The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 22, 1976
Filed:
Feb. 05, 1974
Applicant:
Inventor:
Olav Rasmusson Navelsaker, Oslo, NO;
Assignee:
Thune-Eureka A/S, Oslo, NO;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01D / ; F04B / ;
U.S. Cl.
CPC ...
415-1 ; 4152 / ; 415143 ; 417424 ;
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.