Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4312271 | Delay detonator device | Edward A. Day, Petry B. Ritter | 1982-01-26 |
| 4239004 | Delay detonator device | Edward A. Day, Perry B. Ritter | 1980-12-16 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4312271 | Delay detonator device | Edward A. Day, Petry B. Ritter | 1982-01-26 |
| 4239004 | Delay detonator device | Edward A. Day, Perry B. Ritter | 1980-12-16 |