Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D273622 | Floor maintenance machine | Roger D. Star, Logan Johnson | 1984-04-24 |
| 4334335 | Scrubber with hydraulic squeegee lift | Keith N. Krier, Ranjan K. Nirgude | 1982-06-15 |
| 4262382 | Multi-speed brush control | Keith N. Krier, Donald J. Haub, Steven J. A. Waldhauser | 1981-04-21 |