Patents Assigned to P.P.M.D.
  • Drive fastener
    Patent number: 4533288
    Abstract: A drive fastener designed to be hammered into penetrable material. One end of the drive fastener is split. The opposite end of the drive fastener contains threads. A pair of nuts are threaded together on the threaded end of the drive fastener to receive the impact of a hammering device for driving the fastener into penetrable material. When being driven, the split end spreads while penetrating to secure the fastener in place. The nuts are then removed and a single nut may be used to secure an object to the set fastener.
    Type: Grant
    Filed: July 29, 1982
    Date of Patent: August 6, 1985
    Assignee: P.P.M.D.
    Inventors: Bernard W. Rivkin, Michael R. Monfort
  • Hanger
    Patent number: D278576
    Type: Grant
    Filed: March 26, 1982
    Date of Patent: April 30, 1985
    Assignee: P.P.M.D.
    Inventors: Bernard W. Rivkin, Charles R. Leaf