Patents by Inventor Won Jun Chey

Won Jun Chey 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).

  • Process of making polypropylene fibers
    Patent number: 6669888
    Abstract: Process of making polypropylene fibers obtained from an isotactic polypropylene homopolymer with an isotactic index of 90-99%, through melt-spinning or through drawing after melt-spinning, and shows two differential scanning calorimeter (DSC) endothermic peaks between 155 and 170 ° C. When being thermally bonded with each other, the fibers are made into non-woven fabrics which have excellent strength in addition to being soft. A high quality of the non-woven fabrics can be produced in a high speed carding machine with high yields.
    Type: Grant
    Filed: May 29, 2001
    Date of Patent: December 30, 2003
    Inventors: Pyung Yul Park, Won Jun Chey
  • Polypropylene fiber and preparation thereof
    Publication number: 20010031814
    Abstract: Disclosed is a polypropylene fiber, which is obtained from an isotactic polypropylene homopolymer with an isotactic index of 90 to 99% through melt-spinning or through drawing after melt-spinning, and shows two differential scanning colorimeter (DSC) endothermic peaks between 155 and 170° C. When being thermally bonded with one another, the fibers are made into non-woven fabrics which have excellent strength in addition to being soft. A high quality of the non-woven fabrics can be produced in high speed carding machines with high yields.
    Type: Application
    Filed: May 29, 2001
    Publication date: October 18, 2001
    Applicant: Pyung Yul Park
    Inventors: Pyung Yul Park, Won Jun Chey
  • Polypropylene fiber and preparation thereof
    Patent number: 6270892
    Abstract: Disclosed is a polypropylene fiber, which is obtained from an isotactic polypropylene homopolymer with an isotactic index of 90 to 99% through melt-spinning or through drawing after melt-spinning, and shows two differential scanning calorimeter (DSC) endothermic peaks between 155 and 170° C. When being thermally bonded with one another, the fibers are made into non-woven fabrics which have excellent strength in addition to being soft. A high quality of the non-woven fabrics can be produced in high speed carding machines with high yields.
    Type: Grant
    Filed: June 23, 2000
    Date of Patent: August 7, 2001
    Assignee: Pyung Yul Park
    Inventors: Pyung Yul Park, Won Jun Chey