Patents by Inventor Ragnar Karl Olof Gronvall

Ragnar Karl Olof Gronvall 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).

  • Hot gas engine
    Patent number: 3942324
    Abstract: A hot gas engine including an injector for introducing a mixture of air and fuel into the combustion chamber to heat the working medium which is circulated in a system of ducts. Fresh air for the combustion of the fuel is preheated in a heat exchanger by exhaust gases from the combustion chamber and conducted to the fuel injector. A heating system for passing a heat exchange fluid to a space to be heated surrounds the combustion chamber, and the heat exchange fluid is thus heated by heat exchange with the exhaust gases.
    Type: Grant
    Filed: July 12, 1974
    Date of Patent: March 9, 1976
    Assignee: Forenade Fabriksverken
    Inventors: Lennart Nils Johansson, Ragnar Karl Olof Gronvall