Patents by Inventor Pentti S. Lehtonen

Pentti S. Lehtonen 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 for coating a roll and a coated roll for a paper machine
    Patent number: 5582568
    Abstract: A coated roll and a method for coating a roll used in a paper machine. Desired surface property values of the roll are fed into a central unit of the coating system and the roll is coated while following a function f.sub.1 (x),f.sub.3 (x) created in the central unit over the distance of the length of the roll. A surface hardness and/or surface profile corresponding to the formed function f.sub.1 (x),f.sub.2 (x) is derived which does not have any steps or other points of discontinuity. The roll is coated with a polymer, preferably polyurethane.
    Type: Grant
    Filed: January 5, 1995
    Date of Patent: December 10, 1996
    Assignee: Valmet Corporation
    Inventor: Pentti S. Lehtonen
  • Method for coating a roll
    Patent number: 5412870
    Abstract: A coated roll and a method for coating a roll used in a paper machine. Desired surface property values of the roll are fed into a central unit of the coating system and the roll is coated while following a function f.sub.1 (x),f.sub.3 (x) created in the central unit over the distance of the length of the roll. A surface hardness and/or surface profile corresponding to the formed function f.sub.1 (x),f.sub.2 (x) is derived which does not have any steps or other points of discontinuity. The roll is coated with a polymer, preferably polyurethane.
    Type: Grant
    Filed: February 14, 1994
    Date of Patent: May 9, 1995
    Assignee: Valmet Paper Machinery, Inc.
    Inventor: Pentti S. Lehtonen