Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4538971 | Assembly of tank lid and fan means of a wet/dry vacuum | Jonathan Miller, Rudolph W. Wacek, Robert C. Berfield, Ronald F. Meland, Robert L. Crevling, Jr. | 1985-09-03 |
| 4508550 | Air flow responsive outlet from tank of vacuum cleaner | Robert C. Berfield, Robert L. Crevling, Jr. | 1985-04-02 |