Patents by Inventor Erkki O. Seppanen

Erkki O. Seppanen 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 apparatus for forming paper
    Patent number: 4306934
    Abstract: The wet end of a fourdrinier paper machine includes a transversely disposed roll beneath the wire. The roll is shaped and mounted for rotation at a speed which is different from the speed of the wire to create pulses of negative pressure beneath the wire for drawing liquid from the web of fibers formed thereon. Also disclosed is a fin apparatus transversely disposed beneath the wire to create a wave of positive pressure thereunder to urge the formed web off of the wire.
    Type: Grant
    Filed: January 24, 1980
    Date of Patent: December 22, 1981
    Inventor: Erkki O. Seppanen
  • Forming paper using a curved fin to facilitate web transfer
    Patent number: 4243482
    Abstract: A fin apparatus is transversely disposed beneath a wire to create a wave of positive pressure thereunder to urge a formed web off of the wire. The fin surface, in transverse cross-section, is a smooth convex curve that diminishes in radius toward the downstream end of the fin.
    Type: Grant
    Filed: November 27, 1978
    Date of Patent: January 6, 1981
    Inventor: Erkki O. Seppanen