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, 1989
Filed:
Nov. 03, 1987
Applicant:
Inventor:
Roland Stahl, Freiberg, DE;
Assignee:
Robert Bosch GmbH, Stuttgart, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
204428 ; 204424 ; 204425 ; 204427 ;
Abstract
To accurately control access of measuring gas into the measuring electrode (15) of a polarographic sensor having a tubular body (12) of solid electrolyte material, the tubular body is enclosed within a protective sleeve (38) closed at one end and embodying a diffusion resistance element, or diffusion resistance zone (43/1, 43/2); if the sleeve is of metal, a separate diffusion resistance element, for example, made of aluminum oxide or spinell may be used; if the sleeve is made of ceramic, the end portion may be thickened and the diffusion resistance zone formed therein, for example, by micropores or microchannels or microducts extending therethrough.