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:
Feb. 22, 1977
Filed:
Aug. 18, 1975
Applicant:
Inventor:
Detlef Vandamme, Berlin, DT;
Assignee:
Siemens Aktiengesellschaft, Munich, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
165 11 ; 62129 ; 310 53 ;
Abstract
The invention is directed to a leak indicating apparatus for the closed cooling system of an electric machine. The elevation of the coolant level in the expansion tank of the cooling system as well as the measured average temperature of the coolant are translated into electrical signals which are compared with each other. Only when there is a deviation from the normal volume-temperature proportionality and after a time delay, is replenishing coolant supplied or an indicating device actuated.