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| Patents for Dexter D. Hardy | |||||
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| Picture | Number | Date | Patentee | Title | |
| 24,388 | Jun. 14, 1859 | D.D. Hardy | Rotary Steam Engine | ||
 | 77,373 | Apr. 28, 1868 | D.D. Hardy | Rotary Engine | |
| 141,436 | Aug. 05, 1873 | D.D. Hardy | Rotary Steam-Engines | ||
 | 163,486 | May 18, 1875 | F.D. Hardy | Improvement in Car Starters | |
| 313,728 | Mar. 10, 1885 | D.D. Hardy | Steam Engine | ||
| 313,729 | Mar. 10, 1885 | D.D. Hardy | Steam Engine Valve | ||
| 313,730 | Mar. 10, 1885 | D.D. Hardy | Multiple Cylinder Engine | ||
| 434,561 | Aug. 19, 1890 | D.D. Hardy | Steam Engine | ||