Patents Assigned to Ferjon
  • Lightweight gypsum products and methods of making same
    Patent number: 4238546
    Abstract: Disclosed is a method of making lightweight gypsum products wherein expanded substantially monocellular volcanic ash having a loose bulk density of about 0.05 to about 15 pounds per cubic foot is added to calcined gypsum and water to form a slurry. The hydrated gypsum product formed has a bulk density of about 24 to about 45 pounds per cubic foot.
    Type: Grant
    Filed: July 30, 1979
    Date of Patent: December 9, 1980
    Assignee: Ferjon
    Inventor: Harold L. Phillips