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:
Mar. 16, 1993
Filed:
Oct. 10, 1991
Applicant:
Inventors:
Assignee:
Dragerwerk Aktiengesellschaft, Lubeck, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A62B / ; G01N / ;
U.S. Cl.
CPC ...
422 55 ; 422 88 ; 422120 ; 422122 ; 116-2 ; 12820222 ; 12820226 ; 12820528 ;
Abstract
A moisture indicator for indicating the state of moisture loading of an oxygen-releasing chemical in a respiratory protection device which contains the peroxide of an alkali metal as the substance is to be improved such that it will indicate an irreversible and clearly recognizable color change and will respond to the intrusion of even small amounts of moisture. To accomplish this task, the substance contains as the reactive substance an additive in the form of an alkali metal ozonide that engages in a color reaction with moisture present in the air.