Patents by Inventor Won Sug CHOI

Won Sug 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).

  • Method of manufacturing polyurethane filter foam
    Patent number: 11970566
    Abstract: Disclosed is a method of manufacturing a polyurethane filter foam having excellent air permeability, elasticity, and restoring force. In the method of manufacturing the polyurethane filter foam, the cell size of the filter foam is made regular by controlling the pressure by adjusting the diameter of the foaming head of a foaming machine, rather than adding a cell opener, cell irregularity caused by poor dispersion of the cell opener is alleviated, and air permeability, porosity, and compression set are excellent.
    Type: Grant
    Filed: September 30, 2022
    Date of Patent: April 30, 2024
    Assignees: HYUNDAI TRANSYS INC., CHIN YANG CO., LTD.
    Inventors: Jae Yong Ko, Seung Keon Woo, Young Tae Cho, Won Sug Choi, Sung Yoon Lee, Jae Kwang Lee, Jun Ho Song
  • METHOD OF MANUFACTURING POLYURETHANE FILTER FOAM
    Publication number: 20230106042
    Abstract: Disclosed is a method of manufacturing a polyurethane filter foam having excellent air permeability, elasticity, and restoring force. In the method of manufacturing the polyurethane filter foam, the cell size of the filter foam is made regular by controlling the pressure by adjusting the diameter of the foaming head of a foaming machine, rather than adding a cell opener, cell irregularity caused by poor dispersion of the cell opener is alleviated, and air permeability, porosity, and compression set are excellent.
    Type: Application
    Filed: September 30, 2022
    Publication date: April 6, 2023
    Inventors: Jae Yong KO, Seung Keon WOO, Young Tae CHO, Won Sug CHOI, Sung Yoon LEE, Jae Kwang LEE, Jun Ho SONG