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| Patents for Economic Motor Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 284,555 | Sep. 04, 1883 | G.M. Hopkins | Gas Engine | |
 | 284,556 | Sep. 04, 1883 | G.M. Hopkins | Gas Engine | |
 | 284,557 | Sep. 04, 1883 | G.M. Hopkins | Gas Engine | |
 | 284,851 | Sep. 11, 1883 | I.N. Hopkins, G.M. Hopkins | Gas Engine | |
| 388,873 | Sep. 04, 1888 | G.M. Hopkins | Steam Generator | ||