Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6254489 | Amusement attraction with man-made tornado | Nicholas H. Drobnis, Craig Robert Hanna, Philip Hettema, Cecil D. Magpuri, Edward S. Newquist | 2001-07-03 |
| 4747174 | Grooming attachment for reconditioning the playing surface of a tennis court | — | 1988-05-31 |
| 4533013 | Motorized golf cart | — | 1985-08-06 |