Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5632575 | Method and apparatus for controlled pumping of bentonite around a pipe jacked tunnel | Frank J. Lorenzen | 1997-05-27 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5632575 | Method and apparatus for controlled pumping of bentonite around a pipe jacked tunnel | Frank J. Lorenzen | 1997-05-27 |