Patents by Inventor Aulis Perälä

Aulis Perälä 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).

  • Filter cloth and replaceable filter module
    Patent number: 7370766
    Abstract: A filter cloth whose underside comprises substantially parallel, additional yarns 8 that are thicker than the rest of the yarns of the cloth, substantially parallel channels 9 being formed between the yarns, wherein filtered liquid passed through the cloth is allowed to flow in the direction of the surface of a filtering element 10 between the filtering portion of the cloth and the surface of the element. The invention further relates to a filtering module manufactured from the filter cloth of the invention.
    Type: Grant
    Filed: November 14, 2003
    Date of Patent: May 13, 2008
    Assignee: Tamfelt OYJ ABP
    Inventor: Aulis Perälä
  • Filter cloth and replaceable filter module
    Patent number: 6719148
    Abstract: A filter cloth whose underside comprises substantially parallel, additional yarns that are thicker than the rest of the yarns of the cloth, substantially parallel channels being formed between the yarns, wherein filtered liquid that passed through the cloth, is allowed to flow in the direction of the surface of a filtering element between the filtering portion of the cloth and the surface of the element. The invention further relates to a filtering module manufactured from the filter cloth of the invention.
    Type: Grant
    Filed: November 8, 2001
    Date of Patent: April 13, 2004
    Assignee: Tamfelt OYJ ABP
    Inventor: Aulis Perälä
  • Method for manufacturing shrink fabric, and shrink fabric
    Patent number: 6658709
    Abstract: A method for manufacturing a shrink fabric, and a shrink fabric to be used for filtering. The method is used for manufacturing a shrink fabric (1, 1′) comprising a seam assembly (4) which is substantially diagonal with respect to the lateral direction of the shrink fabric (1, 1′). When arranged in place onto a drum filter, the seam assembly (4) of the shrink fabric (1, 1′) is substantially diagonal with respect to the lateral direction of the drum (2) of the drum filter.
    Type: Grant
    Filed: October 19, 2001
    Date of Patent: December 9, 2003
    Assignee: Tamfelt OYJ ABP
    Inventors: Aulis Perälä, Eino Sorri