Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4443361 | Silicon carbide resistance element | Frank J. Hierholzer, Jr. | 1984-04-17 |
| 4433233 | Silicon carbide heating elements | Frank J. Hierholzer, Jr., John A. Ancona | 1984-02-21 |
| 4426405 | Method for producing improved silicon carbide resistance elements | Frank J. Hierholzer, Jr. | 1984-01-17 |
| 4328529 | Silicon carbide igniters | Frank J. Hierholzer, Jr., John A. Ancona | 1982-05-04 |
| 4302508 | Silicon carbide elements | Frank J. Hierholzer, Jr., John A. Ancona | 1981-11-24 |