Patents by Inventor Gyeongshin Lee

Gyeongshin Lee 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).

  • METHOD FOR PREPARING POLYPHENYLENE OXIDE
    Publication number: 20240117116
    Abstract: A method for preparing polyphenylene oxide, the method capable of reducing energy cost by eliminating the need for a separate process of separating and purifying ortho-cresol which is produced after an alkylation reaction of phenol, and preparing polyphenylene oxide with excellent processability in excellent yields under mild oxidative coupling reaction conditions, is provided.
    Type: Application
    Filed: June 30, 2022
    Publication date: April 11, 2024
    Inventors: Gyeongshin Choi, Jihyun Choi, Chunhwa Lee
  • Cup holder tray for sofa
    Patent number: D942217
    Type: Grant
    Filed: September 2, 2020
    Date of Patent: February 1, 2022
    Inventor: Gyeongshin Lee