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Patent applications and USPTO patent grants for Holland; Gordon A..The latest application filed is for "leveling control system for hydraulic elevator".
Patent | Date |
---|---|
Leveling control system for hydraulic elevator Grant 4,976,338 - Holland December 11, 1 | 1990-12-11 |
Safety mechanism for preventing unintended motion in traction elevators Grant 4,923,055 - Holland May 8, 1 | 1990-05-08 |
Elevator door arrangement Grant 4,781,270 - Holland November 1, 1 | 1988-11-01 |
Interlock for center opening doors Grant 3,912,049 - Holland , et al. October 14, 1 | 1975-10-14 |
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