Patents by Inventor Si Ju Ryu

Si Ju Ryu 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).

  • Porous membrane and method for manufacturing the same
    Patent number: 9293750
    Abstract: A porous membrane contains a polyethylene resin, in a core layer, pores of sizes that are relatively larger than those of pores in each of skin layers on the opposite sides are distributed, and the skin layers on the opposite sides have substantially same pore characteristics. A method for manufacturing a porous membrane includes the steps of: obtaining a mixture of a liquid-type paraffin oil and a solid-type paraffin wax; adding the mixture to a polyethylene resin to obtain a raw material resin mixture; extruding and cooling the raw material resin mixture; stretching the raw material resin mixture; and immersing the stretched raw material resin mixture in an organic solvent to extract a mixture of the oil and the wax.
    Type: Grant
    Filed: October 5, 2012
    Date of Patent: March 22, 2016
    Assignee: W-Scope Corporation
    Inventors: Jae Won Yang, Si Ju Ryu, Seong Tae Kim, Byung Hyunn Kim, Jung Goo Park, Hee Min Cho
  • POROUS MEMBRANE AND METHOD FOR MANUFACTURING THE SAME
    Publication number: 20130171499
    Abstract: A porous membrane contains a polyethylene resin, in a core layer, pores of sizes that are relatively larger than those of pores in each of skin layers on the opposite sides are distributed, and the skin layers on the opposite sides have substantially same pore characteristics. A method for manufacturing a porous membrane includes the steps of: obtaining a mixture of a liquid-type paraffin oil and a solid-type paraffin wax; adding the mixture to a polyethylene resin to obtain a raw material resin mixture; extruding and cooling the raw material resin mixture; stretching the raw material resin mixture; and immersing the stretched raw material resin mixture in an organic solvent to extract a mixture of the oil and the wax.
    Type: Application
    Filed: October 5, 2012
    Publication date: July 4, 2013
    Inventors: Jae Won Yang, Si Ju Ryu, Seong Tae Kim, Byung Hyunn Kim, Jung Goo Park, Hee Min Cho