HARMONIC DRIVE SYSTEMS INC.
321Patents
221Active
321Granted
54Portfolio score
Filing activity: Sep 25, 1986 → Feb 17, 2023 · 60 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7077446B2 | Finger unit for robot hand | Performing Operations; Transporting | 97 | Expired |
| US5269202A | Cup-type harmonic drive having a short, flexible cup member | Emerging Cross-Sectional Technologies | 81 | Expired |
| US4823638A | Tooth profile of spline of strain wave gearing | Emerging Cross-Sectional Technologies | 63 | Expired |
| US4974470A | Tooth profile of one of circular splines of flat-shaped strain wave gearing | Emerging Cross-Sectional Technologies | 49 | Expired |
| US7498914B2 | Method for magnetizing ring magnet and magnetic encoder | Electricity | 47 | Expired |
| US6700271B2 | Hybrid synchronous motor equipped with toroidal winding | Electricity | 40 | Expired |
| US5369322A | Electromagnetic motor of the finite rotational type | Electricity | 30 | Expired |
| US4715247A | Transmission apparatus with reduced frictional force | Emerging Cross-Sectional Technologies | 30 | Expired |
| US5984048A | Lubricant supplying mechanism for a wave gear drive | Emerging Cross-Sectional Technologies | 28 | Expired |
| US5906142A | Wave gear drive | Emerging Cross-Sectional Technologies | 28 | Expired |
| US5307885A | Attitude and drilling-direction control device | Mechanical Engineering; Lighting; Heating | 27 | Expired |
| US5775178A | Wave gear device | Emerging Cross-Sectional Technologies | 27 | Expired |
| US5353884A | Positioning device for a member and drilling system employing said positioning device | Fixed Constructions | 26 | Expired |
| US5850765A | Flat wave gear drive | Emerging Cross-Sectional Technologies | 26 | Expired |
| US5918508A | Strain wave gearing having a non-interfering wide mesh range tooth profile | Emerging Cross-Sectional Technologies | 25 | Expired |
| US5782143A | Flexible meshing type gear device with negative deflection passing tooth profile | Emerging Cross-Sectional Technologies | 22 | Expired |
| US6167783A | Flexible meshing type gearing having three-dimensional, non-interactive wide-area intermeshing tooth profile | Emerging Cross-Sectional Technologies | 22 | Expired |
| US8485064B2 | Composite wave gear drive | Emerging Cross-Sectional Technologies | 22 | Active |
| US6526849B1 | Negative deflection flexible meshing type gear device having passing tooth profile with maximized tooth height | Emerging Cross-Sectional Technologies | 21 | Expired |
| US5295925A | Planetary gear transmission | Mechanical Engineering; Lighting; Heating | 20 | Expired |
| US7034425B2 | Hybrid synchronous electric machine | Electricity | 19 | Expired |
| US7823475B2 | Sealed worm gear type finger joint unit | Emerging Cross-Sectional Technologies | 19 | Active |
| US5715732A | Harmonic flexible meshing gear device | Emerging Cross-Sectional Technologies | 19 | Expired |
| US8191439B2 | Wave-gear-type linear-actuation mechanism | Emerging Cross-Sectional Technologies | 17 | Active |
| US6119553A | Rotation transmitting device | Emerging Cross-Sectional Technologies | 17 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.