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. 10, 1981
Filed:
Oct. 25, 1978
Hans Rickert, Dortmund, DE;
Gunter Holzapfel, Dortmund, DE;
Vereinigte Elektrizitatswerke Westfalen AG, Dortmund, DE;
Abstract
An anticorrison protected small electric household water heating tank includes a metal tank having a passive anticorrosive layer provided on an inner wall thereof. A U-shaped electric immersion heating element is horizontally arranged in a lower region of the tank. A pair of electrodes are supplied with external current, one being an external current anode horizontally arranged above and perpendicular to the arms of the U-shaped heating element and the other being the tank itself. A reference electrode is also provided in the lower region of the tank. A potentiostat is connected to the reference electrode and tank for detecting the potential between the reference electrode and tank, for comparing the detected potential between tank and reference electrode to a reference voltage and for adjusting the current flow to the external electrodes to maintain an optimum potential between the tank and reference electrode. The reference electrode is of 'Ag/AgCl' and is surrounded by a flow preventing sheathing which creates a zone of stagnant water about the reference electrode. An additional anode can be provided in the upper region of the tank and the current therethrough controlled by the potentiostat.