic acid compound; 1 wt % to 4.9 wt % of a sulfonic acid compound; 10 wt % to 20 wt % of a hydrogen sulfate salt compound; 1 wt % to 5 wt % of a nitrogen-containing dicarbonyl compound; 1 wt % to 5 wt % of an amino acid derivative compound; 0.1 wt % to 2 wt % of an iron-containing oxidizing agent compound; and a balance amount of water.
    Type: Application
    Filed: April 22, 2019
    Publication date: October 24, 2019
    Inventors: Jong Hee PARK, Ki Tae KIM, Jin Seock KIM, Gyu-Po KIM, Hyun-Cheol SHIN, Dae-Woo LEE, Sang-Hyuk LEE
  • Organic light emitting display panel
    Patent number: 10454072
    Abstract: An organic light emitting display panel includes a base substrate, a pixel defining layer disposed on the base substrate, a light emitting structure disposed in an opening of the pixel defining layer, and a mirror pattern disposed on an upper surface of the pixel defining layer. The pixel defining layer defines the opening and includes the upper surface that is in parallel with a surface of the base substrate and a side surface that is connected to the upper surface. The mirror pattern makes contact with the pixel defining layer, and entirely covers the upper surface of the pixel defining layer.
    Type: Grant
    Filed: April 6, 2018
    Date of Patent: October 22, 2019
    Assignee: Samsung Display Co., Ltd.
    Inventors: Dae-Woo Lee, Byoung-Ki Kim, Ho-Jin Yoon, Yun-Mo Chung
  • POWER CONVERSION SYSTEM FOR VEHICLES AND CONTROL METHOD THEREOF
    Publication number: 20190315233
    Abstract: A power conversion system for vehicles is provided. The system includes a switching circuit having first input/output terminals, second input/output terminals and a plurality of switching elements connected between the first input/output terminals and the second input/output terminals. A first energy storage device is connected to the second input/output terminals and has a preset charging/discharging voltage. A first voltage conversion circuit converts power output from the first input/output terminals to output a voltage less than the voltage of the first energy storage device. A second energy storage device is charged/discharged with the output voltage of the first voltage conversion circuit. A controller controls open/short-circuit states of the switching elements based on whether the first energy storage device is being charged and whether the vehicle is traveling.
    Type: Application
    Filed: September 4, 2018
    Publication date: October 17, 2019
    Inventors: In Yong Yeo, Jin Myeong Yang, Woo Young Lee, Youn Sik Lee, Dae Woo Lee, Jong Pil Kim
  • PLANAR TRANSFORMER
    Publication number: 20190318864
    Abstract: A planar transformer according to the present disclosure can include: at least one pair of cores arranged vertically and symmetrically; and a printed circuit board assembly including primary printed circuit boards having coil patterns forming a primary wiring and secondary printed circuit boards having coil patterns forming a secondary wiring, the secondary printed circuit boards respectively disposed over or under the primary printed circuit boards. The coil patterns of the primary printed circuit boards and the coil patterns of the secondary printed circuit boards can be alternately stacked.
    Type: Application
    Filed: September 25, 2018
    Publication date: October 17, 2019
    Inventors: In Yong Yeo, Jin Myeong Yang, Jae Eun Cha, Dae Woo Lee, Woo Young Lee
  • POWER CONVERSION SYSTEM FOR VEHICLES
    Publication number: 20190312499
    Abstract: A power conversion system for vehicles is provided. The system includes a first energy storage device and a charging device with a rectification circuit for rectifying AC power to generate a DC link voltage. A DC-DC converter converts the level of the DC link voltage to generate a charging voltage of the first energy storage device. A low voltage DC-DC converter selectively down-converts one of the voltage of the first energy storage device and the DC link voltage to output a low voltage having a predetermined level. The low voltage DC-DC converter selectively converts one of the voltage of the first energy storage device and the DC link voltage into the low voltage based on whether the first energy storage device is charged according to input of the AC power.
    Type: Application
    Filed: October 5, 2018
    Publication date: October 10, 2019
    Inventors: Tae Jong Ha, In Yong Yeo, Dae Woo Lee, Youn Sik Lee
  • LOW VOLTAGE DC-DC CONVERTER FOR VEHICLE AND METHOD OF CONTROLLING THE SAME
    Publication number: 20190273441
    Abstract: A low voltage DC-DC converter for a vehicle includes: a switching circuit including a plurality of capacitors and a plurality of switches and converting a high voltage output from a high voltage battery into an AC voltage; a transformer converting the AC voltage output from the switching circuit into a low voltage; a current sensor measuring a current value output from the transformer; and a controller comparing the current value measured by the current sensor with a reference value to determine whether a current mode is a continuous current mode or a discontinuous current mode, and controlling one of the plurality of switches to be turned on or off as the determination result.
    Type: Application
    Filed: September 17, 2018
    Publication date: September 5, 2019
    Inventors: Dae Woo LEE, Woo Young LEE, Min Seong CHOI, Tae Jong HA, Jae Eun CHA, Jin Myeong YANG, In Yong YEO
  • Low voltage DC-DC converter for vehicle and method of controlling the same
    Patent number: 10404179
    Abstract: A low voltage DC-DC converter for a vehicle includes: a switching circuit including a plurality of capacitors and a plurality of switches and converting a high voltage output from a high voltage battery into an AC voltage; a transformer converting the AC voltage output from the switching circuit into a low voltage; a current sensor measuring a current value output from the transformer; and a controller comparing the current value measured by the current sensor with a reference value to determine whether a current mode is a continuous current mode or a discontinuous current mode, and controlling one of the plurality of switches to be turned on or off as the determination result.
    Type: Grant
    Filed: September 17, 2018
    Date of Patent: September 3, 2019
    Assignees: HYUNDAI MOTOR COMPANY, KIA MOTORS CORPORATION
    Inventors: Dae Woo Lee, Woo Young Lee, Min Seong Choi, Tae Jong Ha, Jae Eun Cha, Jin Myeong Yang, In Yong Yeo
  • Display devices including mirror substrates and methods of manufacturing mirror substrates
    Patent number: 10371986
    Abstract: A display device may include a display unit disposed on a substrate and a mirror substrate facing the substrate with respect to the display unit. The mirror substrate may include a first mirror layer extending continuously on a surface of a transparent substrate and a plurality of mirror patterns on the first mirror layer. The first mirror layer is formed on both a region in which the plurality of mirror patterns are formed and a region in which the plurality of mirror patterns are not formed. External light is incident to and reflected by the first mirror layer, thus reducing an image haze and enhancing a display quality of the display device. In addition, the first mirror layer and the plurality of mirror patterns may be formed by using a single halftone mask to simplify the manufacturing process and increase a productivity of the mirror substrate.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: August 6, 2019
    Assignee: Samsung Display Co., Ltd.
    Inventors: Dae-Woo Lee, Byoung-Ki Kim, Ho-Jin Yoon, Yun-Mo Chung
  • Display device
    Patent number: 10304912
    Abstract: A display device may include a light-emitting element and a controllable element. The light-emitting element may emit a light. The controllable element may neighbor the light-emitting element in a plan view of the display device and may include a fluid set. The fluid set may include at least one of a light-reflecting element set and a black element set. The controllable element may have a first average reflectance value in a first direction if the controllable element receives no voltage or receives a first voltage. The controllable element may have a second average reflectance value in the first direction if the controllable element receives a second voltage. The second voltage may be unequal to the first voltage. The second average reflectance value may be unequal to the first average reflectance value.
    Type: Grant
    Filed: January 10, 2017
    Date of Patent: May 28, 2019
    Assignee: Samsung Display Co., Ltd.
    Inventors: Byoungki Kim, Jongsung Bae, Hojin Yoon, Dae Woo Lee, Yun-Mo Chung