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:
Sep. 04, 2007
Filed:
Dec. 22, 2000
Applicant:
Jorgen Christensen, Bjerringbro, DK;
Inventor:
Jorgen Christensen, Bjerringbro, DK;
Assignee:
Grundfos a/s, , DK;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04B 17/03 (2006.01); H02K 5/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
The method is provided for operating a pump unit with a centrifugal pump which is driven by an electric motor and which comprises a rotor running in a split tube. The rotor space is separated with respect to the stator in a fluid-tight manner. On running the motor to its operational rotational speed the fluid located in the rotor space due to the increasing rotational speed evaporates and is removed so that the motor finally functions as a dry-runner.