Patents by Inventor Martti Rimppi

Martti Rimppi 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 for reducing propeller noise
    Patent number: 4135469
    Abstract: A method and a device for blowing gaseous medium between the propeller and the hull of a ship the vibration and noise caused in the ship by its driving propeller is considerably reduced. In order to optimize the application of this noise reducing method the total flow Q of the gaseous medium blown out should, expressed in normal cubic meters per hour, satisfy a special formula.
    Type: Grant
    Filed: March 24, 1977
    Date of Patent: January 23, 1979
    Assignee: Oy Wartsila AB
    Inventors: Martti Rimppi, Olavi Turunen