Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5239923 | Screen printer | John R. Coulter | 1993-08-31 |
| 5020430 | Printer | Charles W. Harpold | 1991-06-04 |
| 4920878 | Screen printer with plater sifting structure | Charles W. Harpold | 1990-05-01 |
| 4817523 | Flat bed screen printing press | Charles W. Harpold | 1989-04-04 |