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===401 to 500===
This period includes patents for electrical distribution circuits and methods as well as patents for the ore refining business Edison was embarking on.<ref>Robert L. Bradley, Jr., Edison to Enron: Energy Markets and Political Strategies, John Wiley & Sons - 2011, pages 28-29</ref> He also continued to patent improvements in telegraphy, phonography, and lighting. [[Arthur Edwin Kennelly]] contributed to a variety of Edison's endeavors undertaken to create a unique product or service from 1887 to 1893{{citation needed|date=March 2013}}.

# '''{{US patent|0328,572}}''' – Commutator for Dynamo-Electric Machines (1885)
# '''{{US patent|0328,573}}''' – System of Electric Lighting
# '''{{US patent|0328,574}}''' – System of Electric Lighting
# '''{{US patent|0328,575}}''' – System of Electric Lighting
# '''{{US patent|0329,030}}''' – Telephone
# '''{{US patent|0333,289}}''' – Telegraphy
# '''{{US patent|0333,290}}''' – Duplex Telegraphy
# '''{{US patent|0333,291}}''' – Way-Station [[Quadruplex telegraph|Quadruplex Telegraphy]]
# '''{{US patent|0334,853}}''' – Mold for Carbonizing
# '''{{US patent|0337,254}}''' – Telephone
# '''{{US patent|0339,278}}''' – Electric Railway
# '''{{US patent|0339,279}}''' – System of Electrical Distribution
# '''{{US patent|0340,707}}''' – Telephonic Repeater
# '''{{US patent|0340,708}}''' – Electrical Signaling Apparatus
# '''{{US patent|0340,709}}''' – Telephone-Circuit
# '''{{US patent|0341,644}}''' – Incandescent Electric Lamp
# '''{{US patent|0341,839}}''' – Incandescing Electric Lamp
# '''{{US patent|0343,017}}''' – System of Electrical Distribution
# '''{{US patent|0347,097}}''' – Electrical Signaling Apparatus
# '''{{US patent|0348,114}}''' – Electrode for Telephone-Transmitters
# '''{{US patent|0350,234}}''' – System of Railway Signaling
# '''{{US patent|0350,235}}''' – Railway-Telegraphy
# '''{{US patent|0351,855}}''' – Electric Lamp
# '''{{US patent|0351,856}}''' – Incandescent Electric Lamp
# '''{{US patent|0353,783}}''' – Incandescent Electric Lamp
# '''{{US patent|0354,310}}''' – Manufacture of Carbon Conductors
# '''{{US patent|0358,599}}''' – Incandescent Electric Lamp
# '''{{US patent|0358,600}}''' – Incandescing Electric Lamp
# '''{{US patent|0365,465}}''' – Valve-Gear
# '''{{US patent|0365,509}}''' – Filament for Incandescent Electric Lamps
# '''{{US patent|0365,978}}''' – System of Electrical Distribution
# '''{{US patent|0369,280}}''' – System of Electrical Distribution
# '''{{US patent|0369,439}}''' – System of Electrical Distribution
# '''{{US patent|0369,441}}''' – System of Electrical Distribution
# '''{{US patent|0369,442}}''' – System of Electrical Distribution
# '''{{US patent|0369,443}}''' – System of Electrical Distribution
# '''{{US patent|0370,123}}''' – Electric Meter
# '''{{US patent|0370,124}}''' – Manufacture of Filaments for Incandescing Electric Lights
# '''{{US patent|0370,125}}''' – Electrical Transmission of Power
# '''{{US patent|0370,126}}''' – Electrical Transmission of Power
# '''{{US patent|0370,127}}''' – Electrical Transmission of Power
# '''{{US patent|0370,128}}''' – Electrical Transmission of Power
# '''{{US patent|0370,129}}''' – Electrical Transmission of Power
# '''{{US patent|0370,130}}''' – Electrical Transmission of Power
# '''{{US patent|0370,131}}''' – Electrical Transmission of Power
# '''{{US patent|0370,132}}''' – Telegraphy
# '''{{US patent|0373,584}}''' – Dynamo-Electric Machine : Includes an extra coil and utilizes a [[Force field (physics)|field of force]].
# '''{{US patent|0377,374}}''' – Telegraphy
# '''{{US patent|0377,518}}''' – Magnetic Separator
# '''{{US patent|0378,044}}''' – Telephone-Transmitter
# '''{{US patent|0379,770}}''' – Incandescent Electric Lamp
# '''{{US patent|0379,771}}''' – Regulator for Dynamo-Electric Machines
# '''{{US patent|0379,772}}''' – System of Electrical Distribution
# '''{{US patent|0379,944}}''' – Commutator for Dynamo-Electric Machines
# '''{{US patent|0380,100}}''' – Pyromagnetic Motor
# '''{{US patent|0380,101}}''' – System of Electrical Distribution
# '''{{US patent|0380,102}}''' – System of Electrical Distribution
# '''{{US patent|0382,414}}''' – Burnishing Attachment for Phonographs
# '''{{US patent|0382,415}}''' – System of Electrical Distribution
# '''{{US patent|0382,416}}''' – Feed and Return Mechanism for Phonographs
# '''{{US patent|0382,417}}''' – Process of Making Phonogram-Blanks
# '''{{US patent|0382,418}}''' – Phonogram-Blank
# '''{{US patent|0382,419}}''' – Process of Duplicating Phonograms
# '''{{US patent|0382,462}}''' – Phonogram-Blank
# '''{{US patent|0384,830}}''' – Railway Signaling
# '''{{US patent|0385,173}}''' – System of Electrical Distribution
# '''{{US patent|0386,974}}''' – Phonograph
# '''{{US patent|0389,369}}''' – Incandescing Electric Lamp
# '''{{US patent|0390,462}}''' – Process of Making Carbon Filaments
# '''{{US patent|0391,595}}''' – System of Electric Lighting
# '''{{US patent|0391,596}}''' – Incandescent Electric Lamp
# '''{{US patent|0393,462}}''' – Process of Making Phonogram-Blanks
# '''{{US patent|0393,463}}''' – Machine for Making Phonogram-Blanks
# '''{{US patent|0393,464}}''' – Machine for Making Phonogram-Blanks
# '''{{US patent|0393,465}}''' – Method of Preparing Phonograph Recording-Surfaces
# '''{{US patent|0393,466}}''' – Phonograph-Recorder
# '''{{US patent|0393,966}}''' – Method of Recording and Reproducing Sounds
# '''{{US patent|0393,967}}''' – Method of Recording and Reproducing Sounds
# '''{{US patent|0393,968}}''' – Phonograph-Recorder
# '''{{US patent|0394,105}}''' – Phonograph-Recorder
# '''{{US patent|0394,106}}''' – Phonograph-Reproducer
# '''{{US patent|0395,123}}''' – Circuit-Controller for Dynamo-Electric Machines
# '''{{US patent|0395,962}}''' – Method of Manufacturing Electric Lamps
# '''{{US patent|0395,963}}''' – Incandescent-Lamp Filament
# '''{{US patent|0396,356}}''' – Magnetic Separator
# '''{{US patent|0397,280}}''' – Phonograph Recorder and Reproducer
# '''{{US patent|0397,705}}''' – Method of Winding Field-Magnets
# '''{{US patent|0397,706}}''' – Phonograph
# '''{{US patent|0398,774}}''' – Incandescent Electric Lamp
# '''{{US patent|0400,317}}''' – Ore-Separator
# '''{{US patent|0400,646}}''' – Phonograph Recorder and Reproducer
# '''{{US patent|0400,647}}''' – Phonograph
# '''{{US patent|0400,648}}''' – Phonogram-Blank
# '''{{US patent|0400,649}}''' – Method of Making Phonogram-Blanks
# '''{{US patent|0400,650}}''' – Method of Making Phonogram-Blanks
# '''{{US patent|0401,486}}''' – System of Electric Lighting
# '''{{US patent|0401,646}}''' – Incandescing Electric Lamp
# '''{{US patent|0404,902}}''' – Electrical-Distribution System
# '''{{US patent|0406,130}}''' – Manufacture of Incandescent Electric Lamps
# '''{{US patent|0406,567}}''' – Telephone