Patents by Inventor Kalevi Riihinen

Kalevi Riihinen 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).

  • Patent number: 4139410
    Abstract: A Yankee paper machine, particularly for the production of MG (machine glazed) paper and creped tissue, in which the formed paper web is sandwiched between a Yankee felt and a lower felt, pressed in a first nip between a suction roll and a dewatering roll, carried on the Yankee felt around the suction roll and pressed in a second nip between the suction roll and a Yankee cylinder. The web is adhered to the Yankee cylinder and the Yankee felt is detached from the web, passed around separate rolls and returned to the web on the Yankee cylinder in a third nip which in which adherance of the web to the Yankee cylinder is assured.
    Type: Grant
    Filed: November 1, 1977
    Date of Patent: February 13, 1979
    Inventors: Olli Tapio, Lassi Veijonen, Kalevi Riihinen
  • Patent number: 4033812
    Abstract: A paper machine which has a dewatering system accordng to which during web formation as dewatering progresses the dewatering pressure increases. The stock from a headbox is initially delivered to a single liquid-pervious web-carrying element. As the latter travels away from the headbox with the stock received therefrom it meets a web-pressing element which together with the web-carrying element forms a twin-wire type of construction with the web being compressed between these elements as they travel along a common path. While these elements travel along a common path they are guided by structure which provides for increasing pressure on the web between the elements so that as dewatering progresses the pressure on the web between the elements increases. In this way it is possible to avoid an initial undesirably violent dewatering of the web during an initial phase in the formation thereof. As the above elements travel along their common path the direction of travel thereof preferably is reversed.
    Type: Grant
    Filed: October 24, 1975
    Date of Patent: July 5, 1977
    Assignee: Valmet Oy
    Inventor: Kalevi Riihinen