Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6170731 | Method and apparatus for friction torque welding | David V. Hofius, Sr. | 2001-01-09 |
| 6041164 | Expansion and mounting apparatus for infrared radiant energy source | David V. Hofius, Sr. | 2000-03-21 |
| 5772103 | Method and apparatus for friction torque welding | David V. Hofius, Sr. | 1998-06-30 |
| 5423938 | Hot air cold form staking device | David V. Hofius, Sr. | 1995-06-13 |