Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7704452 | Alloy and anode for use in the electrowinning of metals | David R. Prengaman | 2010-04-27 |
| 6664003 | Method for enhancing lead oxidation during production of lead acid batteries | R. David Prengaman | 2003-12-16 |