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:
Apr. 23, 2002
Filed:
Dec. 14, 1999
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A sensor element for limiting-current sensors for determining the lambda value of gas mixtures, in particular of exhaust gases from internal combustion engines. The sensor element has inner and outer pump electrodes arranged on a solid electrolyte foil. The inner pump electrode is arranged in a diffusion channel that is bordered by a diffusion barrier, the pump electrode lying in the diffusion direction of the gas mixture downstream of the diffusion barrier. The gas entry hole, essentially perpendicular to the surface of the solid electrolyte foil, is led through the solid electrolyte foil into the diffusion channel. The diffusion barrier is arranged so as to be set back in the diffusion channel from the interior wall of the gas entry hole. For manufacturing the sensor element, a chamber created upstream of the diffusion barrier is filled with a cavity-creating material, which evaporates in the sintering of the sensor element and thus forms a cavity in the diffusion channel.