Patents by Inventor Ragnar Ekwall

Ragnar Ekwall 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).

  • Drive unit for boats
    Patent number: 5735718
    Abstract: A drive unit for a boat having an engine with a flywheel surrounded by a flywheel casing, a propeller drive housing connected to, but electrically insulated from, the flywheel casing, and an input shaft for the propeller drive housing which is driven and electrically insulated from the flywheel.
    Type: Grant
    Filed: May 29, 1996
    Date of Patent: April 7, 1998
    Assignee: AB Volvo Penta
    Inventor: Ragnar Ekwall