Patents by Inventor Knut E. Bergdahl

Knut E. Bergdahl 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 device for cleaning fluid filters
    Patent number: 4130404
    Abstract: A method and device for cleaning fluid filters of the kind comprising a filter member, which is rotatable to be cleaned by means of centrifugal action, includes a device to reverse the direction of the fluid flow through the filter member during rotation thereof at a high speed. A device may also be provided for rotating the filter member during filtration.
    Type: Grant
    Filed: October 31, 1977
    Date of Patent: December 19, 1978
    Inventor: Knut E. Bergdahl
  • Air supply register
    Patent number: D284996
    Type: Grant
    Filed: February 6, 1984
    Date of Patent: August 5, 1986
    Inventor: Knut E. Bergdahl
  • Channel body for an air supply register
    Patent number: D291914
    Type: Grant
    Filed: February 12, 1986
    Date of Patent: September 15, 1987
    Inventor: Knut E. Bergdahl