Patents Assigned to Kabushiki Kaisha Alps Slate
  • Slate and method of manufacturing therefor
    Patent number: 4864793
    Abstract: A slate and the method of manufacturing therefor comprising substantially a single color mortar cement. The outer surface of the slate has at least two different shapes which produce a different color variation to one another.
    Type: Grant
    Filed: March 18, 1987
    Date of Patent: September 12, 1989
    Assignee: Kabushiki Kaisha Alps Slate
    Inventor: Hiroshi Miyazaki