Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7234710 | Spring powered vehicle | Michael L. Gray | 2007-06-26 |
| 6820880 | Spring powered wheelbarrow | Michael L. Gray | 2004-11-23 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7234710 | Spring powered vehicle | Michael L. Gray | 2007-06-26 |
| 6820880 | Spring powered wheelbarrow | Michael L. Gray | 2004-11-23 |