Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4991693 | Method of improving the landing of a hydraulic elevator car | Lawrence Stern | 1991-02-12 |
| 4932502 | Hydraulic elevator system | David Kutz | 1990-06-12 |
| 4785914 | Elevator system leveling safeguard control and method | Richard H. Ludwig | 1988-11-22 |
| 4784240 | Method for using door cycle time in dispatching elevator cars | Robert C. MacDonald, Gerald M. Rees, Elsa Abrego, Matthew Martin, Jon Jay Howard +1 more | 1988-11-15 |
| 4766978 | Elevator system adaptive time-based block operation | Denis D. Shah | 1988-08-30 |
| 4765442 | Elevator system graceful degradation of bank service | Denis D. Shah, Jean-Huang Chen | 1988-08-23 |
| 4762204 | Elevator system master car switching | Jean-Huang Chen | 1988-08-09 |