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:
Jul. 09, 2002
Filed:
Jan. 21, 2000
Applicant:
Inventors:
Thomas Böhm, Köln, DE;
Rudi Widt, Köln, DE;
Assignee:
Leybold Vakuum GmbH, , DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01M 0/320 ; G01M 0/302 ;
U.S. Cl.
CPC ...
G01M 0/320 ; G01M 0/302 ;
Abstract
Method for operating, a helium leak indicator ( ) consisting of a helium detector ( ) with evacuation devices comprising at least a high-vacuum pump ( ), a backing pump ( ) and a valve ( ) whose level of flow conductance can be adjusted and serves to modulate the through-flow of test gas to be analyzed; in order to influence the sensitivity in a simple manner, the method provides that the modulation properties be changeable in such a manner that the effective pumping capacity at the inlet of the leak indicator is changed by the adjustment of the modulation properties.