Patents Examined by Petricia L. Nordmeyer
  • Floor covering based on perforated PVC sheet
    Patent number: 6887555
    Abstract: Disclosed is a floor covering, in which a surface material such as wood, Korean paper, textile fabric, and thermosetting resin sheet is attached to a surface of a perforated high density PVC sheet. Shrinkage or expansion differences between the surface material and the PVC sheet are removed because multiple holes of the perforated high density PVC sheet offset shrinkage or expansion of the PVC sheet, thereby cracks or curling of the floor covering are prevented and the floor covering can have a smooth appearance.
    Type: Grant
    Filed: February 22, 2002
    Date of Patent: May 3, 2005
    Assignees: Woojin Corporation
    Inventors: Je-Suk Woo, Hyeong-Keor Yoo