Patents by Inventor John Hamlin Roberts

John Hamlin Roberts 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).

  • External combustion engine
    Patent number: 7260934
    Abstract: An organic Rankine engine used to power a vehicle is provided with a quick-start system of pumps, electric heaters or pistons to generate a pressure differential across the motor, prior to the engine reaching operating conditions.
    Type: Grant
    Filed: April 5, 2006
    Date of Patent: August 28, 2007
    Inventor: John Hamlin Roberts