Harri Hakala
51Patents
14h-index
25Co-inventors
84Inventor score
Filing activity: May 20, 1987 → Feb 4, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5429211A | Traction sheave elevator | Performing Operations; Transporting | 49 | Expired |
| US5469937A | Traction sheave elevator with drive machine below | Performing Operations; Transporting | 35 | Expired |
| US5971109A | Arrangement for releasing the brake of an elevator machinery | Performing Operations; Transporting | 33 | Expired |
| US7500544B2 | Elevator system and method for verifying a destination call | Performing Operations; Transporting | 31 | Active |
| US5490578A | Structure for attaching elevator machinery in a building | Performing Operations; Transporting | 30 | Expired |
| US5899301A | Elevator machinery mounted on a guide rail and its installation | Performing Operations; Transporting | 27 | Expired |
| US5740888A | Arrangement in an opening in the wall of an elevator shaft and instrument panel | Performing Operations; Transporting | 22 | Expired |
| US5435417A | Elevator motor placed in the counterweight | Performing Operations; Transporting | 21 | Expired |
| US5847533A | Procedure and apparatus for braking a synchronous motor | Electricity | 20 | Expired |
| US5878847A | Arrangement for fixing an elevator rope | Performing Operations; Transporting | 19 | Expired |
| US5962948A | Elevator motor with flat construction | Performing Operations; Transporting | 17 | Expired |
| US5573084A | Elevator drive machine placed in the counterweight | Performing Operations; Transporting | 16 | Expired |
| US6148962A | Traction sheave elevator, hoisting unit and machine space | Performing Operations; Transporting | 14 | Expired |
| US6021873A | Procedure and apparatus for the measurement of elevator load | Performing Operations; Transporting | 14 | Expired |
| US5229558A | Control of an elevator hoisting motor during under voltage conditions in the main power source | Performing Operations; Transporting | 13 | Expired |
| US8132652B2 | Elevator system including plurality of elevators operating in same hoistway | Performing Operations; Transporting | 13 | Active |
| US5566785A | Elevator drive machine placed in the counterweight | Performing Operations; Transporting | 13 | Expired |
| US5278484A | Procedure and apparatus for braking a squirrel-cage elevator motor fed by a frequency converter in fault situations | Electricity | 10 | Expired |
| US5982060A | Elevator machinery | Performing Operations; Transporting | 10 | Expired |
| US6199666A | Elevator drive machine | Electricity | 10 | Expired |
| US5665944A | Elevator machinery | Performing Operations; Transporting | 10 | Expired |
| US5821476A | Device for emergency operation of an elevator motor | Performing Operations; Transporting | 9 | Expired |
| US5783895A | Elevator motor with flat construction | Performing Operations; Transporting | 8 | Expired |
| US5163172A | Procedure and apparatus for the measurement of the currents in a frequency converter | Electricity | 8 | Expired |
| US6374964B2 | Holding brake for a traction sheave elevator | Performing Operations; Transporting | 8 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.