Patents by Inventor Joo-Hoon CHOI

Joo-Hoon 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 light emitting diode
    Patent number: 11980093
    Abstract: An organic light emitting device including a compound of Chemical Formula 1 and a compound of Chemical Formula 2, wherein
    Type: Grant
    Filed: May 17, 2019
    Date of Patent: May 7, 2024
    Assignee: LG Chem, Ltd.
    Inventors: Woochul Lee, Ji Young Choi, Joo Ho Kim, Dong Hoon Lee, Sang Duk Suh, Hoon Jun Kim
  • Vacuum adsorption apparatus and a vacuum adsorption method of semiconductor package
    Patent number: 9795918
    Abstract: Provided is a vacuum adsorption apparatus and a method of adsorbing a semiconductor package in a vacuum state. The vacuum adsorption apparatus includes a housing having an opening formed on its top surface, a vacuum adsorption unit disposed in the housing, and a stage formed on the opening formed in the housing and including a plurality of holes. A pressure generated from the vacuum adsorption unit is applied to the top surface of the stage through the opening and the plurality of holes.
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: October 24, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Yong-Ki Kim, Joo-Hoon Choi
  • VACUUM ADSORPTION APPARATUS AND A VACUUM ADSORPTION METHOD OF SEMICONDUCTOR PACKAGE
    Publication number: 20150311059
    Abstract: Provided is a vacuum adsorption apparatus and a method of adsorbing a semiconductor package in a vacuum state. The vacuum adsorption apparatus includes a housing having an opening formed on its top surface, a vacuum adsorption unit disposed in the housing, and a stage formed on the opening formed in the housing and including a plurality of holes. A pressure generated from the vacuum adsorption unit is applied to the top surface of the stage through the opening and the plurality of holes.
    Type: Application
    Filed: March 12, 2015
    Publication date: October 29, 2015
    Inventors: Yong-Ki KIM, Joo-Hoon CHOI