Patents by Inventor Heikki Rehakka

Heikki Rehakka 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).

  • Solid-liquid filtration cloth and filtering device
    Patent number: 7931153
    Abstract: The invention relates to a method of making a solid-liquid filtration cloth, a solid-liquid filtration cloth, and a filter in which the solid-liquid filtration cloth is arranged. The filter cloth (7) is provided with yarns (13b) having a highly changing length and a long free run in the weave. When the length of the yarns (13b) is allowed to shorten significantly, a filtration portion (15) on the side of a surface (14) of the cloth obtains a corrugated shape, providing the cloth with a large filtering area.
    Type: Grant
    Filed: March 21, 2005
    Date of Patent: April 26, 2011
    Assignee: Tamfelt Filtration Oy
    Inventors: Antti Makinen, Eino Sorri, Heikki Rehakka, Aimo Rautanen
  • Solid-liquid filtration cloth and filtering device
    Publication number: 20070144957
    Abstract: The invention relates to a method of making a solid-liquid filtration cloth, a solid-liquid filtration cloth, and a filter in which the solid-liquid filtration cloth is arranged. The filter cloth (7) is provided with yarns (13b) having a highly changing length and a long free run in the weave. When the length of the yarns (13b) is allowed to shorten significantly, a filtration portion (15) on the side of a surface (14) of the cloth obtains a corrugated shape, providing the cloth with a large filtering area.
    Type: Application
    Filed: March 21, 2005
    Publication date: June 28, 2007
    Applicant: Tamfelt OYJ ABP
    Inventors: Antti Makinen, Eino Sorri, Heikki Rehakka, Aimo Rautanen
  • Press felt structure and method of manufacturing press felt
    Patent number: 6797121
    Abstract: A method of manufacturing a press felt, a press felt and a base fabric. The press felt comprises a base fabric with a batt fiber layer attached on at least the surface facing a paper web. The base fabric is a laminate comprising at least two separate layers. For the base fabric, one or more base fabric modules are provided, which are assembled with a butt seam into a closed loop.
    Type: Grant
    Filed: May 16, 2003
    Date of Patent: September 28, 2004
    Assignee: Tamfelt Oyj ABP
    Inventors: Kari Hyvönen, Heikki Rehakka, Tauno Virtanen
  • Method of making press felt, and press felt
    Patent number: 6773553
    Abstract: A method of making a press felt, a press felt and a base fabric. The base fabric comprises a surface component on the surface facing the paper web to be dried and a base component below the surface component. The transverse jointing edges of the base component are provided with seam loops, by means of which the base component can be connected into a closed loop. At the first jointing edge of the base fabric the surface component extends for a predetermined distance longer than the base component and forms a seam flap that protects the seam area of the base component.
    Type: Grant
    Filed: May 16, 2003
    Date of Patent: August 10, 2004
    Assignee: Tamfelt Oyj Abp
    Inventors: Kari Hyvönen, Heikki Rehakka, Tauno Virtanen
  • Method of making press felt, and press felt
    Publication number: 20040074624
    Abstract: A method of making a press felt, a press felt and a base fabric. The base fabric comprises a surface component on the surface facing the paper web to be dried and a base component below the surface component. The transverse jointing edges of the base component are provided with seam loops, by means of which the base component can be connected into a closed loop. At the first jointing edge of the base fabric the surface component extends for a predetermined distance longer than the base component and forms a seam flap that protects the seam area of the base component.
    Type: Application
    Filed: May 16, 2003
    Publication date: April 22, 2004
    Applicant: TAMFELT OYJ ABP
    Inventors: Kari Hyvonen, Heikki Rehakka, Tauno Virtanen
  • Press felt structure and method of manufacturing press felt
    Publication number: 20040020622
    Abstract: A method of manufacturing a press felt, a press felt and a base fabric. The press felt comprises a base fabric with a batt fibre layer attached on at least the surface facing a paper web. The base fabric is a laminate comprising at least two separate layers. For the base fabric, one or more base fabric modules are provided, which are assembled with a butt seam into a closed loop.
    Type: Application
    Filed: May 16, 2003
    Publication date: February 5, 2004
    Applicant: TAMFELT OYJ ABP
    Inventors: Kari Hyvonen, Heikki Rehakka, Tauno Virtanen