Patents by Inventor Göran Hellén

Göran Hellén 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).

  • Method of reducing nitrogen oxide (NOx) emissions of piston engine
    Patent number: 6415745
    Abstract: A method of reducing nitrogen oxide (NOx) emissions of a four-stroke turbo-charged piston engine by injecting water or steam into the combustion chamber of the engine, wherein the water injection is carried out at least substantially during the intake stroke of the engine. The injecting of water is initiated at the earliest when the inlet valve has moved through about 50% of the total range of its opening movement.
    Type: Grant
    Filed: July 21, 2000
    Date of Patent: July 9, 2002
    Assignee: Wartsila Nsd Oy AB
    Inventors: Göran Hellén, Seppo Tiensuu, Juha Kytölä, Tapani Humalamaa