Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6030657 | Labeling technique for countering product diversion and product counterfeiting | Charles L. Butland | 2000-02-29 |
| 5609224 | Elevator door sill | — | 1997-03-11 |
| 5366044 | Bidirectional eddy current overspeed protection for elevators | Eric K. Jamieson, Young S. Yoo | 1994-11-22 |