Patents Assigned to P.P.M.D.
  • Patent number: 4632397
    Abstract: A transparent container partially filled with transparent viscous liquid; contains a multifaceted multicolored indicia enhanced game piece, which is greater in specific gravity than the transparent viscous liquid and an air bubble greater in size than the maximum horizontal clearance distance between the game piece and container side wall. When the container is turned relatively end for end the bubble rises, striking the game piece, whereby it rotates as it falls slowly to the bottom of the container, where the top or scoring facet of the game piece is viewed through the transparent container and transparent liquid. The game piece falling time period, being relatively repetitive, may be used for game play timing. The colors and indicia on the game piece facets give the player game playing instructions.
    Type: Grant
    Filed: February 1, 1985
    Date of Patent: December 30, 1986
    Assignee: P.P.M.D. Inc.
    Inventor: Bernard W. Rivkin
  • 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
  • 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