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:
Oct. 30, 1979
Filed:
Jan. 10, 1978
Applicant:
Inventor:
Hans Limp, Cologne, DE;
Assignee:
Leybold-Heraeus GmbH & Co. KG, Cologne, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G12B / ;
U.S. Cl.
CPC ...
73 / ;
Abstract
A calibrated gas source for testing leakage indicators composed of a housing divided into two chambers by a partition having a gas passage between the chambers, a mass of liquefied gas filling one of the chambers, a valve associated with the passage for permitting gas to pass from the one chamber to the other chamber when it is under a certain excess pressure, and a capillary passage between the other chamber and the surrounding environment.