Patents by Inventor Roger Clarence Haeffner

Roger Clarence Haeffner 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).

  • Arrangement in liquid filters in which the filtrate is divided in two fractions
    Patent number: 5667680
    Abstract: A liquid filter comprises a filter rotor with filtering elements and a container for the filtrate. The filtrate is divided in two fractions, a coarse pre-filtrate derived from that side, where the rotor dives into the liquid, and a clear filtrate derived from the opposite side. The pre-filtrate fraction is extracted from the filtrate space such that the filtrate at the side of the container is forced to pass through a number of openings lying close to the liquid surface of the filtrate and leading to a pre-filtrate outlet, whose openings are spaced apart relative to each other and distributed along the rotor.
    Type: Grant
    Filed: October 25, 1995
    Date of Patent: September 16, 1997
    Assignee: Nordic Water Products AB
    Inventor: Roger Clarence Haeffner