PORTESCAP
38Patents
0Active
38Granted
36Portfolio score
Filing activity: Sep 5, 1973 → Feb 29, 1996
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4658166A | Synchronous electric motor with disc-shaped permanent magnet rotor | Electricity | 52 | Expired |
| US4682067A | Synchronous electric motor having a disc-shaped permanent magnet rotor | Electricity | 30 | Expired |
| US5763874A | Incremental optical encoder having partially opaqued quadrature detectors | Physics | 29 | Expired |
| US4323805A | Direct current micromotor | Electricity | 19 | Expired |
| US4517478A | Electric stepper motor | Electricity | 17 | Expired |
| US4629916A | Method and apparatus for harmonics suppression in motor systems | Electricity | 14 | Expired |
| US4823040A | Single-stage, two-phase of four-phase synchronous electric motor | Electricity | 13 | Expired |
| US4714854A | Electric motor with a multipolar permanent magnet rotor | Electricity | 13 | Expired |
| US4518883A | Electric motor with permanent magnet rotor | Electricity | 12 | Expired |
| US4208868A | Control device for a step-by-step motor | Physics | 11 | Expired |
| US5053667A | Di- or polyphase synchronous electric motor with a disc-shaped rotor | Electricity | 10 | Expired |
| US4415845A | Electric motor control device | Physics | 9 | Expired |
| US4737753A | Multipolar magnetization device | Electricity | 9 | Expired |
| US4866323A | Synchronous electric motor with magnetised rotor and method of manufacturing this motor | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4155018A | Multipolar step motor | Electricity | 8 | Expired |
| US4891538A | Synchronous motor with sinusodial torque variation in each phase | Electricity | 7 | Expired |
| US4082970A | Direct-current motor-generator | Electricity | 7 | Expired |
| US4242623A | Miniature electric stepping motor | Physics | 6 | Expired |
| US4219825A | Electric actuating device | Physics | 6 | Expired |
| US4387312A | Stepping polyphased motor for a clockwork mechanism | Electricity | 6 | Expired |
| US4136294A | Direct-current micromotor | Electricity | 6 | Expired |
| US4083222A | Apparatus for measuring the rate of a watch | Electricity | 6 | Expired |
| US4791331A | Brush assembly for electric commutator motors | Electricity | 6 | Expired |
| US4516064A | Stepper motor control device | Physics | 5 | Expired |
| US4060746A | Electric direct current rotating machine | Electricity | 5 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.