Spark plug with a ground electrode concentrically disposed to a central electrode and having precious metal on firing surfaces
US5430346A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 9, 1993 |
| Grant date | Jul 4, 1995 |
| Priority date | — |
| Expiry date | Nov 9, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/467
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spark plug for an internal combustion engine wherein a ring shaped ground electrode has a uniform annular hole with an internal diameter about 0.80 to 1.25 times the outer diameter of the center electrode. The ground electrode is vertically spaced below the center electrode and is concentric therewith. The ground electrode is connected to one or more mounting posts attached to a spark plug metal housing. Firing surfaces of the ground and center electrode have platinum alloy inserts laser welded in place. The spark from the center electrode to the ground electrode has multiple paths and results in a spark plug which improves fuel combustion, increases gasoline mileage and engine horsepower and torque and significantly reduces the smolder time or ignition delay time and consequently reduces environmental pollutants of nitrogen oxide, carbon monoxide and other hydrocarbons.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.