Patents by Inventor Dag Birkeland

Dag Birkeland 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).

  • Device comprising an elongated tubular body arranged to be located in water
    Patent number: 6402459
    Abstract: The invention relates to a device (1), including an elongated tubular body (3) arranged to be located in water in an essentially vertical position. The tubular body (3) includes an open end (6) at the bottom and a narrowing portion (7) at the top, which ends in an opening (8) arranged to be located above the level of the surrounding water (2). The device (1) is arranged to establish a water level in the narrowing portion (7) of the tubular body (3), which is lower than the level of the surrounding water and to intermittently level out this level difference in such a way that the water in the tubular body (3) is transported up to a higher level than the level of the surrounding water by the action thereon of the narrowing portion (7).
    Type: Grant
    Filed: September 13, 2000
    Date of Patent: June 11, 2002
    Inventors: Mikael Pauli, Dag Birkeland