Patents by Inventor Sung Tae Ahn
Sung Tae Ahn 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: 8779037Abstract: A polycarbonate resin composition is provided. The composition comprises (A) 50 to 90% by weight of a polycarbonate resin, (B) 5 to 30% by weight of a polymethyl methacrylate resin, (C) 5 to 20% by weight of a phosphate compound, (D) 0.01 to 2% by weight of a metal sulfonate as an organic salt, and (E) 0.05 to 2% by weight of a fluorinated olefin. The composition is highly flame retardant and scratch resistant.Type: GrantFiled: December 28, 2008Date of Patent: July 15, 2014Assignee: LG Chem, Ltd.Inventors: Seon Mo Son, Kyung Mo Park, Sung Tae Ahn, Yong Kim
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Publication number: 20140114001Abstract: Disclosed is a glass fiber-reinforced polycarbonate flame-retardant resin composition which comprises (A) 50 to 75% by weight of polycarbonate having a melt index of 22 g/10 min or more (300° C., 1.2 kg), (B) 3 to 15% by weight of a rubber-modified styrene-based graft copolymer, (C) 3 to 10% by weight of a bulk copolymer of an aromatic vinyl compound and a vinyl cyan compound, (D) 1 to 10% by weight of an ethylene acrylate-based copolymer, (E) 10 to 25% by weight of glass fiber, and (F) 5 to 20% by weight of an aromatic phosphate ester-based compound, and thus advantageously exhibits superior flowability, flame retardancy, hardness, impact resistance and appearance qualities.Type: ApplicationFiled: November 6, 2013Publication date: April 24, 2014Applicant: LG CHEM, LTD.Inventors: Jong Kuk CHOI, Yong KIM, Myeung Il KIM, Dae Yong OK, Sung Tae AHN
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Patent number: 8669342Abstract: The invention provides a non-painting and high-gloss polycarbonate resin composition. Specifically, the invention provides a polycarbonate resin composition having a superior impact strength, heat-resistance, electric characteristics, weather resistance, and light resistance. In certain embodiments, the resin composition of the invention is obtained by mixing a butadiene-based impact modifier, such as acrylonitrile-butadiene-styrene (ABS) or methacrylate-butadiene-styrene and an acryl-based impact modifier in polycarbonate resin, followed by adding an ultraviolet (UV) absorbent to the mixture.Type: GrantFiled: December 12, 2012Date of Patent: March 11, 2014Assignees: Hyundai Motor Company, Kia Motors Corporation, LG Chem. Ltd.Inventors: Dae Sik Kim, Jung Gyun Noh, Kyeong Hoon Jang, Hyun Joon Choi, Yong Kim, Sung Tae Ahn, Min Han Kwak
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Publication number: 20140058024Abstract: A non-halogen flame retardant and high rigidity polycarbonate resin composition is disclosed. The non-halogen flame retardant and high rigidity polycarbonate resin composition has excellent flame retardancy and rigidity by overcoming a conventional problem such as poor rigidity occurred, upon adding a flame retardant agent in polycarbonate resin composition reinforced with a glass fiber having improved rigidity such as flexibility and surface smoothness etc., imposed by the use of the glass fiber. The polycarbonate resin composition has excellent fluidity, appearance surface quality and flexibility, together with high impact resistance and toughness, and also flame retardancy.Type: ApplicationFiled: January 29, 2013Publication date: February 27, 2014Applicant: LG CHEM, LTD.Inventors: Sun Mo Son, Ryul Lee, Sung Ho Lee, Sung Tae Ahn, Su Kyoung Lee, Jong Wan Kim
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Publication number: 20140045968Abstract: The invention provides a non-painting and high-gloss polycarbonate resin composition. Specifically, the invention provides a polycarbonate resin composition having a superior impact strength, heat-resistance, electric characteristics, weather resistance, and light resistance. In certain embodiments, the resin composition of the invention is obtained by mixing a butadiene-based impact modifier, such as acrylonitrile-butadiene-styrene (ABS) or methacrylate-butadiene-styrene and an acryl-based impact modifier in polycarbonate resin, followed by adding an ultraviolet (UV) absorbent to the mixture.Type: ApplicationFiled: December 12, 2012Publication date: February 13, 2014Applicants: HYUNDAI MOTOR COMPANY, LG CHEM. LTD., KIA MOTORS CORPORATIONInventors: Dae Sik Kim, Jung Gyun Noh, Kyeong Hoon Jang, Hyun Joon Choi, Yong Kim, Sung Tae Ahn, Min Han Kwak
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Patent number: 8378024Abstract: The present invention relates to a low surface gloss styrene resin composition. The composition of the present invention is composed of (A) 80-99.9 weight % of the basic resin comprising rubber-modified styrene resin and (B) 0.1-20 weight % of syndiotactic polystyrene, the matting agent. The composition also includes (C) hydrogenated styrene block copolymer comprising styrene block and butadiene rubber block as a compatibilizer by 0.1-20 weight % for the total weight of the low surface gloss styrene resin composed of (A) the basic resin and (B) the matting agent and additionally includes (D) a plasticizer by 0.1-30 weight %. The composition of the present invention has excellent weatherability and impact-resistance in addition to the low surface gloss properties, so that it can be applied in various products, particularly exterior products for structures such as sidings and window frames, etc.Type: GrantFiled: January 30, 2008Date of Patent: February 19, 2013Assignee: LG Chem, Ltd.Inventors: Yun-kyoung Cho, Seon-mo Son, Bong-keun Lee, Tae-bin Ahn, Han-jong You, Sung-tae Ahn
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Publication number: 20110184102Abstract: Provided is a thermoplastic polycarbonate resin composition. The resin composition contains (A) 83 to 93% by weight of a polycarbonate resin, (B) 6 to 17% by weight of aromatic phosphate, and (C) 0.08 to 0.3% by weight of fluoroolefin. The resin composition exhibits excellent infrared transmissivity and flame retardancy.Type: ApplicationFiled: December 5, 2008Publication date: July 28, 2011Applicant: LG CHEM, LTD.Inventors: Bo Ri Kim, Kyung Mo Park, Sun Woo Hwang, Sung Tae Ahn
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Publication number: 20110124781Abstract: A polycarbonate resin composition is provided. The composition comprises (A) 50 to 90% by weight of a polycarbonate resin, (B) 5 to 30% by weight of a polymethyl methacrylate resin, (C) 5 to 20% by weight of a phosphate compound, (D) 0.01 to 2% by weight of a metal sulfonate as an organic salt, and (E) 0.05 to 2% by weight of a fluorinated olefin. The composition is highly flame retardant and scratch resistant.Type: ApplicationFiled: December 28, 2008Publication date: May 26, 2011Applicant: LG CHEM, LTD.Inventors: Seon Mo Son, Kyung Mo Park, Sung Tae Ahn, Yong Kim
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Publication number: 20100075165Abstract: The present invention relates to a low surface gloss styrene resin composition. The composition of the present invention is composed of (A) 80-99.9 weight % of the basic resin comprising rubber-modified styrene resin and (B) 0.1-20 weight % of syndiotactic polystyrene, the matting agent. The composition also includes (C) hydrogenated styrene block copolymer comprising styrene block and butadiene rubber block as a compatibilizer by 0.1-20 weight % for the total weight of the low surface gloss styrene resin composed of (A) the basic resin and (B) the matting agent and additionally includes (D) a plasticizer by 0.1-30 weight %. The composition of the present invention has excellent weatherability and impact-resistance in addition to the low surface gloss properties, so that it can be applied in various products, particularly exterior products for structures such as sidings and window frames, etc.Type: ApplicationFiled: January 30, 2008Publication date: March 25, 2010Applicant: LG CHEM, LTD.Inventors: Yun-kyoung Cho, Seon-mo Son, Bong-keun Lee, Tae-bin Ahn, Han-jong You, Sung-tae Ahn
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Patent number: 7396877Abstract: Disclosed is a resin composition comprising (A) 100 parts by weight of a base resin comprising a rubber-modified styrene-containing graft copolymer and a styrene-containing copolymer; (B) 0.5-8 parts by weight of an acrylic rubber graft copolymer resin having an average particle size of 0.1-0.5 ?m; and (C) 0.5-8 parts by weight of a graft copolymer resin comprising an ethylene ?-olefinic copolymer rubber having an average particle size of 0.1-0.8 ?m. The thermoplastic resin composition of the present invention greatly improves chemical resistance to insulating materials, such as urethane foam, or foaming agent compounds, such as freon (CFC-11, HCFC-141b, HFC-245fa, HFC-245eb, HFC-245ca, HFC-356mffm) and cyclopentane and offers superior impact strength, whiteness and processability. It can be useful for extrusion sheets of refrigerator interiors.Type: GrantFiled: October 12, 2005Date of Patent: July 8, 2008Assignee: LG Chem, Ltd.Inventors: Sung-je Cha, Sung-tae Ahn, Dong-chul Kim, Yun-kyoung Cho
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Publication number: 20070100080Abstract: The present invention relates to a method and an apparatus for the production of polyvinyl alcohol, and more precisely, a method and an apparatus for the production of polyvinyl alcohol in which the saponification of a mixture of polyvinyl ester solution and a catalyst is induced in a reactor equipped with a planetary stirrer coated with one or more coating agents selected from a group consisting of fluororesin, silicon resin and epoxy resin. According to the present invention, the method and apparatus of the present invention have advantages for the production of polyvinyl alcohol such as inhibiting gelation during the conversion of polyvinyl ester into polyvinyl alcohol, thereby enabling the preparation of polyvinyl alcohol with a high degree of saponification, a high degree of polymerization and high apparent gravity, reducing the amount of a solvent used and thereby requiring a smaller reactor, resulting in the reduction of the apparatus cost and the solvent recovery cost.Type: ApplicationFiled: October 23, 2006Publication date: May 3, 2007Applicant: LG CHEM, LTD.Inventors: Sam-hun YUN, Seon-wook KIM, Jeong-seok LEE, Sung-tae AHN
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Publication number: 20070027256Abstract: The present invention relates to an acrylic rubber-modified copolymer and the styrenic thermoplastics composition using the same. More particularly, the present invention relates to the styrenic thermoplastics composition having superior appearance and thermoformability, which is obtained by adding 0.5-20 parts by weight of an acrylic rubber-modified copolymer having a rubber particle size ranging from 800 to 6, 000 ?to 100 parts by weight of a resin of 10-50 parts by weight of a graft copolymer comprising rubber-modified styrene and 30-70 parts by weight of a copolymer comprising styrene.Type: ApplicationFiled: October 8, 2004Publication date: February 1, 2007Applicant: LG CHEM. LTD.Inventors: Dong-chul Kim, Chan-hong Lee, Sung-je Cha, Yun-kyoung Cho, Sung-tae Ahn
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Patent number: 7068248Abstract: A single-chip column driver for organic light emitting diode (OLED) display is disclosed. Instead of using two column drivers for dual scan, the present invention uses one column driver driving both the upper and the lower OLED panels. The column driver has a two set of output circuitry: one for driving the upper panel and the other for driving the lower panel. The single chip solution of the present invention eliminates the problem of display uniformity without increasing the part count. The invention also enables independent control of RGB without further increasing the part count.Type: GrantFiled: August 30, 2002Date of Patent: June 27, 2006Assignee: Leadis Technology, Inc.Inventors: Sung Tae Ahn, Keunmyung Lee, Dae Young Ahn, Tae Kwang Park
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Publication number: 20060079639Abstract: Disclosed is a resin composition comprising (A) 100 parts by weight of a base resin comprising a rubber-modified styrene-containing graft copolymer and a styrene-containing copolymer; (B) 0.5-8 parts by weight of an acrylic rubber graft copolymer resin having an average particle size of 0.1-0.5 ?m; and (C) 0.5-8 parts by weight of a graft copolymer resin comprising an ethylene ?-olefinic copolymer rubber having an average particle size of 0.1-0.8 ?m. The thermoplastic resin composition of the present invention greatly improves chemical resistance to insulating materials, such as urethane foam, or foaming agent compounds, such as freon (CFC-11, HCFC-141b, HFC-245fa, HFC-245eb, HFC-245ca, HFC-356mffm) and cyclopentane and offers superior impact strength, whiteness and processability. It can be useful for extrusion sheets of refrigerator interiors.Type: ApplicationFiled: October 12, 2005Publication date: April 13, 2006Inventors: Sung-je Cha, Sung-tae Ahn, Dong-chul Kim, Yun-kyoung Cho
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Patent number: 7015889Abstract: A scheme to reduce output variations in a column driver for a flat-panel display by sharing the characteristics of analog circuit is disclosed. An input multiplexer is provided between two neighboring digital inputs, and an output multiplexer is provided between two neighboring analog outputs so that the characteristics of neighboring analog circuits can be shared by multiplexing. The averaging effect by sharing reduces variations in the output. The multiplexing may be done either in time division or on a frame-by-frame basis.Type: GrantFiled: August 30, 2002Date of Patent: March 21, 2006Assignee: Leadis Technology, Inc.Inventors: Sung Tae Ahn, Yung Jin Jeon, Chan Young Jeong, Keunmyung Lee
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Publication number: 20030058233Abstract: A scheme to reduce output variations in a column driver for a flat-panel display by sharing the characteristics of analog circuit is disclosed. An input multiplexer is provided between two neighboring digital inputs, and an output multiplexer is provided between two neighboring analog outputs so that the characteristics of neighboring analog circuits can be shared by multiplexing. The averaging effect by sharing reduces variations in the output. The multiplexing may be done either in time division or on a frame-by-frame basis.Type: ApplicationFiled: August 30, 2002Publication date: March 27, 2003Inventors: Sung Tae Ahn, Yung Jin Jeon, Chen Young Jeong, Keunmyung Lee
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Publication number: 20030058203Abstract: A single-chip column driver for organic light emitting diode (OLED) display is disclosed. Instead of using two column drivers for dual scan, the present invention uses one column driver driving both the upper and the lower OLED panels. The column driver has a two set of output circuitry: one for driving the upper panel and the other for driving the lower panel. The single chip solution of the present invention eliminates the problem of display uniformity without increasing the part count. The invention also enables independent control of RGB without further increasing the part count.Type: ApplicationFiled: August 30, 2002Publication date: March 27, 2003Inventors: Sung Tae Ahn, Keunmyung Lee, Dae Young Ahn, Tae Kwang Park
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Patent number: 6160393Abstract: A bandgap voltage reference circuit according to the present invention generates a constant reference voltage and is not affected by variations in a power supply voltage and in a manufacturing process. In the bandgap voltage reference circuit, a constant voltage supply unit supplies a constant voltage, a first current mirror mirrors a first current flowing through the constant voltage supply unit to generate a second current, and a second current mirror controlled by the constant voltage from the constant voltage supply unit mirrors the second current to generate a third current and outputs the third current to an output node. A voltage reference unit is connected to the output node to provide a reference voltage to the output node. The voltage reference unit includes at least one PMOS transistor and at least one NMOS transistor which are connected to each other in series or in parallel.Type: GrantFiled: October 14, 1999Date of Patent: December 12, 2000Assignee: Samsung Electronics Co., Ltd.Inventors: Sung-tae Ahn, Yong-jin Jeon
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Patent number: 6008107Abstract: An integrated circuit device is fabricated upon a semi-conductor wafer by first forming a stop layer upon the surface of the wafer. Holes are formed through the stop layer and wells are formed in the semiconductor material of the semiconductor wafer below the openings. A dielectric layer is formed over the surface of the device substantially filling the wells and covering the stop layer. The dielectric layer is then planarized to substantially the level of the stop layer. A PAD oxide layer is provided between the stop layer and the surface of the semiconductor device. Conventional thin film oxidation of the wells and implants into the side walls of the wells are performed. An abrasive mechanical polisher is used to perform the planarization wherein the mechanical polisher is provided with the self-stopping feature when it encounters the stop layer.Type: GrantFiled: July 23, 1997Date of Patent: December 28, 1999Assignee: National Semiconductor CorporationInventors: John M. Pierce, Sung Tae Ahn
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Patent number: 5990514Abstract: A nonvolatile semiconductor memory device includes a plurality of floating gate type memory cell transistors having control gates. Word lines are integrally formed with the control gates, and boosting lines are self-aligned with the word lines. During programming, a first voltage is applied to a selected word line, and then a second voltage is applied to the boosting line over the selected word line. The voltage on the selected word line is then increased by capacitive coupling of the second voltage thereon, thereby programming at least one selected memory cell transistor. Therefore, a voltage lower than a program voltage is used on a selected word line, thereby reducing chip area and enhancing programming speed.Type: GrantFiled: October 2, 1998Date of Patent: November 23, 1999Assignee: Samsung Electronics Co., Ltd.Inventors: Jung-Dal Choi, Sung-Tae Ahn