Spark plug having a resistor element
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 12, 2018
Issued Date -
Oct 5, 2017
app pub date -
Mar 22, 2017
filing date -
Mar 31, 2016
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A spark plug includes a cylindrical metallic shell having a ground electrode at a forward end of the cylindrical metallic shell, a cylindrical insulator held in the metallic shell, a center electrode disposed in the insulator, a resistor element disposed in the insulator and having a forward end located rearward of a rear end of the center electrode, a forward-end-side electrically conductive seal layer disposed in the insulator to be located between the center electrode and the resistor element, and a rear-end-side electrically conductive seal layer disposed in the insulator to be located rearward of the resistor element. The forward end of the resistor element is located forward of the rear end of the metallic shell, and the rear end of the resistor element is located rearward of the rear end of the metallic shell.
First Claim
Other Claims data not available
Family
International Classification(s)
- 2017 Application Filing Year
- H01T Class
- 208 Applications Filed
- 173 Patents Issued To-Date
- 83.18 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 1 Citation Count
- H01T Class
- 27.40 % this patent is cited more than
- 7 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Dec 12, 2025 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Dec 12, 2029 |
