Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4625721 | Smoke mask | Harold H. Levine, Thomas K. Hale | 1986-12-02 |
| 4559939 | Compatible smoke and oxygen masks for use on aircraft | Harold H. Levine, Thomas K. Hale | 1985-12-24 |
| 4415177 | Folding wheelchair | Thomas K. Hale | 1983-11-15 |
| 4266305 | Wheelchair for transportation vehicles | Thomas K. Hale | 1981-05-12 |