Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5357876 | Portable hinged riser | John H. Kniefel, Glenn G. Kanengieter, Frank C. Krumholz | 1994-10-25 |
| 5343817 | Portable podium and performance platform system | John H. Kniefel | 1994-09-06 |