Patents by Inventor William H. Foster

William H. Foster 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).

  • Electrical tap switch
    Patent number: 4875152
    Abstract: An electrical tap switch is provided that allows a user to control two power outlets. In one embodiment the tap switch is used in-line between one extension cord and two additional ones. In another embodiment the tap switch is plugged directly into a wall receptacle and is permanently secured using a screw mechanism. An indicator is used to display the on-off status of the tap switch. A bar graph current indicator is provided that displays the total current drawn by all loads.
    Type: Grant
    Filed: March 16, 1988
    Date of Patent: October 17, 1989
    Inventor: William H. Foster