Japan Servo Co., Ltd.
161Patents
14Active
161Granted
43Portfolio score
Filing activity: Mar 15, 1974 → Jul 24, 2007 · 14 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6335582B1 | Permanent-magnet revolving electrodynamic machine with a concentrated winding stator | Electricity | 65 | Expired |
| US5874795A | Multi-phase permanent-magnet type electric rotating machine | Electricity | 63 | Expired |
| US6179569A | Liquid transportation apparatus | Human Necessities | 55 | Expired |
| US5386161A | Permanent magnet stepping motor | Electricity | 54 | Expired |
| US5410200A | Hybrid type stepping motor | Electricity | 46 | Expired |
| US6153953A | Multi-phase PM-type stepping motor | Electricity | 45 | Expired |
| US5532531A | Permanent magnet type brushless motor | Electricity | 44 | Expired |
| US5128570A | Permanent magnet type stepping motor | Electricity | 43 | Expired |
| US5652606A | Message card | Emerging Cross-Sectional Technologies | 43 | Expired |
| US5854526A | Three-phase permanent-magnet electric rotating machine | Electricity | 40 | Expired |
| US4109170A | Electric motor having frequency generator | Physics | 38 | Expired |
| US4983867A | Hybrid-type stepping motor | Electricity | 37 | Expired |
| US6313558A | Electric rotary machine having concentrated winding stator | Electricity | 35 | Expired |
| US7242118B2 | Toroidal-coil linear stepping motor, toroidal-coil linear reciprocating motor, cylinder compressor and cylinder pump using these motors | Electricity | 35 | Expired |
| US6605883B2 | Multi-phase flat-type PM stepping motor and driving circuit thereof | Electricity | 34 | Expired |
| US5289064A | Three-phase permanent magnet stepping motor | Electricity | 34 | Expired |
| US6121712A | Three-phase permanent magnet cascade claw type stepping motor | Electricity | 34 | Expired |
| US4503368A | Permanent magnet type stepping motor | Electricity | 34 | Expired |
| USD564653S1 | Propeller for an axial flow fan | General | 33 | Expired |
| US6028377A | Three-phase permanent magnet cascade claw type stepping motor | Electricity | 33 | Expired |
| US6703803B2 | Fan motor driving circuit | Emerging Cross-Sectional Technologies | 33 | Expired |
| US6575936B1 | Liquid infusion apparatus | Human Necessities | 31 | Expired |
| US5964576A | Impeller of centrifugal fan | Mechanical Engineering; Lighting; Heating | 31 | Expired |
| US5708310A | Permanent magnet type stepping motor | Electricity | 30 | Expired |
| US6765321B2 | Three-phase toroidal coil type permanent magnet electric rotating machine | Electricity | 30 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.