Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7005064 | Method and apparatus for remediating wastewater holding areas and the like | Robert Anthony Keller, William J. Cretens, Kent T. Depuydt, Dana J. Trierweiler, Dean R. Wickoren | 2006-02-28 |
| 6835314 | Method and apparatus for remediating wastewater holding areas and the like | Robert Anthony Keller, William J. Cretens, Kent T. Depuydt, Dana J. Trierweiler, Dean R. Wickoren | 2004-12-28 |
| 6058814 | Extendable tool | — | 2000-05-09 |
| 4428436 | Seed trench digger with indexing structure | — | 1984-01-31 |
| 4338724 | Tool for positioning and defining holes in wall panels | — | 1982-07-13 |