Spark plug and method for manufacturing spark plug
US11309689B2 · kind B2 · utility
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1References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 18, 2021 |
| Grant date | Apr 19, 2022 |
| Priority date | — |
| Expiry date | Aug 18, 2041 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K26/359
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spark plug including an insulator and a metallic member such as a metallic shell. In the spark plug, a mark such as a two-dimensional code is provided on the surface of at least one of the insulator and the metallic member. Also, a protective layer covers the mark. The protective layer is optically transparent and contains a fluorescent substance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.