Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5856724 | High efficiency, extended life spark plug having shaped firing tips | Randolph Kwok-Kin Chiu, Keith A. Penney, William T. Phillips | 1999-01-05 |
| 5821676 | Spark plug with grooved, tapered center electrode | Ray W. Atchinson, Dale Lavern Freed, Jr., John Franklin Mc Keon, Jr., Charles D. Oakley, Gamdur S. Mann +1 more | 1998-10-13 |
| 5527198 | High efficiency, extended life spark plug having shaped firing tips | Randolph Kwok-Kin Chiu, Keith A. Penney, William T. Phillips | 1996-06-18 |