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PORTESCAP
CH38 patents
Top patents by PatentIndex Score
US4658166AApr 14, 1987
Synchronous electric motor with disc-shaped permanent magnet rotor
PORTESCAP87 citations96
US4682067AJul 21, 1987
Synchronous electric motor having a disc-shaped permanent magnet rotor
PORTESCAP39 citations93
US5763874AJun 9, 1998
Incremental optical encoder having partially opaqued quadrature detectors
PORTESCAP40 citations88
US5053667AOct 1, 1991
Di- or polyphase synchronous electric motor with a disc-shaped rotor
PORTESCAP20 citations82
US4629916ADec 16, 1986
Method and apparatus for harmonics suppression in motor systems
PORTESCAP20 citations82
US4518883AMay 21, 1985
Electric motor with permanent magnet rotor
PORTESCAP17 citations82
US4517478AMay 14, 1985
Electric stepper motor
PORTESCAP23 citations82
US4891538AJan 2, 1990
Synchronous motor with sinusodial torque variation in each phase
PORTESCAP10 citations74
US4823040AApr 18, 1989
Single-stage, two-phase of four-phase synchronous electric motor
PORTESCAP19 citations74
US4737753AApr 12, 1988
Multipolar magnetization device
PORTESCAP12 citations74
US4714854ADec 22, 1987
Electric motor with a multipolar permanent magnet rotor
PORTESCAP19 citations74
US4707677ANov 17, 1987
Multipolar magnetization device
PORTESCAP8 citations74
US4415845ANov 15, 1983
Electric motor control device
PORTESCAP9 citations74
US4387312AJun 7, 1983
Stepping polyphased motor for a clockwork mechanism
PORTESCAP12 citations74
US4155018AMay 15, 1979
Multipolar step motor
PORTESCAP9 citations74
US4323805AApr 6, 1982
Direct current micromotor
PORTESCAP28 citations73
US4242623ADec 30, 1980
Miniature electric stepping motor
PORTESCAP8 citations73
US4543507ASep 24, 1985
Self-supporting rotor coil for dc-machine
PORTESCAP8 citations72
US4219825AAug 26, 1980
Electric actuating device
PORTESCAP7 citations72
US4060746ANov 29, 1977
Electric direct current rotating machine
PORTESCAP8 citations72
US5194787AMar 16, 1993
Control circuit for an electric motor without a collector
PORTESCAP8 citations71
US4516064AMay 7, 1985
Stepper motor control device
PORTESCAP11 citations70
US4208868AJun 24, 1980
Control device for a step-by-step motor
PORTESCAP12 citations70
US4866323ASep 12, 1989
Synchronous electric motor with magnetised rotor and method of manufacturing this motor
PORTESCAP14 citations68
US4791331ADec 13, 1988
Brush assembly for electric commutator motors
PORTESCAP7 citations68
US4136294AJan 23, 1979
Direct-current micromotor
PORTESCAP7 citations68
US4082970AApr 4, 1978
Direct-current motor-generator
PORTESCAP11 citations68
US4908592AMar 13, 1990
Electromagnetic actuating device
PORTESCAP5 citations63
US4337449AJun 29, 1982
Magnetic transducer with a movable magnet
PORTESCAP3 citations63
US4012941AMar 22, 1977
Method of and apparatus for measuring the amplitude of oscillation of the balance of a timepiece movement
PORTESCAP7 citations63
US4084502AApr 18, 1978
Electric acutating device
PORTESCAP4 citations61
US4079279AMar 14, 1978
Electrical micromotor
PORTESCAP5 citations59
US4083222AApr 11, 1978
Apparatus for measuring the rate of a watch
PORTESCAP8 citations58
US4335596AJun 22, 1982
Device for measuring the operation of a timepiece movement
PORTESCAP5 citations53
US3941439AMar 2, 1976
Shock absorber bearing assembly
PORTESCAP2 citations53
US4203281AMay 20, 1980
Assembly comprising a timepiece pallet anchor and its frame
PORTESCAP6 citations51
US5003686AApr 2, 1991
Method of manufacturing a synchronous electric motor with magnetized rotar
PORTESCAP1 citations46
US4521723AJun 4, 1985
Method and device for braking an assembly comprising a two-phase synchronous motor
PORTESCAP1 citations33