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. 29, 2011
Filed:
Sep. 28, 2006
Xavier Jaffrezic, Velizy-villacoublay, FR;
Marc Pariente, Paris, FR;
Xavier Jaffrezic, Velizy-villacoublay, FR;
Marc Pariente, Paris, FR;
Renault S.A.S., Boulogne Billancourt, FR;
Abstract
A spark plug for an internal combustion engine of a motor vehicle, having a substantially cylindrical general form, includes an essentially capacitive lower part and an essentially inductive upper part. The lower part includes two coaxial electrodes, including a central electrode with an axis and a shell electrode that surrounds the central electrode, and an insulator inserted between the central electrode and the shell electrode. The upper part includes a central mandrel surrounded by a coil, a bottom end part of which overlaps a top end part of the central electrode in a radial direction, an external casing, and an insulator inserted radially between the casing and the coil. The top end part of the central electrode has a coating of material which is more electrically conductive than the material of the central electrode and has no ferromagnetic properties.