Patents by Inventor Bum-Gyu Choi

Bum-Gyu 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).

  • Publication number: 20140039113
    Abstract: Provided are a curable composition and its use. The curable composition can exhibit excellent processibility and workability. The curable composition exhibits excellent light extraction efficiency, hardness, thermal and shock resistance, moisture resistance, gas permeability and adhesiveness, after curing. In addition, the curable composition can provide a cured product that exhibits long-lasting durability and reliability even under harsh conditions, and that does not cause whitening and surface stickiness.
    Type: Application
    Filed: July 29, 2013
    Publication date: February 6, 2014
    Applicant: LG CHEM, LTD.
    Inventors: Min Jin KO, Jae Ho Jung, Bum Gyu Choi, Min A. Yu
  • Publication number: 20140031509
    Abstract: Provided are a curable composition and its use. The curable composition can exhibit excellent processibility and workability. The curable composition exhibits excellent light extraction efficiency, hardness, thermal and shock resistance, moisture resistance, gas permeability and adhesiveness, after curing. In addition, the curable composition can provide a cured product that exhibits long-lasting durability and reliability, and that does not cause whitening and surface stickiness even under harsh conditions.
    Type: Application
    Filed: July 29, 2013
    Publication date: January 30, 2014
    Applicant: LG CHEM, LTD.
    Inventors: Min Jin Ko, Bum Gyu Choi, Jae Ho Jung, Dae Ho Kang, Min Kyoun Kim, Byung Kyu Cho
  • Publication number: 20140031510
    Abstract: Provided are a curable composition and its use. The curable composition can exhibit excellent processability and workability. The curable composition exhibits excellent light extraction efficiency, hardness, thermal and shock resistance, moisture resistance, gas permeability, and adhesiveness, after curing. In addition, the curable composition can provide a cured product that exhibits long-lasting durability and reliability even under harsh conditions and that does not cause whitening or surface stickiness.
    Type: Application
    Filed: September 18, 2013
    Publication date: January 30, 2014
    Applicant: LG CHEM, LTD.
    Inventors: Min Jin KO, Bum Gyu CHOI, Jae Ho JUNG, Dae Ho KANG, Min Kyoun KIM, Byung Kyu CHO
  • Publication number: 20130296515
    Abstract: A curable composition and use thereof are provided. The exemplary curable composition can show excellent processability and workability. Also, the curable composition can have a high refractive index before or after curing. The composition has low moisture permeability before or after curing and shows excellent crack resistance, thermal shock resistance, adhesive property and hardness. In addition, the composition does not cause color change such as whitening under a high-temperature or high-humidity condition, and does not exhibit stickiness on a surface thereof. The curable composition may be used as an adhesive material or as an encapsulation material for semiconductor devices such as an LED, a CCD, a photo coupler, or a photovoltaic cell.
    Type: Application
    Filed: July 5, 2013
    Publication date: November 7, 2013
    Inventors: Bum Gyu Choi, Min Jin Ko, Myung Sun Moon, Jae Ho Jung, Dae Ho Kang, Min Kyoun Kim, Byung Kyu Cho
  • Publication number: 20130293808
    Abstract: A curable composition and use thereof are provided. The exemplary curable composition can show excellent processability and workability. Also, the curable composition can have a high refractive index before or after curing. The composition has low moisture permeability before or after curing and shows excellent crack resistance, thermal shock resistance, adhesive property and hardness. In addition, the composition does not cause color change such as whitening under a high-temperature or high-humidity condition, and does not exhibit stickiness on a surface thereof. The curable composition may be used as an adhesive material or as an encapsulation material for semiconductor devices such as an LED, a CCD, a photo coupler, or a photovoltaic cell.
    Type: Application
    Filed: July 5, 2013
    Publication date: November 7, 2013
    Inventors: Bum Gyu CHOI, Min Jin KO, Myung Sun MOON, Jae Ho JUNG, Dae Ho KANG, Min Kyoun KIM, Byung Kyu CHO
  • Publication number: 20130296521
    Abstract: A curable composition and the use thereof are provided. The exemplary curable composition can show excellent processability and workability. Also, the curable composition can have a high refractive index before or after curing. The composition has low moisture permeability before or after curing and shows excellent crack resistance, thermal shock resistance, adhesive property and hardness. In addition, the composition does not cause color change such as whitening under a high-temperature or high-humidity condition, and does not exhibit stickiness on a surface thereof. The curable composition may be used as an adhesive material or as an encapsulation material for semiconductor devices such as an LED, a CCD, a photo coupler, or a photovoltaic cell.
    Type: Application
    Filed: July 5, 2013
    Publication date: November 7, 2013
    Inventors: Bum Gyu Choi, Min Jin Ko, Myung Sun Moon, Jae Ho Jung, Dae Ho Kang, Min Kyoun Kim, Byung Kyu Cho
  • Publication number: 20130296514
    Abstract: A curable composition and use thereof are provided. The exemplary curable composition can show excellent processability and workability. Also, the curable composition can have a high refractive index before or after curing. The composition has low moisture permeability before or after curing and shows excellent crack resistance, thermal shock resistance, adhesive property and hardness. In addition, the composition does not cause color change such as whitening, under a high-temperature or high-humidity condition, and does not exhibit stickiness on a surface thereof. The curable composition may be used as an adhesive material or as an encapsulation material for semiconductor devices such as an LED, a CCD, a photo coupler, or a photovoltaic cell.
    Type: Application
    Filed: July 5, 2013
    Publication date: November 7, 2013
    Inventors: Bum Gyu CHOI, Min Jin KO, Myung Sun MOON, Jae Ho JUNG, Dae Ho KANG, Min Kyoun KIM, Byung Kyu CHO
  • Patent number: 8557141
    Abstract: The present invention relates to a novel gelling agent comprising of a silane-amide chemical structure, a liquid crystal gel comprising the same and a liquid crystal device comprising said liquid crystal gel. The liquid crystal gel comprised of the novel gelling agent has excellent compatibility with other materials, and has excellent stability and solubility during manufacturing process of the same, and thus it can be applied to the production of a highly adaptable liquid crystal device.
    Type: Grant
    Filed: June 22, 2009
    Date of Patent: October 15, 2013
    Assignee: LG Chem, Ltd.
    Inventors: Dae-Ho Kang, Min-Jin Ko, Jae-Ho Cheong, Bum-Gyu Choi, Myung-Sun Moon, Ki-Youl Lee, Yun-Bong Kim
  • Publication number: 20130187176
    Abstract: A silicone resin is provided. The silicone resin may be effectively used to encapsulate a semiconductor element, for example, a light-emitting element of a light-emitting diode.
    Type: Application
    Filed: July 23, 2012
    Publication date: July 25, 2013
    Applicant: LG CHEM, LTD.
    Inventors: Min Jin KO, Myung Sun MOON, Jae Ho JUNG, Bum Gyu CHOI, Dae Ho KANG, Min Kyoun KIM
  • Publication number: 20130009201
    Abstract: A curable composition is provided. A cured product showing excellent light extraction efficiency, crack resistance, hardness, thermal shock resistance and adhesive strength after a curing, as well as showing excellent processability and workability is provided. Also, surface stickiness may be prevented in the cured product without causing turbidity etc.
    Type: Application
    Filed: July 25, 2012
    Publication date: January 10, 2013
    Applicant: LG CHEM, LTD.
    Inventors: Min Jin KO, Myung Sun MOON, Jae Ho JUNG, Bum Gyu CHOI, Dae Ho KANG, Min Kyoun KIM
  • Publication number: 20130009200
    Abstract: The present invention relates to a curable composition. A curable composition may be provided; which shows excellent processability and workability; which shows excellent light extraction efficiency, crack resistance, hardness, thermal shock resistance and adhesive strength after curing; and which has excellent reliability and long-term reliability under high-temperature and/or high-moisture conditions. Also, turbidity and surface stickiness may be prevented in the cured product.
    Type: Application
    Filed: July 20, 2012
    Publication date: January 10, 2013
    Applicant: LG CHEM, LTD.
    Inventors: Min Jin KO, Myung Sun MOON, Jae Ho JUNG, Bum Gyu CHOI, Dae Ho KANG, Min Kyoun KIM
  • Patent number: 8339567
    Abstract: The present invention relates to a radial-shaped liquid crystal compound, and an optical film and a liquid crystal display device comprising the same. Particularly the present invention provides a compound represented by Chemical Formula 1 comprising a radial-shaped core of tetraphenyl ethylene in which four phenyl groups are bonded to an ethylene group, and makes it possible to provide an optical film which can minimize the change of color according to viewing angle and has an improved contrast ratio and high refractive anisotropy, and a liquid crystal display device comprising the same, by using the compound.
    Type: Grant
    Filed: July 3, 2009
    Date of Patent: December 25, 2012
    Assignee: LG Chem, Ltd.
    Inventors: Bum-Gyu Choi, Min-Jin Ko, Myung-Sun Moon, Jae-Ho Cheong, Dae-Ho Kang, Ki-Youl Lee, Yun-Bong Kim
  • Patent number: 8182716
    Abstract: Disclosed is a novel liquid crystal compound, a liquid crystal composition comprising the same, and an optical film using the same liquid crystal composition. More particularly, there is provided a liquid crystal material of a viewing angle compensation film with high quality characteristics, which can improve a contrast ratio and minimize variations in color with viewing angles in a black state, a liquid crystal composition comprising the same liquid crystal material, and a compensation film obtained from the same liquid crystal composition.
    Type: Grant
    Filed: January 22, 2008
    Date of Patent: May 22, 2012
    Assignee: LG Chem, Ltd.
    Inventors: Jae-Ho Cheong, Min-Jin Ko, Myung-Sun Moon, Bum-Gyu Choi, Dae-Ho Kang, Ki-Youl Lee, Yun-Bong Kim
  • Patent number: 8158023
    Abstract: Disclosed are a biaxial liquid crystal compound, a liquid crystal composition comprising the same, and an optical film using the same liquid crystal composition. More particularly, there is provided a liquid crystal material of a viewing angle compensation film with high quality characteristics, which can improve a contrast ratio and minimize variations in color with viewing angles in a black state, a liquid crystal composition comprising the same liquid crystal material, and a compensation film obtained from the same liquid crystal composition.
    Type: Grant
    Filed: January 22, 2008
    Date of Patent: April 17, 2012
    Assignee: LG Chem, Ltd.
    Inventors: Jae-Ho Cheong, Min-Jin Ko, Myung-Sun Moon, Bum-Gyu Choi, Dae-Ho Kang, Ki-Youl Lee, Yun-Bong Kim
  • Patent number: 8124199
    Abstract: Disclosed is a discotic liquid crystal compound, a liquid crystal composition comprising the same, and an optical film using the same liquid crystal composition. More particularly, there is provided a liquid crystal material of a viewing angle compensation film with high quality characteristics, which can improve a contrast ratio and minimize variations in color with viewing angles in a black state, a liquid crystal composition comprising the same liquid crystal material, and a compensation film obtained from the same liquid crystal composition.
    Type: Grant
    Filed: January 22, 2008
    Date of Patent: February 28, 2012
    Assignee: LG Chem, Ltd.
    Inventors: Jae-Ho Cheong, Min-Jin Ko, Myung-Sun Moon, Bum-Gyu Choi, Dae-Ho Kang, Ki-Youl Lee, Yun-Bong Kim
  • Patent number: 8052891
    Abstract: Disclosed are a novel fluorene derivative, a liquid crystal composition comprising the same, and an optical film using the same liquid crystal composition. More particularly, there are provided a liquid crystal material for a viewing angle compensation film with high quality characteristics, which can improve a contrast ratio measured at an oblique angle to the front and minimize variations in color with viewing angles in a black state, a liquid crystal composition comprising the same liquid crystal material, and a compensation film obtained from the same liquid crystal composition.
    Type: Grant
    Filed: January 22, 2008
    Date of Patent: November 8, 2011
    Assignee: LG Chem, Ltd.
    Inventors: Jae-Ho Cheong, Min-Jin Ko, Myung-Sun Moon, Bum-Gyu Choi, Dae-Ho Kang, Ki-Youl Lee, Yun-Bong Kim
  • Publication number: 20110187971
    Abstract: The present invention relates to a novel gelling agent comprising of a silane-amide chemical structure, a liquid crystal gel comprising the same and a liquid crystal device comprising said liquid crystal gel. The liquid crystal gel comprised of the novel gelling agent has excellent compatibility with other materials, and has excellent stability and solubility during manufacturing process of the same, and thus it can be applied to the production of a highly adaptable liquid crystal device.
    Type: Application
    Filed: June 22, 2009
    Publication date: August 4, 2011
    Applicant: LG CHEM, LTD.
    Inventors: Dae-Ho Kang, Min-Jin Ko, Jae-Ho Cheong, Bum-Gyu Choi, Myung-Sun Moon, Ki-Youl Lee, Yun-Bong Kim
  • Publication number: 20110181826
    Abstract: The present invention relates to a radial-shaped liquid crystal compound, and an optical film and a liquid crystal display device comprising the same. Particularly the present invention provides a compound represented by Chemical Formula 1 comprising a radial-shaped core of tetraphenyl ethylene in which four phenyl groups are bonded to an ethylene group, and makes it possible to provide an optical film which can minimize the change of color according to viewing angle and has an improved contrast ratio and high refractive anisotropy, and a liquid crystal display device comprising the same, by using the compound.
    Type: Application
    Filed: July 3, 2009
    Publication date: July 28, 2011
    Applicant: LG Chem, Ltd.
    Inventors: Bum-Gyu Choi, Min-Jin Ko, Myung-Sun Moon, Jae-Ho Cheong, Dae-Ho Kang, Ki-Youl Lee, Yun-Bong Kim
  • Patent number: 7968003
    Abstract: The present invention relates to a pyran derivative which manifests appropriate refractive anisotropy (optical anisotropy) and liquid crystal transition temperature and excellent dielectric anisotropy, and has excellent compatibility with various liquid crystal compounds, and thus, can be preferably used for the formation of a liquid crystal layer of a liquid crystal display device, its preparation method, a liquid crystal composition and liquid crystal display device comprising the same.
    Type: Grant
    Filed: September 9, 2009
    Date of Patent: June 28, 2011
    Assignee: LG Chem, Ltd.
    Inventors: Bum-Gyu Choi, Min-Jin Ko, Myung-Sun Moon, Jae-Ho Cheong, Dae-Ho Kang, Ki-Youl Lee, Yun-Bong Kim
  • Patent number: 7931946
    Abstract: Disclosed are a novel liquid crystal compound containing a sulfone group, a liquid crystal composition comprising the same, and an optical film using the same liquid crystal composition. More particularly, there are provided a liquid crystal material for a viewing angle compensation film with high quality characteristics, which can improve a contrast ratio measured at a tilt angle to the front and minimize variations in color with viewing angles in a black state, a liquid crystal composition comprising the same liquid crystal material, and a compensation film obtained from the same liquid crystal composition.
    Type: Grant
    Filed: January 22, 2008
    Date of Patent: April 26, 2011
    Assignee: LG Chem, Ltd.
    Inventors: Jae-Ho Cheong, Min-Jin Ko, Myung-Sun Moon, Bum-Gyu Choi, Dae-Ho Kang, Ki-Youl Lee, Yun-Bong Kim