Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6220277 | Flow metering solenoid valve | — | 2001-04-24 |
| 5992573 | Elevator up start | — | 1999-11-30 |
| RE36022 | Servo control for hydraulic elevator | — | 1999-01-05 |
| 5810118 | Elevator position lock | — | 1998-09-22 |
| 5593004 | Servo control for hydraulic elevator | — | 1997-01-14 |
| 5232070 | Up leveling control system for small elevators | — | 1993-08-03 |
| 4800990 | Three speed valve control for high performance hydraulic elevator | — | 1989-01-31 |
| 4637495 | Pressure/viscosity compensated up travel for a hydraulic elevator | — | 1987-01-20 |
| 4601366 | Down valve for the down speed control of a hydraulic elevator | — | 1986-07-22 |