Eiki Watanabe
35Patents
12h-index
15Co-inventors
78Inventor score
Filing activity: Aug 6, 1975 → Jan 14, 2020
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4979593A | Elevator controller | Performing Operations; Transporting | 88 | Expired |
| US4666020A | Control apparatus for elevator | Performing Operations; Transporting | 46 | Expired |
| US4506766A | Method and apparatus for fault time operating of an elevator _ | Performing Operations; Transporting | 37 | Expired |
| US4935684A | Control system for induction motor | Emerging Cross-Sectional Technologies | 24 | Expired |
| US4503940A | Variable-voltage variable-frequency elevator control apparatus | Electricity | 21 | Expired |
| US4678063A | Apparatus for controlling an elevator | Electricity | 19 | Expired |
| US5547059A | Linear motor elevator system | Performing Operations; Transporting | 17 | Expired |
| US4567419A | Control apparatus for elevator | Electricity | 16 | Expired |
| US4748394A | Control apparatus for escalator | Performing Operations; Transporting | 15 | Expired |
| US4271931A | Elevator control device | Performing Operations; Transporting | 14 | Expired |
| US4337846A | Elevator relevelling control apparatus | Performing Operations; Transporting | 13 | Expired |
| US4434873A | Electric elevator car driving device | Performing Operations; Transporting | 12 | Expired |
| US4516665A | Elevator control system | Electricity | 11 | Expired |
| US4269286A | Speed control apparatus for elevator system | Performing Operations; Transporting | 11 | Expired |
| US4756398A | Passenger conveyor apparatus | Performing Operations; Transporting | 11 | Expired |
| US4284175A | Emergency stop apparatus for electric elevators | Electricity | 10 | Expired |
| US5131507A | Hydraulic elevator control apparatus using VVVF to determine the electric drive motor rotational speed | Performing Operations; Transporting | 10 | Expired |
| US4133413A | Elevator safety device | Electricity | 9 | Expired |
| US4399892A | Thyristor Leonard type elevator control system | Electricity | 9 | Expired |
| US4520906A | Control apparatus for elevator | Performing Operations; Transporting | 8 | Expired |
| US4165801A | Static Leonard system | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4287551A | Elevator traction machine | Electricity | 8 | Expired |
| US5038894A | Drive control apparatus | Mechanical Engineering; Lighting; Heating | 8 | Expired |
| US4027745A | Elevator speed control system | Electricity | 8 | Expired |
| US4086983A | Elevator control system | Electricity | 7 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.