Patents by Inventor Olav Rasmusson Navelsaker

Olav Rasmusson Navelsaker 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 of pumping liquid with a submerged rotary pump and pump for carrying out the method
    Patent number: 3964836
    Abstract: By pumping a liquid with a submerged rotary pump the distance from the submerged pump to the top of the riser pipe can be substantial and the liquid column left in the riser pipe from the pump constitutes a not insignificant residue. When the liquid level in the tank has sunk to the pump, the liquid in the riser pipe is caused to pass down into the pump and into and up through a relatively narrow pipe which leads from the pump housing at the pressure side of the pump impeller, the rotary impeller acting as check valve for the liquid.
    Type: Grant
    Filed: February 5, 1974
    Date of Patent: June 22, 1976
    Assignee: Thune-Eureka A/S
    Inventor: Olav Rasmusson Navelsaker