Patents by Inventor Adrianus Antonius Wilhelmus de Ruiter

Adrianus Antonius Wilhelmus de Ruiter 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).

  • Shock absorber with frequency-dependent damping
    Patent number: 7395907
    Abstract: Shock absorber containing a flow channel (16), provided with a valve assembly, made in the piston section. This valve assembly is designed to be actuated hydraulically. To this end there is an auxiliary chamber (22, 42) which on one side is eliminated by a movable valve body (18). This valve body is provided with an inlet for oil from the flow channel to the auxiliary chamber. There is an outlet (21, 41) (that can be closed off). The surface area of the valve body acting on the valve seat (19) is less than the surface area of the valve body in the auxiliary chamber, so that fluid flowing through the inlet of the valve body results in an increase in the volume of the auxiliary chamber and thus in closing movement of the valve body. Because filing of the auxiliary chamber takes some time, a frequenncy-dependend closing characteristic of the flow channel is obtained.
    Type: Grant
    Filed: November 6, 2002
    Date of Patent: July 8, 2008
    Assignee: Koni B.V.
    Inventors: Paul de Kock, Adrianus Antonius Wilhelmus de Ruiter