Patents by Inventor Sang Ja Choi

Sang Ja 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).

  • Organic electroluminescent compound and organic electroluminescent device comprising the same
    Patent number: 11963439
    Abstract: The present disclosure relates to an organic electroluminescent compound and an organic electroluminescent device comprising the same. By comprising the compound according to the present disclosure, it is possible to produce an organic electroluminescent device having improved driving voltage, power efficiency, and/or lifetime properties compared to the conventional organic electroluminescent devices.
    Type: Grant
    Filed: August 24, 2022
    Date of Patent: April 16, 2024
    Assignee: Rohm and Haas Electronic Materials Korea Ltd.
    Inventors: Eun-Joung Choi, Young-Kwang Kim, Su-Hyun Lee, So-Young Jung, YeJin Jeon, Hong-Se Oh, Dong-Hyung Lee, Jin-Man Kim, Hyun-Woo Kang, Mi-Ja Lee, Hee-Ryong Kang, Hyo-Nim Shin, Jeong-Hwan Jeon, Sang-Hee Cho
  • Hair Conditioning Composition Comprising Quaternized Silicone Polymer, Silicone Copolymer, and Carbamate
    Publication number: 20110135588
    Abstract: Disclosed is a hair conditioning composition comprising by weight: (a) from about 0.1% to about 15% of a silicone polymer containing quaternary groups wherein said silicone polymer comprises silicone blocks with greater than about 200 siloxane units; (b) a solvent for the silicone polymer which is a silicone copolyol, at a level such that the weight % of the silicone copolyol in its mixture with the quaternized silicone polymer is in the range of from about 1% to about 50%; (c) from about 0.001% to about 0.1% of a carbamate preservative; (d) an aqueous carrier.
    Type: Application
    Filed: December 7, 2010
    Publication date: June 9, 2011
    Inventors: Nobuaki UEHARA, Sang Ja Choi