Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4433233 | Silicon carbide heating elements | Frank J. Hierholzer, Jr., Gerald L. Shelton | 1984-02-21 |
| 4328529 | Silicon carbide igniters | Frank J. Hierholzer, Jr., Gerald L. Shelton | 1982-05-04 |
| 4302508 | Silicon carbide elements | Frank J. Hierholzer, Jr., Gerald L. Shelton | 1981-11-24 |