Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5816229 | Internal combustion engine with hemi-spherical cylinder head and matched radiused piston | Frederick P. Hall | 1998-10-06 |
| D399212 | Radiused piston head | Frederick P. Hall | 1998-10-06 |