Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE42331 | Low impedance grounding electrode with universal connections and rapid access cap | Roy B. Carpenter, Jr., Darwin N. Sletten | 2011-05-10 |
| 7462776 | Low impedance grounding electrode with universal connections and rapid access cap | Darwin N. Sletten, Roy B. Carpenter, Jr. | 2008-12-09 |