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. 05, 1985
Filed:
Jan. 19, 1984
Gerhard Holfelder, Ditzingen, DE;
Klaus M/u/ ller, Tamm, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
To provide access of gases to an electrode (39, 48) positioned on a flat plate (35) of solid electrolyte material, under controlled conditions, and while preventing access of gases to the electrodes where not desired, the electrodes are covered with a porous cover layer (42, 49) of sintered granular material, for example of zirconium dioxide, having a grain size of 10 .mu.m, and 25 .mu.m thick, with void or pore-formation material added thereto which, upon sintering, becomes volatile and leaves a porous structure. A gas-tight tunnel covering (44, 51) extends over the electrode and filler covering leaving an open space in those regions where the electrode is exposed to the desired gas, for example a test gas adjacent the sensing end (11/1) of the sensor, or oxygen from ambient air adjacent the connecting or terminal end (11/3) of the sensor, the respective gas to be applied to the electrode diffusing through the pores of the porous structure to the respective electrode.