Patents by Inventor Markku Kuivalainen

Markku Kuivalainen 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).

  • Door closer
    Patent number: 4185356
    Abstract: A door closer is connected to a door. The movements of the door cause a piston member in the door closer to pump a pressure medium through a flow duct. There is also a flow limiting member influencing at least the speed of the opening movement of the door, and this flow limiting member cooperates with an adjustable activating element which, at a desired opening moment mechanically sets the elements of the flow limiting member in a position considerably increasing the flow resistance of the pressure medium. This brakes the movement of the piston member, and thus, also the movement of the door.
    Type: Grant
    Filed: December 5, 1977
    Date of Patent: January 29, 1980
    Assignee: Oy Wartsila Ab
    Inventors: Markku Kuivalainen, Hannu Pehkonen