Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4429432 | Sanitizer attachment for a mobile floor cleaner | William M. Copeland, Robert L. Shallenberg | 1984-02-07 |
| 4400843 | Rotary floor cleaner | — | 1983-08-30 |
| 4270238 | Cleaning tool | Robert L. Shallenberg | 1981-06-02 |