Issued Patents All Time
Showing 26–31 of 31 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5937981 | Reversible, infinitely variable wedging element, force transfer device | Eugene F. Duval | 1999-08-17 |
| 5903345 | Remotely positionable gravity oriented laser scanner | Andrew G. Butler, Eugene F. Duval | 1999-05-11 |
| 5765669 | Reversible, infinitely variable wedging element, force transfer device | Eugene F. Duval | 1998-06-16 |
| 5720112 | Asymmetrical plumb bob and method | John Littleboy, Andrew G. Butler | 1998-02-24 |
| 5680208 | Gravity oriented laser scanner | Andrew G. Butler, Eugene F. Duval, Gregory L. Richards, Mitchell C. Barham, William A. Scott +1 more | 1997-10-21 |
| 4643426 | Game playing implement | — | 1987-02-17 |