Spark plug with an improved seal
US7969077B2 · kind B2 · utility
3Cited by
14References
33Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 15, 2007 |
| Grant date | Jun 28, 2011 |
| Priority date | — |
| Expiry date | Jun 15, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/41
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A spark plug having a glass seal formed from a first glass material and a second glass material. The first glass material has a glass transition temperature/softening point that is greater than the glass transition temperature/softening point of the second glass material. The first glass material and second glass material form a matrix and when combined with a filler have thermal expansion rates and properties the approximate leaded glass.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.