Patents by Inventor Edwin J. Matys

Edwin J. Matys has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Locking device for the prongs of an electrical plug
    Patent number: 4025140
    Abstract: In one embodiment a protective housing adapted to be locked upon and cover a prong of an electrical plug is disclosed. The housing has a chamber to receive a prong of the plug and has a collared recess and threaded bore on one side communicating with the chamber to receive a lock screw that impinges upon the prongs. The head of the lock screw is guidably received in the collared recess and has a side slot. A key is provided with a tab at one end that engages the slot and the collared recess allows the key to turn the lock screw to and from its locked position against the prong.
    Type: Grant
    Filed: November 28, 1975
    Date of Patent: May 24, 1977
    Assignee: Tula Machine Co., Inc.
    Inventor: Edwin J. Matys