Patents by Inventor Per E. Sjoberg

Per E. Sjoberg 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).

  • Device on a motor-driven vehicle to detect an obstacle in the way of the vehicle during backing
    Patent number: 4363376
    Abstract: A device on a vehicle to activate its brake system on the presence of an obstacle behind the vehicle during backing. Holders (7) project backwards from the vehicle with members (9, 10) for transmitting and receiving light. If the beam of light is interrupted, the vehicle is braked.In order to keep members (9, 10) free of dirt etc. air lines (5) directed towards them are connected to the quick-emptying valve (2) of the vehicle.
    Type: Grant
    Filed: January 15, 1981
    Date of Patent: December 14, 1982
    Inventors: Ake L. Sjoberg, Per E. Sjoberg, Frans B. Sjogren