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. 21, 1992
Filed:
May. 30, 1990
Applicant:
Inventors:
Friedrich E Schneider, Pforzheim, DE;
Peter Tautzenberger, Niefern-Oschelbronn, DE;
Assignee:
G. Rau GmbH & Co., Pforzheim, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01T / ;
U.S. Cl.
CPC ...
313141 ; 313355 ;
Abstract
A central electrode for spark plugs of internal-combustion engines, comprising a core of a highly heat-conductive base metallic material which is provided in the region of the firing tip with a precious metal casing consisting of silver or a silver alloy with predominantly silver content. At the boundary surface between the core material and the casing at least one interlayer is provided which is oxygen-impermeable and/or prevents the formation of a eutectic between the core material and the material of the casing.