Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE40763 | Horse race starting gate | Donald L. Kammerzell, Mike O'Connor | 2009-06-23 |
| 6637094 | Method for manufacturing a horse race starting gate | Donald L. Kammerzell, Mike O'Connor | 2003-10-28 |
| 6508201 | Horse race starting gate | Donald L. Kammerzell, Mike O'Connor | 2003-01-21 |