Negative electron affinity spark plug
US5550425A · kind A · utility
12Cited by
7References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 27, 1995 |
| Grant date | Aug 27, 1996 |
| Priority date | — |
| Expiry date | Jan 27, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/39
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spark plug having a positive electrode spark tip which is covered with a ery thin layer (.ltoreq.20 nanometers) of very hard NEA material having very large chemical binding energies such that most elements, including carbon and nitrogen, will not bind to its surface. The NEA material may be sapphire, or may be an n-type impurity-doped semiconductor material such as n-type AlN, cBN, or GaAlN having a bandgap exceeding 5.5 eV.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.