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. 05, 1984
Filed:
Aug. 23, 1982
Applicant:
Inventors:
Assignee:
Robert Bosch GmbH, Stuttgart, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01M / ;
U.S. Cl.
CPC ...
73116 ; 73 35 ;
Abstract
To protect the light guide element of a combustion sensor, for example combined with a spark plug, and extending through a bore in the center electrode thereof against high temperatures and attach due to environmental conditions occurring within the combustion chamber, a protective element of a high temperature resistant, light transmitting ceramic, preferably alpha-crystalline aluminum oxide is located at the combustion end portion, for example in form of a disc 14, held in position by a turned-over flange of the end portion of the center electrode 13 of a spark plug-sensor combination.