Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4377017 | Scrubbing machine with water regeneration | Ferdinand J. Herpers, Alfred D. Carlson, Paul D. Dodge | 1983-03-22 |
| 4310944 | Surface maintenance machine having air recirculation | Donald L. Thomsen, III | 1982-01-19 |
| 4295244 | Scrubbing machine with water regeneration | Ferdinand J. Herpers, Alfred D. Carlson, Paul D. Dodge | 1981-10-20 |
| 4206530 | Surface maintenance machine having air recirculation | Donald L. Thomsen, III | 1980-06-10 |
| 4194263 | Scrubbing machine with water regeneration | Ferdinand J. Herpers, Alfred D. Carlson, Paul D. Dodge | 1980-03-25 |