Patents by Inventor Karl Sipi

Karl Sipi 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 of calendering a paper web
    Patent number: 5156086
    Abstract: The invention concerns a method in calendering, wherein one or several pairs of rolls are employed through which the web to be calendered runs. One roll in each pair of rolls is a hard roll which is a heated metal roll, and the other roll in each pair of rolls is a roll provided with a resilient coating. In the method, the face of the roll with a resilient coating is also heated to a high temperature, advantageously to the same temperature as the heated metal roll. The invention also concerns a roll used in the method as well as the use of the method and of the roll.
    Type: Grant
    Filed: August 21, 1991
    Date of Patent: October 20, 1992
    Assignee: Valmet Paper Machinery Inc.
    Inventors: Timo Kiema, Karl Sipi, Timo Viitanen