Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4909053 | High security door locking device | Walter O. Zipf, III, Jack E. Zipf, Dewayne H. Meyer | 1990-03-20 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4909053 | High security door locking device | Walter O. Zipf, III, Jack E. Zipf, Dewayne H. Meyer | 1990-03-20 |