Spark plug with improved seal
US9893495B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Aug 1, 2016 |
| Grant date | Feb 13, 2018 |
| Priority date | — |
| Expiry date | Aug 1, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T21/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An electrically conductive glass seal for providing a hermetic bond between an electrically conductive component and an insulator of a spark plug is provided. The glass seal is formed by mixing glass frits, binder, expansion agent, and electrically conductive metal particles. The glass frits can include silica (SiO2), boron oxide (B2O3), aluminum oxide (Al2O3), bismuth oxide (Bi2O3), and zinc oxide (ZnO); the binder can include sodium bentonite or magnesium aluminum silicate, polyethylene glycol (PEG), and dextrin; the expansion agent can include lithium carbonate; and the electrically conductive particles can include copper. The finished glass seal includes the glass in a total amount of 50.0 to 90.0 weight (wt. %), and electrically conductive metal particles in an amount of 10.0 to 50.0 wt. %, based on the total weight of the glass seal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.