9 Magnetic Ore Separator . . . . . . . .April 3, 1880
238,868 Manufacture of Carbons for Incandescent
Electric Lamps . . . . . . . . . . . April 25, 1880
237,732 Electric Light . . . . . . . . . . . .June 15, 1880
248,417 Manufacturing Carbons for Electric
Lights . . . . . . . . . . . . . . . .June 15, 1880
298,679 Treating Carbons for Electric Lights .June 15, 1880
248,430 Electro Magnetic Brake . . . . . . . . July 2, 1880
265,778 Electro Magnetic Railway Engine. . . . July 3, 1880
248,432 Magnetic Separator . . . . . . . . . .July 26, 1880
239,150 Electric Lamp. . . . . . . . . . . . .July 27, 1880
239,372 Testing Electric Light Carbons--Edison
and Batchelor. . . . . . . . . . . . .July 28, 1880
251,540 Carbon Electric Lamps. . . . . . . . .July 28, 1880
263,139 Manufacture of Carbons for Electric
Lamps. . . . . . . . . . . . . . . . .July 28, 1880
434,585 Telegraph Relay. . . . . . . . . . . .July 29, 1880
248 423 Carbonizer . . . . . . . . . . . . . .July 30, 1880
263 140 Dynamo Electric Machines . . . . . . .July 30, 1880
248,434 Governor for Electric Engines. . . . .July 31, 1880
239,147 System of Electric Lighting. . . . . .July 31, 1880
264,642 Electric Distribution and Translation
System . . . . . . . . . . . . . . . . Aug. 4, 1880
293,433 Insulation of Railroad Tracks used for
Electric Circuits. . . . . . . . . . . Aug. 6, 1880
239,373 Electric Lamp. . . . . . . . . . . . . Aug. 7, 1880
239,745 Electric Lamp. . . . . . . . . . . . . Aug. 7, 1880
263,135 Electric Lamp. . . . . . . . . . . . . Aug. 7, 1880
251,546 Electric Lamp. . . . . . . . . . . . .Aug. 10, 1880
239,153 Electric Lamp. . . . . . . . . . . . .Aug. 11, 1880
351,855 Electric Lamp. . . . . . . . . . . . .Aug. 11, 1880
248,435 Utilizing Electricity as Motive Power.Aug. 12, 1880
263,132 Electro Magnetic Roller. . . . . . . .Aug. 14, 1880
264,645 System of Conductors for the Distribution
of Electricity . . . . . . . . . . . .Sept. 1, 1880
240,678 Webermeter . . . . . . . . . . . . . Sept. 22, 1880
239,152 System of Electric Lighting. . . . . .Oct. 14, 1880
239,148 Treating Carbons for Electric Lights .Oct. 15, 1880
238,098 Magne