Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6238277 | Multidisc floor grinder | C. Warren Duncan | 2001-05-29 |
| 5791979 | Grinding vacuum shroud | C. Warren Duncan | 1998-08-11 |
| 5481772 | Bed rail apparatus | Kathleen E. Monahan | 1996-01-09 |
| 5145153 | Portable handrail counter-weight system | — | 1992-09-08 |
| 5090397 | Pile cutter support | Robert H. Larsen, B. Holt Whatley | 1992-02-25 |
| 5074044 | Dust disposal attachment for a rotary element of a power tool | C. Warren Duncan | 1991-12-24 |
| 5054576 | Roof lifeline safety system and anchor assembly therefor | — | 1991-10-08 |