Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4986777 | Marine engine oil drainage device | — | 1991-01-22 |
| 4715395 | Fluid flow regulator | Roy J. Mainelli | 1987-12-29 |
| 4357859 | Pressure sensor | Robert G. Yeaton | 1982-11-09 |
DP
Donald Preston
Overall (All Time): #1,663,393 of 4,157,543Top 45%
3
Patents All Time