Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6499182 | Convertible blower port for vacuum cleaner | Robert C. Berfield, Ronald Griffin, Kevin D. Fry | 2002-12-31 |
| 6347430 | Self-evacuating vacuum cleaner | Robert C. Berfield | 2002-02-19 |