Patents by Inventor Chi S. Lee

Chi S. 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 forming a sheet material permeable to gas and not permeable to water
    Patent number: 5356497
    Abstract: A method for forming a sheet material permeable to gas and not permeable to water includes forming the sheet material by hot pressing two materials together, and discharging static electricity to the sheet material in order to form a number of apertures in the sheet material. The apertures have a size smaller than that of water particles and larger than that of gas particles such that the sheet material is permeable to gas and not permeable to water.
    Type: Grant
    Filed: May 5, 1993
    Date of Patent: October 18, 1994
    Inventor: Chi S. Lee