Patents by Inventor Ji Soo HEO

Ji Soo HEO 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).

  • Charging roller for image forming
    Patent number: 10816911
    Abstract: A charging roller for an image forming apparatus is provided, which includes a shaft, an elastic layer disposed around the shaft, and a coating layer formed on the elastic layer, wherein the coating layer includes a urethane resin formed by crosslinking of a polyol mixture with polyisocyanate, and the polyol mixture includes polyester polyol and polyether polyol having 60% by weight or more and 90% by weight or less of an ethylene oxide content.
    Type: Grant
    Filed: May 24, 2018
    Date of Patent: October 27, 2020
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Young Phil Ji, Norihiro Harada, Ji Soo Heo
  • CHARGING ROLLER FOR IMAGE FORMING
    Publication number: 20200257216
    Abstract: A charging roller for an image forming apparatus is provided, which includes a shaft, an elastic layer disposed around the shaft, and a coating layer formed on the elastic layer, wherein the coating layer includes a urethane resin formed by crosslinking of a polyol mixture with polyisocyanate, and the polyol mixture includes polyester polyol and polyether polyol having 60% by weight or more and 90% by weight or less of an ethylene oxide content.
    Type: Application
    Filed: May 24, 2018
    Publication date: August 13, 2020
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Young Phil JI, Norihiro HARADA, Ji Soo HEO