Patents by Inventor Donald Charles Sheldon

Donald Charles Sheldon 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).

  • Power supply employing a short circuit detector
    Patent number: 4040116
    Abstract: A short circuit detector is provided for a compact power supply system in which a plurality of power supplies may be operated in parallel. The detector senses when a voltage drop in a bus indicates a possible short and then energizes solid state devices to turn the system off for a prescribed period of time. After the prescribed period of time has passed, the system will attempt to restart. If the ground has been cleared, system operation will be restored. If not, the system will again be shut down for the prescribed period.
    Type: Grant
    Filed: December 4, 1975
    Date of Patent: August 2, 1977
    Assignee: International Telephone and Telegraph Corporation
    Inventor: Donald Charles Sheldon