Patents Assigned to Roby's Enterprises, Inc.
  • Adhesive composition
    Patent number: 4045395
    Abstract: A water impervious surfacing composition which includes cement and sand and a mixture of an aqueous coal tar emulsion and an aqueous polyvinyl acetate emulsion.
    Type: Grant
    Filed: March 1, 1976
    Date of Patent: August 30, 1977
    Assignee: Roby's Enterprises, Inc.
    Inventor: Ray I. Roby