Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5592913 | Exhaust valve with a tapered stem portion | — | 1997-01-14 |
WM
William F. Matthews
Overall (1997): #59,577 of 185,788Top 35%
1
Patents 1997