Spark plug
US10651632B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 8, 2019 |
| Grant date | May 12, 2020 |
| Priority date | — |
| Expiry date | Jul 8, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/32
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spark plug includes a tip extending in a first direction and an electrode base metal having an extending portion extending in the first direction and connected to the tip through a fusion zone. In a section taken along the first direction and containing a center axis of the tip, in a case where two ends of the interface between the extending portion and the fusion zone are located at the same position with respect to the first direction, the linear distance between the ends is denoted by A, or, in a case where one end is located forward of the other end, the distance from the one end to an intersection between a straight line passing the one end and extending perpendicularly to the center axis and the outline of the fusion zone is denoted by A. The interface length B satisfies a relational expression B/A≥1.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.