Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| H1072 | One-man gas particulate filter unit | John D. Estes, John E. Lambright | 1992-07-07 |
| 4581986 | Contamination reducing airlock and entry system | Charles H. Keck, Jr. | 1986-04-15 |