SPARK PLUG WITH A RING/OPEN-RING SHAPED GROUND ELECTRODE - Patent 0451264

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EP 0 451 264 A1

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(43)	Date of publication:
	16.10.1991 Bulletin 1991/42

(21)	Application number: 91900245.0

(22)	Date of filing: 13.10.1990

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International Patent Classification (IPC):

H01T 13/ 32^{( . )}

H01T 13/ 46^{( . )}

(86)	International application number:
	PCT/EP1990/001738

(87)	International publication number:
	WO 1991/006142 (02.05.1991 Gazette 1991/10)

(84)	Designated Contracting States:
	AT BE CH DE DK ES FR GB GR IT LI LU NL SE

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Priority:

13.10.1989 US 19890421172

(71)	Applicants:
	ULTRA PERFORMANCE INTERNATIONAL Clearwater, FL 34616 (US) NITHARDT, Roland CH-1400 Yverdon-les-Bains (CH)

(72)	Inventor:
	JOHNSON, James, E. Clearwater, FL 34616 (US)

(74)	Representative: Nithardt, Roland
	Cabinet Roland Nithardt, Conseils en Propriété Industrielle S.A., Y-Parc Scientifique et Technologique, Chemin de la Sallaz, Case postale 3347 CH-14 CH-14 (CH)

(54)	SPARK PLUG WITH A RING/OPEN-RING SHAPED GROUND ELECTRODE