Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5632317 | Roll-up door | Leroy G. Krupke, Dennis A. Kalgren, Anthony J. Shelton | 1997-05-27 |
| 5601133 | Roll-up door | Leroy G. Krupke, Dennis A. Kalgren, Anthony J. Shelton | 1997-02-11 |