Patents by Inventor Jouko Karhunen

Jouko Karhunen 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 and equipment for attenuation of oscillation in a paper machine or in a paper finishing device
    Patent number: 6911117
    Abstract: A method and apparatus for damping vibration in a paper machine. The apparatus having a dynamic damper which includes a weight suspended by a spring. The spring constant of the spring is changed by means of a control device in order to tune the natural frequency of the dynamic damper. The dynamic damper is tuned to a frequency that is substantially equal to a multiple of the rotational frequency of the roll in the paper machine that is being damped.
    Type: Grant
    Filed: April 22, 1998
    Date of Patent: June 28, 2005
    Assignee: Metso Paper, Inc.
    Inventors: Jouko Karhunen, Arto Puranen, Jorma Köliö, Esa Lehtovirta, Erkki Hietamäki