Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6161985 | Manhole collar assembly | John D. Tensen | 2000-12-19 |
| 5934820 | Manhole collar assembly and method for producing same | — | 1999-08-10 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6161985 | Manhole collar assembly | John D. Tensen | 2000-12-19 |
| 5934820 | Manhole collar assembly and method for producing same | — | 1999-08-10 |