Patents by Inventor Erkki Hietamäki

Erkki Hietamäki 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).

  • Dewatering arrangement on the press section of a web-forming machine
    Patent number: 7678234
    Abstract: A dewatering arrangement in the press section of a web-forming machine having a press suction roll (10) and a press fabric (13) arranged to run via the press suction roll (10). The dewatering arrangement has a saveall (15), which is installed in conjunction with the press suction roll (10), and drainage facilities (18) for removing the collected water from the saveall (15). The saveall (15) has a concave guide surface (19) which in the cross direction is located on a partial distance of the circumference of the press suction roll (10) and at a distance from the surface of the press suction roll (10) in order to accomplish a vacuum effect and to hence remove water from the press suction roll (10).
    Type: Grant
    Filed: October 18, 2006
    Date of Patent: March 16, 2010
    Assignee: Metso Paper, Inc.
    Inventors: Risto Haiko, Erkki Hietamäki, Mikko Kauppinen, Reijo Koivuranta, Kauno Kujala, Pekka Petrilä, Timo Pirinen, Esa Rajala, Markku Salo, Sampo Vörgren
  • 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