Patents Assigned to William J. Roy
  • Electric plug locking device
    Patent number: 5393237
    Abstract: An electric plug locking device (10), which remains affixed to an electric plug (13) for preventing unsupervised use of electrical equipment, has an upper housing member (11) movably mounted to a lower housing member (12). The upper housing member which has an opening (23) for receiving a plug terminal (15) moves from a position that shields the terminal to prevent it from being inserted into an electrical socket to a position that unshields the plug terminal to permit it to be inserted into the socket.
    Type: Grant
    Filed: September 22, 1993
    Date of Patent: February 28, 1995
    Assignee: William J. Roy
    Inventors: William J. Roy, Michael C. Mayne