Issued Patents All Time
Showing 1–18 of 18 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9202248 | Ad matching system and method thereof | Hongguang Bi, Julie Mattern, Matt Meyer, Duc Chau | 2015-12-01 |
| 5984051 | Remote elevator call requests with descriptor tags | Robert G. Morgan, David Crenella, Bruce Zepke, Harold Terry | 1999-11-16 |
| 5929399 | Automatic open loop force gain control of magnetic actuators for elevator active suspension | Thomas He, Daniel S. Williams | 1999-07-27 |
| 5864102 | Dual magnet controller for an elevator active roller guide | Thomas He, Daniel S. Williams | 1999-01-26 |
| 5824976 | Method and apparatus for sensing fault conditions for an elevator active roller guide | Daniel S. Williams | 1998-10-20 |
| 5810120 | Roller guide assembly featuring a combination of a solenoid and an electromagnet for providing counterbalanced centering control | Dang V. Nguyen, Kelly Schaefer | 1998-09-22 |
| 5765663 | Methods and apparatus for preventing undue wear of elevator actuators | Daniel S. Williams | 1998-06-16 |
| 5631452 | System for position loss recovery for an elevator car | Christopher Pietrzykowski, Jeffrey M. Izard | 1997-05-20 |
| 5531294 | Bias torque for elevator hoist drive to avoid rollback, rollforward | Douglas A. Burton | 1996-07-02 |
| 5407028 | Tested and redundant elevator emergency terminal stopping capability | Christopher Pietrzykowski | 1995-04-18 |
| 5407030 | Recalibrating an elevator loadweighing system | Douglas A. Burton | 1995-04-18 |
| 5366044 | Bidirectional eddy current overspeed protection for elevators | Young S. Yoo, Breffni X. Baggot | 1994-11-22 |
| 5345042 | Elevator hitch load weighing tare compensation | — | 1994-09-06 |
| 5343003 | Recalibration of hitch load weighing using dynamic tare | Richard C. McCarthy, Young S. Yoo | 1994-08-30 |
| 5321216 | Restraining elevator car motion while the doors are open | Charles F. Fifield | 1994-06-14 |
| 5301773 | Positive terminal overspeed protection by rail grabbing | Young S. Yoo, Rudi Steger, Richard C. McCarthy | 1994-04-12 |
| 5172782 | Pivot mount of elevator load-weighing at car hitch | Young S. Yoo | 1992-12-22 |
| 5107964 | Separate elevator door chain | Steven D. Coste | 1992-04-28 |