Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4615070 | Sweeper with speed control for brush and vacuum fan | Sherman B. Frederick, Charles E. Grimes | 1986-10-07 |
| D273620 | Power sweeper | David W. Berg, Warren L. Larson | 1984-04-24 |
| 4373227 | Surface maintenance equipment | Sherman B. Frederick | 1983-02-15 |
| 4355435 | Surface maintenance equipment | Daniel J. Super | 1982-10-26 |
| 4320556 | Surface maintenance equipment | John L. Hanna | 1982-03-23 |