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:
Jun. 22, 1976
Filed:
Mar. 24, 1975
Rudolf Ehret, Schwetzingen, DT;
Pfaudler-Werke AG, Schwetzingen, DT;
Abstract
A tantalum electrode is provided on a probe dipping into the electrically conducting contents of a reaction vessel of which the steel shell is protected by an enamel layer pierced by one or more protective tantalum plugs and an alternating voltage is applied between the tantalum electrode and the metallic shell of the reaction vessel. Both the electrode and the plug or plugs are provided with a passivating layer by the resulting alternating current and when these layers are formed the current stops except that it continues or starts again when there is a defect in the enamel layer. Very small currents can be used since the a-c component can be filtered and amplified for reliable detection.