Patents by Inventor Ake Ringqvist

Ake Ringqvist 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 a device for drying or heat treatment of a web-formed material
    Patent number: 7401417
    Abstract: When drying a web-formed material, the web-formed material is passed, in contact with a gas-permeable dryer screen, through a drying plant. One or more fans blow hot process air against, and through, the web-formed material in order to dry it. A chamber, surrounding the fan or the fans, has a limiting surface that is essentially parallel to the surface of the web-formed material. This limiting surface has an opening that extends essentially across the whole width of the web-formed material. A distributing member, in the form of an arcuate perforated, sheet-formed element, placed outside the chamber, covers the opening completely. With the distributing member a first flow of process air is divided into a large number of jets, distributed over essentially the whole of the angular area that faces the web-formed material.
    Type: Grant
    Filed: December 16, 2003
    Date of Patent: July 22, 2008
    Assignee: Andritz Fiber Drying Aktiebolag
    Inventors: Ingemar Rydell, Ake Ringqvist, Heikki Salo
  • Method and a device for drying or heat treatment of a web-formed material
    Publication number: 20060150434
    Abstract: When drying a web-formed material, the web-formed material is passed, in contact with a gas-permeable dryer screen, through a drying plant. One or more fans blow hot process air against, and through, the web-formed material in order to dry it. A chamber, surrounding the fan or the fans, has a limiting surface that is essentially parallel to the surface of the web-formed material. This limiting surface has an opening that extends essentially across the whole width of the web-formed material. A distributing member, in the form of an arcuate perforated, sheet-formed element, placed outside the chamber, covers the opening completely. With the distributing member a first flow of process air is divided into a large number of jets, distributed over essentially the whole of the angular area that faces the web-formed material.
    Type: Application
    Filed: December 16, 2003
    Publication date: July 13, 2006
    Inventors: Ingemar Rydell, Ake Ringqvist, Heikki Salo