Patents by Inventor Seppo Haavisto

Seppo Haavisto 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: 5604995
    Abstract: The invention relates to wire seals for use in a drying space of a Condebelt.RTM. drying apparatus described in Finnish Patent 54 514. In the apparatus, a material web to be dried passes in a substantially airless space between two metal bands (1, 7), or other similar bands or membranes of good thermal conductivity, together with drying wires. One of the metal bands is arranged to heat and the other is arranged to cool; the heating band (1) evaporates moisture contained in the web (2) to be dried, the moisture condensing on the surface of the cooling band (7), separated from the web to be dried by drying wires (3, 4). The drying space between the bands (1) and (7) of the Condebelt.RTM.
    Type: Grant
    Filed: May 2, 1994
    Date of Patent: February 25, 1997
    Assignee: Valmet-Tampella Oy
    Inventors: Jukka Lehtinen, Paavo Rautakorpi, Seppo Haavisto
  • Patent number: 5594996
    Abstract: A drying apparatus for drying a fibre web (5) between two air-tight bands (1, 2) moving in the same direction. One band (1) is heated by hot steam and the other band (2) is cooled by water, and the fibre web (5) is passed through a drying zone formed by the bands (1, 2) with at least one felt or wire (3, 4) so that the fibre web (5) is in contact with the surface of the heated band, and the felt or wire (3, 4) is between the fibre web (5) and the cooled band (2). In the invention the drying zone and the water chamber (14) cooling the lower band (2) are in communication with each other for controlling the pressure difference between them by a simple connection, such as a pipe (25) opening at a suitable height.
    Type: Grant
    Filed: August 1, 1994
    Date of Patent: January 21, 1997
    Assignee: Valmet-Tampella Oy
    Inventor: Seppo Haavisto
  • Patent number: 5572832
    Abstract: A support structure having a beam portion (2) undergoing bending when the load is imposed on the support structure and a separate elastic member (1a) which deforms elastically in a manner inversely proportional to beam bending from the middle of the support structure towards its ends so that the sum of the deformation produced by beam bending and the deformation of the elastic member is constant, whereby a longitudinal support line in the support structure remains as a straight line even though the support structure itself yields in the direction of the force.
    Type: Grant
    Filed: September 30, 1994
    Date of Patent: November 12, 1996
    Assignee: Tampella Papertech Oy
    Inventors: Seppo Haavisto, Risto Sutti
  • Patent number: 5566472
    Abstract: The invention relates to seals for use at band edges in a Condebelt.RTM. apparatus described in Finnish Patent 54 514. In the apparatus, a material web to be dried passes in a substantially airless space between two metal bands (1, 7) or other similar bands or membranes of good thermal conductivity together with drying wires. One of the metal bands is arranged to heat and the other is arranged to cool; the heating band (1) evaporates moisture contained in the web to be dried, the moisture condensing on the surface of the cooling band (7), separated from the web (2) to be dried by drying wires. The drying space between the bands of the Condebelt.RTM. apparatus is sealed up at the edges by seal profiles (10, 11) attached to the heating band (1) or the cooling band (7). It is also possible to use a number of seal profiles positioned against each other or side by side.
    Type: Grant
    Filed: May 2, 1994
    Date of Patent: October 22, 1996
    Assignee: Valmet-Tampella Oy
    Inventors: Jukka Lehtinen, Paavo Rautakorpi, Seppo Haavisto