Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5641909 | Scan assembly structure | Karl F. Kiefer, Donald Chaffee, C. Grissom Steele, Terry P. Clifton | 1997-06-24 |
| 5624206 | Apparatus and method for supporting pipe main repair tools in an excavation | John H. Cohen, Curtis E. Leitko, Jr., Terry P. Clifton, Gerald Rockower | 1997-04-29 |