Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4638889 | Elevator system | Richard H. Ludwig | 1987-01-27 |
| 4463834 | Elevator system | Marjorie J. Polis | 1984-08-07 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4638889 | Elevator system | Richard H. Ludwig | 1987-01-27 |
| 4463834 | Elevator system | Marjorie J. Polis | 1984-08-07 |