Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D317136 | Hall location direction panel for elevators | Richard Polacek | 1991-05-28 |
| D317137 | Hall location direction panel for elevators | Richard Polacek, William A. Weirsman | 1991-05-28 |
| D315527 | Call button indicator for an elevator | William A. Weirsman | 1991-03-19 |