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. 27, 1995
Filed:
Aug. 02, 1993
Wolfgang Bocker, Eppstein/Taunus, DE;
Christine Kostler, Bad Soden am Taunus, DE;
Hermann Moser, Darmstadt, DE;
Andreas Roosen, Hofheim/Taunus, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
A planar sensor made of ceramic material, for measuring and detecting combustible gases and/or the oxygen content in furnaces or in the exhaust gases of internal combustion engines, is described. The sensor has an at least five-layered structure on the basis of a combination of three zirconium dioxide layers with two aluminum oxide layers, a metallic heating resistor being embedded between two aluminum oxide layers, and three zirconium dioxide layers being combined with two platinum electrodes and one further electrode made of a binary or ternary alloy of platinum with gold, nickel, copper, rhodium, ruthenium, palladium or titanium. A process for fabricating the sensor is also described. It is also possible for the sensor to be combined, according to the invention, with a suitable housing which on its outside is provided with connecting wires and plugs for transmitting the measured signals.