ELECTRO CRAFT CORP innovation strategy

Patent filings in countries

#	Industry
#1	Electrical machinery and energy
#2	Measurement
#3	Machines
#4	Basic communication technologies
#5	Control
#6	Mechanical elements

#	Technology
#1	Dynamo-electric machines
#2	Measuring speed and acceleration
#3	Electric motor controls
#4	Unspecified technologies
#5	Special measuring
#6	Code conversion
#7	Systems controlling non-electric variables
#8	AC and DC conversion devices
#9	Emergency protective circuit arrangements
#10	Clutches and brakes

Publication	Filing date	Title
US4651068A	1984-10-01	Brushless motor control circuitry with optimum current vector control
US4498037A	1983-09-22	Velocity servo controller
EP0079985A1	1981-11-24	Flux focussed DC motor and method for assembly
US4417141A	1981-06-10	Optical shaft angle encoder
DE3008317A1	1980-03-04	High power servo amplifier for DC motor control - has two power transistors supplied with regulated base control current in dependence on control command
US4322646A	1980-02-29	Flux focussed DC motor and method for assembly
US4285595A	1979-07-27	Modular encoder
US4208621A	1978-06-30	Brushless DC motor control system
US4184071A	1978-01-12	Modular encoder
US4086519A	1977-02-25	Hall effect shaft angle position encoder
US4088943A	1977-02-25	Brushless DC tachometer circuit
DE2641812A1	1976-09-17	Pulse width modulated motor control system - has two current sources of opposite polarity, one with higher voltage than other
IT1073416B	1976-09-15	Pulse width modulated motor control system - has two current sources of opposite polarity, one with higher voltage than other
US3989992A	1975-03-10	Pulse width modulated control system
US3809983A	1972-11-08	Variable speed motor
US3753068A	1971-11-09	Controlled speed electric motor
US3709000A	1971-02-08	Coupling
US3639792A	1970-12-28	Motor-generator
US3663851A	1970-09-21	D.c. motor
US3436573A	1967-03-24	Control apparatus