Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8960372 | Elevator car door interlock | Ernest Heath, Anthony Frank Hamlett, Sang Mu Choi, Sang-Hyuk Lee, Chet Willoughby +2 more | 2015-02-24 |
| D367077 | Rotatable sign | Craig Chapman | 1996-02-13 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8960372 | Elevator car door interlock | Ernest Heath, Anthony Frank Hamlett, Sang Mu Choi, Sang-Hyuk Lee, Chet Willoughby +2 more | 2015-02-24 |
| D367077 | Rotatable sign | Craig Chapman | 1996-02-13 |