Patents by Inventor Shirley J. Warren

Shirley J. Warren 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).

  • Safety plug with prong locks
    Patent number: 5085591
    Abstract: An electrical plug for the end of an electrical power cord. The plug includes prongs which are movable between retracted and extended positions. The prongs can be locked in the retracted and extended positions, as desired. When the prongs are locked in the retracted position, small children are prevented from attempting to connect the power cord to an electrical outlet.
    Type: Grant
    Filed: November 5, 1990
    Date of Patent: February 4, 1992
    Inventors: Charles C. Warren, Sr., Shirley J. Warren
  • Safety plug with ground lock and prong locks
    Patent number: 5082450
    Abstract: An electrical plug for the end of an electrical power cord. The plug includes plug prongs and a ground prong, all of which are moveable between retracted and extended positions. The prongs can be locked in the retracted and extended positions, as desired. When the prongs are locked in the retracted position, small children are prevented from attempting to connect the power cord to an electrical outlet. The plug can also be locked in an electrical outlet.
    Type: Grant
    Filed: November 5, 1990
    Date of Patent: January 21, 1992
    Inventors: Charles C. Warren, Sr., Shirley J. Warren