Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6124383 | Cement composition and process therewith | Howard F. Efner | 2000-09-26 |
| 5932671 | Polymerization process | Howard F. Efner, Earl Clark, Jr. | 1999-08-03 |
| 4949621 | Liquid propellant gun | — | 1990-08-21 |
| 4608531 | Test set for testing as a unit an amplifier system having several modules | — | 1986-08-26 |