Patents Assigned to Virdrill AS
  • Sieve apparatus and method for use of same
    Patent number: 8025152
    Abstract: An apparatus and a method of screening a material containing a solid and fluid where the material is placed on an upper side of a screen element and the material is at least being acted on by vibrations produced by at least one acoustic sound source. The at least one acoustic sound source is arranged to transmit pressure waves to at least a portion of an underside of the screen element.
    Type: Grant
    Filed: March 16, 2006
    Date of Patent: September 27, 2011
    Assignee: Virdrill AS
    Inventors: Jan Kristian Vasshus, Trond Melhus, Harald Knutsen