Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4709436 | Debris pan for rotary brush sweeper | Robert C. Berfield, Craig A. Seasholtz | 1987-12-01 |
| 4701969 | Rotary brush sweeper with easily separable debris pan | Robert C. Berfield, Craig A. Seasholtz | 1987-10-27 |
| D290055 | Sweeper | Robert C. Berfield, R. Lent Crevling, Jr., Ronald F. Meland | 1987-05-26 |
| D289933 | Sweeper | Robert C. Berfield, Craig A. Seasholtz | 1987-05-19 |
| 4658458 | Rotary brush sweeper with mechanism for brush height adjustment | Robert C. Berfield, R. Lent Crevling, Jr., Ronald F. Meland | 1987-04-21 |
| 4642841 | Hand held vacuum cleaner | Robert C. Berfield | 1987-02-17 |
| 4462137 | Electric vacuum cleaner | Robert C. Berfield | 1984-07-31 |
| 4380845 | Nozzle for hand-held vacuum | Jonathan Miller, Kerry E. Strouse | 1983-04-26 |
| 4334337 | Compact wet-dry electric vacuum cleaner | Jonathan Miller, Robert C. Berfield, Kenneth R. Hiester, Rudolph W. Wacek | 1982-06-15 |
| 4330899 | Noise reducing blower motor housing means for vacuum cleaner, or the like | Jonathan Miller, Robert C. Berfield, Kenneth R. Hiester, Rudolph W. Wacek | 1982-05-25 |