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| Patents for George A. Coffin | |||||
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| Number | Date | Patentee | Title | Type | |
| 302,554 | Jul. 29, 1884 | W.K. Freeman | Armature for Dynamo Electric Machines or Motors | electric motors | |
| 302,555 | Jul. 29, 1884 | W.K. Freeman | Armature for Dynamo Electric Machines or Motors | electric motors | |
| 302,556 | Jul. 29, 1884 | W.K. Freeman | Field of Force Magnet for Dynamo Electric Machines | electric generators | |
| 302,557 | Jul. 29, 1884 | W.K. Freeman | Armature Winding for Dynamo Machines | electric generators | |