Patents by Inventor Tae-Hwan Jang
Tae-Hwan Jang 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).
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Patent number: 10224644Abstract: A series-fed E-shaped patch antenna array has co-polarized parasitic patches to improve aperture efficiency. Each of microstrip parasitic patches is inserted between a plurality of microstrip E-shaped patch antennas. The parasitic patches are co-polarized with the E-shaped patch antennas so that the current flows in the parasitic patches and the E-shaped patch antennas have the same polarity. Additional radiation from the co-polarized microstrip parasitic patches significantly improves gain flatness, gain and aperture efficiency due to offset resonance frequency.Type: GrantFiled: November 7, 2017Date of Patent: March 5, 2019Assignee: Korea Advanced Institute of Science and TechnologyInventors: Chul-Soon Park, Tae-Hwan Jang, Hong-Yi Kim
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Publication number: 20190067834Abstract: A series-fed E-shaped patch antenna array has co-polarized parasitic patches to improve aperture efficiency. Each of microstrip parasitic patches is inserted between a plurality of microstrip E-shaped patch antennas. The parasitic patches are co-polarized with the E-shaped patch antennas so that the current flows in the parasitic patches and the E-shaped patch antennas have the same polarity. Additional radiation from the co-polarized microstrip parasitic patches significantly improves gain flatness, gain and aperture efficiency due to offset resonance frequency.Type: ApplicationFiled: November 7, 2017Publication date: February 28, 2019Applicant: Korea Advanced Institute of Science and TechnologyInventors: Chul-Soon Park, Tae-Hwan Jang, Hong-Yi Kim
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Publication number: 20180265646Abstract: The present invention relates to a method for preparing a superabsorbent polymer, and a superabsorbent polymer prepared thereby. A superabsorbent polymer prepared by the preparation method exhibits minimized deterioration of physical properties after being pulverized, and thus basic absorbance performance is excellent and an excellent liquid permeability and absorbance rate can be exhibited.Type: ApplicationFiled: April 15, 2016Publication date: September 20, 2018Applicant: LG Chem, Ltd.Inventors: Hye Mi Nam, Min Ho Hwang, Sang Gi Lee, Tae Hwan Jang, Soo Jin Lee
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Publication number: 20180265645Abstract: The present invention relates to a method for manufacturing a super absorbent resin, the method for manufacturing a super absorbent resin can provide a super absorbent resin which has an optimized pore size and porosity, wherein an absorbent surface area is increased accordingly. The super absorbent resin can exhibit a fast absorption rate under pressure and under no-pressure.Type: ApplicationFiled: April 15, 2016Publication date: September 20, 2018Applicant: LG Chem, Ltd.Inventors: Hye Mi Nam, Sang Gi Lee, Soo Jin Lee, Tae Hwan Jang, Min Ho Hwang
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Publication number: 20180257059Abstract: The preparation method of superabsorbent polymer according to the present invention can increase suction power without degradation of other properties of superabsorbent polymer, and thus, the prepared superabsorbent polymer may be usefully used as material of hygienic goods such as a diaper.Type: ApplicationFiled: December 14, 2015Publication date: September 13, 2018Applicant: LG Chem, Ltd.Inventors: Seong Beom HEO, Tae Hwan JANG, Mi Young KIM, Jiyoon JEONG, Bhom Ri KIM
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Publication number: 20180243464Abstract: Provided is a method of preparing a superabsorbent polymer which exhibits more improved liquid permeability and absorption rate while maintaining excellent absorption performance. The method of preparing the superabsorbent polymer may include the steps of: performing crosslinking polymerization of water-soluble ethylene-based unsaturated monomers having acidic groups which are at least partially neutralized in the presence of an internal crosslinking agent to form a water-containing gel polymer including a crosslinked polymer; drying, pulverizing, and size-sorting the water-containing gel polymer to form a base polymer powder; performing surface-crosslinking of the base polymer powder using a surface-crosslinking solution including one or more surface-crosslinking agents in the presence of first alumina particles; and adding second alumina particles to the surface-crosslinked base polymer powder and then mixing them with each other.Type: ApplicationFiled: June 13, 2016Publication date: August 30, 2018Applicant: LG Chem, Ltd.Inventors: Min Ho HWANG, Hye Mi NAM, Sang Gi LEE, Soo Jin LEE, Tae Hwan JANG
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Publication number: 20180228671Abstract: The present invention relates to a method for a superabsorbent polymer. The preparation method controls the time from the addition of a foaming agent to the initiation of a polymerization reaction, thereby forming an appropriate pore structure in a superabsorbent polymer. The superabsorbent polymer produced through the preparation method can exhibit a remarkably improved absorption rate while exhibiting excellent absorption performance.Type: ApplicationFiled: April 29, 2016Publication date: August 16, 2018Applicant: LG Chem, Ltd.Inventors: Min Ho Hwang, Sang Gi Lee, Hye Mi Nam, Soo Jin Lee, Tae Hwan Jang
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Publication number: 20180175506Abstract: An antenna device includes a horn antenna including a waveguide and a horn connected to the waveguide, the horn having a shape widening toward an opening direction, a beamforming network including a plurality of input ports and a plurality of output ports and changing a phase of output port signals output from the output ports based on input port signals applied to the input ports, and an antenna array disposed in the horn antenna and connected to the output ports of the beamforming network.Type: ApplicationFiled: December 14, 2017Publication date: June 21, 2018Applicant: Korea Advanced Institute of Science and TechnologyInventors: Chul-Soon PARK, Tae-Hwan JANG, Hong-Yi KIM
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Publication number: 20180147557Abstract: The present invention relates to a method for preparing superabsorbent polymer that has not only excellent permeability and absorption speed, but also minimized absorbency under pressure decrease rate, and superabsorbent polymer prepared thereby.Type: ApplicationFiled: July 11, 2016Publication date: May 31, 2018Applicant: LG Chem, Ltd.Inventors: Min Ho Hwang, Hye Mi Nam, Sang Gi Lee, Soo Jin Lee, Tae Hwan Jang
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Publication number: 20180079847Abstract: The present invention relates to a super absorbent polymer. In the super absorbent polymer according to the present invention, the content of each of the super absorbent polymer particles having different surface shapes among particles constituting the polymer is optimized, and this not only an absorbent capacity and an absorbency under load are excellent but also the rewetting phenomenon can be effectively prevented.Type: ApplicationFiled: June 10, 2016Publication date: March 22, 2018Applicant: LG Chem, Ltd.Inventors: Sang Gi Lee, Hye Mi Nam, Min Ho Hwang, Soo Jin Lee, Tae Hwan Jang
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Publication number: 20180056274Abstract: The present invention relates to a super absorbent resin, and the super absorbent resin can exhibit a fast absorption rate and high gel strength even in a partially swollen state through the size optimization of partially swollen gel particles. Therefore, the use of the super absorbent resin can effectively prevent a rewetting phenomenon.Type: ApplicationFiled: June 1, 2016Publication date: March 1, 2018Applicant: LG Chem, Ltd.Inventors: Sang Gi Lee, Hye Mi Nam, Min Ho Hwang, Soo Jin Lee, Tae Hwan Jang
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Patent number: 9901904Abstract: Provided are a superabsorbent polymer and a preparation method thereof. The superabsorbent polymer according to the present invention has excellent gel bed permeability (GBP) and suction power, thereby being usefully applied to hygiene products such as diapers.Type: GrantFiled: November 24, 2015Date of Patent: February 27, 2018Assignee: LG Chem, Ltd.Inventors: Tae Hwan Jang, Seong Beom Heo, Mi Young Kim, Min Gyu Kim
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Publication number: 20180050321Abstract: The present invention relates to a super absorbent polymer having not only excellent absorption rate and absorbency under load but also excellent rewetting properties, and a method for preparing the same.Type: ApplicationFiled: November 17, 2016Publication date: February 22, 2018Applicant: LG Chem, Ltd.Inventors: Sang Gi Lee, Hye Mi Nam, Min Ho Hwang, Soo Jin Lee, Tae Hwan Jang
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Publication number: 20180037686Abstract: The present invention provides a method for preparing a superabsorbent polymer, the method comprising the steps of: forming a function gel polymer by cross-linked polymerization of a monomer mixture under the presence of an internal cross-linking agent, the monomer mixture including a water-soluble ethylene-based unsaturated monomer having an acid group at least part of which is neutralized, a carbonate, a volatile organic solvent, a surfactant, and a bubble promoting agent; forming a base resin powder by drying, grinding, and classifying the function gel polymer; and forming a surface cross-linked layer by additional cross-linking of the surface of the base resin powder under the presence of a surface cross-linking agent. The method for preparing a superabsorbent polymer may provide a superabsorbent polymer which has a porous structure, thereby exhibiting an excellent absorption rate while exhibiting excellent gel strength.Type: ApplicationFiled: April 11, 2016Publication date: February 8, 2018Applicant: LG Chem, Ltd.Inventors: Soo Jin Lee, Hye Mi Nam, Sang Gi Lee, Min Ho Hwang, Tae Hwan Jang
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Publication number: 20170141472Abstract: Disclosed is a millimeter wave antenna for diagonal radiation. A first metal layer and a second metal layer having a form of microstrip wire are coated on the bottom surface and at least a partial region of the top surface of a dielectric substrate, respectively. When viewed in a direction perpendicular to the top surface of the dielectric substrate, the second metal layer is covered by the first metal layer. The microstrip wire of the second metal layer may have a length of more than half of a wavelength of a RF signal. The long-wire antenna has a radiation pattern in upward diagonal direction when a signal to transmit is fed under a condition that the first metal layer is grounded. The form of the second metal layer may be a straight line, Y-shape, ?-shape, or etc. An impedance matching metal layer may be added to the second metal layer.Type: ApplicationFiled: January 26, 2016Publication date: May 18, 2017Inventors: Chul-Soon PARK, Tae-Hwan JANG, Hong-Yi KIM, Chae-Jun LEE
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Publication number: 20170009026Abstract: The present invention relates to a super absorbent polymer and a method for preparing the same. The present invention has features that it is possible to prepare a super absorbent resin that can have an improved centrifuge retention capacity (CRC) and a high absorbency under load (AUL) by controlling the shape and size of the chopper die holes during coarse pulverization of a hydrous gel phase polymer.Type: ApplicationFiled: November 11, 2015Publication date: January 12, 2017Applicant: LG Chem, Ltd.Inventors: Hye Mi Nam, Sang Gi Lee, Tae Hwan Jang, Min Ho Hwang, Soo Jin Lee
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Publication number: 20160361703Abstract: Provided are a superabsorbent polymer and a preparation method thereof. The superabsorbent polymer according to the present invention has excellent gel bed permeability (GBP) and suction power, thereby being usefully applied to hygiene products such as diapers.Type: ApplicationFiled: November 24, 2015Publication date: December 15, 2016Applicant: LG Chem, Ltd.Inventors: Tae Hwan Jang, Seong Beom Heo, Mi Young Kim, Min Gyu Kim
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Patent number: 5508381Abstract: The present invention provides an improved process for preparing a highly water absorbent resin having a superior suction power and excellent gel strength, which consists essentially of:(1) neutralizing acrylic acid to a neutralization degree ranging from 50 to 100% based on the total number of moles of the acid employed and polymerizing it by a reverse phase suspension polymerization to provide a neutralized polymer;(2) dehydrating the polymer until its water content reaches 25% by weight or less based on the weight of the polymer through an azeotropic distillation thereof in the presence of a lipophilic solvent;(3) crosslinking the dehydrated polymer in the presence of a hydrophilic crosslinking agent containing at least two epoxy groups in an amount ranging from 0.05 to 5.0% by weight and water added in an amount ranging from 7.0 to 25.Type: GrantFiled: June 15, 1994Date of Patent: April 16, 1996Assignee: Lucky LimitedInventors: Tae-Hwan Jang, Su-Beom Choi, Hyung-Mann Lee, Myung-Joong Kim