Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12110209 | Elevator car door lock | Richard W. Lajeunesse, Zygmunt Dziwak | 2024-10-08 |
| 8447433 | Elevator door wireless controller | — | 2013-05-21 |
| 8006805 | Astragal construction | Darryl Greenaway, Richard W. Lajeunesse, Zygmunt Dziwak, David E. Kairis | 2011-08-30 |
| 7156210 | Freight elevator landing door control | Richard W. Lajeunesse, Zygmunt Dziwak, David E. Kairis | 2007-01-02 |
| 7097003 | Elevator landing door broken chain safety device | Richard W. Lajeunesse, Zygmunt Dziwak, David E. Kairis | 2006-08-29 |
| D482957 | Self-tapping bolt | Richard W. Lajeunesse, Michael P. Lilly | 2003-12-02 |