Patents by Inventor Matti Viitasaari

Matti Viitasaari 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 system for purification of waste water
    Patent number: 6319407
    Abstract: Method and system for the purification of waste water. In the method, all purification functions, including removal of nitrogen and phosphor, are performed in one and the same reactor (1), in which several alternating oxidation and reduction zones (2-6) are created in unclarified waste water flowing through it by supplying each zone with gas mixtures with different oxygen contents as needed for the purification function to be performed in the zone from a gas distributor (8), in such manner that oxygen-rich gas containing 30-50% oxygen is supplied for oxidation while gas with a low oxygen content of 0-5% is supplied for reduction.
    Type: Grant
    Filed: September 22, 1999
    Date of Patent: November 20, 2001
    Assignees: Sakkivaline Oy, Systox Oy
    Inventors: Raimo M{umlaut over (aa)}ttä, Matti Viitasaari, Antonio Villarreal