Patents by Inventor Alan L. Sheldon

Alan L. 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).

  • Apparatus for detecting a completed electrical circuit at an electrical output receptacle
    Patent number: 5331283
    Abstract: An electrical test buzzer is adapted for insertion into an output receptacle and used to test for the presence of electricity at the output receptacle. The electrical test buzzer includes an audible alarm, a transformer, held in a housing, and a pair of contact prongs. The contact prongs are inserted into a respective output receptacle causing the buzzer to sound a high pitched alarm when electricity is present at the receptacle. When no electricity is present at the receptacle no circuit is formed and the alarm does not sound.
    Type: Grant
    Filed: November 23, 1992
    Date of Patent: July 19, 1994
    Inventor: Alan L. Sheldon