Patents by Inventor James P. Purdy

James P. Purdy 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 apparatus to connect towing vehicle light circuits to a trailer light circuit when the towing vehicle has separate circuits respectively for turning and stop lights and the trailer has a common light circuit for both turning and stop lights
    Patent number: 3970860
    Abstract: The adapter circuit is interposed between the towing vehicle light circuit including at least a right turn light circuit, a brake light circuit, a left turn light circuit, and a light system common and the trailer light circuit including at least a left signal lamp and a right signal lamp. A right turn relay, operating a single normally closed contact, is connected to and responds to energization of the right turn light circuit. A brake relay, operating two normally closed contacts, is connected to and responds to energization of the brake light circuit. A left turn relay, operating a single normally closed contact, is connected to and responds to energization of the left turn light circuit. The right signal lamp is connected on one side to the light system common and on the other side through the first of the brake relay operated contacts to the right turn light circuit. The latter side is also connected through the right turn relay operated contact to the brake light circuit.
    Type: Grant
    Filed: August 23, 1974
    Date of Patent: July 20, 1976
    Inventor: James P. Purdy