Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5080773 | Ground electrode backfill | Thomas H. Lewis | 1992-01-14 |
| 5026508 | Ground electrode backfill composition, anode bed | Thomas H. Lewis | 1991-06-25 |
| 4994629 | Electrical grounding system | Thomas H. Lewis | 1991-02-19 |
| 4786388 | Ground electrode backfill composition, anode bed and apparatus | — | 1988-11-22 |