Patents by Inventor Chang Woo Joo

Chang Woo Joo 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).

  • Light-emitting element ink, display device, and method of fabricating the display device
    Patent number: 11935876
    Abstract: A light-emitting element ink, a display device, and a method of fabricating the display device are provided. The light-emitting element ink includes a light-emitting element solvent, light-emitting elements dispersed in the light-emitting element solvent, each of the light-emitting elements including a plurality of semiconductor layers and an insulating film that surrounds parts of outer surfaces of the semiconductor layers, and a surfactant dispersed in the light-emitting element solvent, the surfactant including a fluorine-based and/or a silicon-based surfactant.
    Type: Grant
    Filed: April 27, 2021
    Date of Patent: March 19, 2024
    Assignee: Samsung Display Co., Ltd.
    Inventors: Jun Bo Sim, Duk Ki Kim, Yong Hwi Kim, Hyo Jin Ko, Chang Hee Lee, Chan Woo Joo, Jae Kook Ha, Na Mi Hong
  • Method for preparing stabilized hydrocarbon oil blend
    Patent number: 9624448
    Abstract: Disclosed herein are a method of preparing a hydrocarbon oil blend having superior storage stability using a novel stability prediction model that is quick, easy and reliable; and a method of predicting the stability of a hydrocarbon blend.
    Type: Grant
    Filed: April 16, 2013
    Date of Patent: April 18, 2017
    Assignees: SK INNOVATION CO., LTD., SK ENERGY CO., LTD.
    Inventors: Chang Woo Joo, Yun Hee Lee, Ki Seok Choi, Gwang Hyoun Kim, Young Suk Kim, Myoung Han No, Dong Wook Park, Eun Kyoung Kim
  • Recycling Method of Sludge Recovery Oil
    Publication number: 20150353846
    Abstract: Provided is a recycling method of recovery oil including: a) recovering sludge accumulated in a crude oil tank; b) separating the sludge into recovery oil, water, and sediment; and c) mixing the recovery oil with crude oil and performing fractional distillation on a mixture of the recovery oil and the crude oil.
    Type: Application
    Filed: June 9, 2015
    Publication date: December 10, 2015
    Inventors: Chang Woo Joo, Soojung Park, Kwan Bum Lee, Min Seob Lee, Ki Seok Choi, Sung Ho Lee, Yong Jae Lee
  • Method for reducing the amount of organic acids in a hydrocarbon oil fraction
    Patent number: 9127215
    Abstract: Provided is a method for reducing the amount of organic acids in a hydrocarbon oil fraction by hydrogenating the organic acids in the hydrocarbon oil fraction under mild conditions. Provided is a new method able to overcome the problem of organic-acid-induced corrosion during the process of distillation, by using hydrogen or a hydrogen-containing mixed gas and a hydrogenation catalyst to subject the organic acids in the hydrocarbon oil fraction to hydrogenation at an appropriate temperature and pressure, thereby converting the same to hydrocarbons and so reducing the amount of organic acids in the hydrocarbon oil fraction.
    Type: Grant
    Filed: January 4, 2012
    Date of Patent: September 8, 2015
    Assignees: SK INNOVATION CO., LTD., SK ENERGY CO., LTD.
    Inventors: Jin Kyu Choi, Cheol Woo Park, Tae Won Uhm, Il Yong Jeong, Ha Na Song, Do Woan Kim, Hee Jung Jeon, Gyung Rok Kim, Cheol Joong Kim, Do Hyoun Kim, Chang Woo Joo
  • METHOD FOR PREPARING STABILIZED HYDROCARBON OIL BLEND
    Publication number: 20150090631
    Abstract: Disclosed herein are a method of preparing a hydrocarbon oil blend having superior storage stability using a novel stability prediction model that is quick, easy and reliable; and a method of predicting the stability of a hydrocarbon blend.
    Type: Application
    Filed: April 16, 2013
    Publication date: April 2, 2015
    Inventors: Chang Woo Joo, Yun Hee Lee, Ki Seok Choi, Gwang Hyoun Kim, Young Suk Kim, Myoung Han No, Dong Wook Park, Eun Kyoung Kim
  • Method for Reducing the Amount of Organic Acids in a Hydrocarbon Oil Fraction
    Publication number: 20130289328
    Abstract: Provided is a method for reducing the amount of organic acids in a hydrocarbon oil fraction by hydrogenating the organic acids in the hydrocarbon oil fraction under mild conditions. Provided is a new method able to overcome the problem of organic-acid-induced corrosion during the process of distillation, by using hydrogen or a hydrogen-containing mixed gas and a hydrogenation catalyst to subject the organic acids in the hydrocarbon oil fraction to hydrogenation at an appropriate temperature and pressure, thereby converting the same to hydrocarbons and so reducing the amount of organic acids in the hydrocarbon oil fraction.
    Type: Application
    Filed: January 4, 2012
    Publication date: October 31, 2013
    Applicants: SK ENERGY CO., LTD., SK INNOVATION CO., LTD
    Inventors: Jin Kyu Choi, Cheol Woo Park, Tae Won Uhm, II Yong Jeong, Ha Na Song, Do Woan Kim, Hee Jung Jeon, Gyung Rok Kim, Cheol Joong Kim, Do Hyoun Kim, Chang Woo Joo