Patents by Inventor David W. Sheldon

David W. 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).

  • Solar powered mailbox internal light
    Patent number: 5813749
    Abstract: This invention is an improvement of an internal lighting system for rural mailboxes. The improvement provides a maintenance-free mailbox internal lighting system by providing a solar cell charging system and rechargeable batteries to the circuitry. The internal light is automatically actuated by the opening of the door. All the components of the internal lighting system are undetectable to the casual observer to provide a degree of protection from vandalism or theft.
    Type: Grant
    Filed: December 20, 1996
    Date of Patent: September 29, 1998
    Inventor: David W. Sheldon
  • Rail launcher
    Patent number: 4423661
    Abstract: A rail launcher for a guided missile is shown to include a pair of movable sections, each actuable first to form a gap in an otherwise continuous rail for receiving a lug affixed to a guided missile and then to return to an initial position, capturing such lug and forming a track.
    Type: Grant
    Filed: February 1, 1982
    Date of Patent: January 3, 1984
    Assignee: Raytheon Company
    Inventor: David W. Sheldon