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All Patents in class 318/257
Patents 1 - 9 of 9
First set of recordsLast set of records
NumberDatePatenteeTitleType
295,454Mar. 18, 1884F.J. SpragueElectro Dynamic Motorelectric motors
320,630Jun. 23, 1885L. DaftElectric Switchelectric switches
321,147Jun. 30, 1885F.J. SpragueElectro Dynamic Motorelectric motors
700,310May 20, 1902R. EickemeyerAlternating-current electric motor and controlling means therefor
1,043,325Nov. 05, 1912J.C. LincolnVariable Speed Electric MotorDC motors
1,053,940Feb. 18, 1913J. BurkeUniversal motoruniversal motors
1,144,935Jun. 29, 1915A.L. De LeeuwMachine Tool Controlmachine tool controls
2,845,589Jul. 29, 1958J.H. OsgoodElectronic Table Motor Drive Unit for Optical Comparators and the Likecomparators
3,586,949Jun. 22, 1971K.D. Spear, C.F. RaberThree-Phase Motor Control Systemmotor controls
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