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US 12,230,941 B2Granted
Spark plug
AssigneeNiterra Co., Ltd.
InventorJunji Kimura
Life of this patent
Estimating the term…
Abstract
A spark plug includes a ceramic insulator, and the insulator includes a melted portion formed by melting a surface of a base material. In a cross section of the insulator, the value obtained by dividing a length of an interface between the base material and the melted portion by the length of a line segment connecting two ends of the interface is 1.1 or more and 1.5 or less.
Claims4
A spark plug comprising:
- an insulator that is made of a ceramic,
- wherein the insulator includes a melted portion that is formed by melting a surface of a base material, and
- wherein, in a cross section of the insulator, a value obtained by dividing a length of an interface between the base material and the melted portion by a length of a line segment connecting two ends of the interface is 1.1 or more and 1.5 or less.
Dependencies are inferred from the claim text.