Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5083500 | Radon treatment system and method | Thomas Francis | 1992-01-28 |
| 5080004 | Clean-out pipe receptacle | Thomas Francis | 1992-01-14 |
| 4981150 | Foundation drain cleaning apparatus and method | Thomas Francis | 1991-01-01 |
| 4848380 | Foundation drain cleaning apparatus and method | Thomas Francis | 1989-07-18 |