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| Patents for Robert W. Gardner | |||||
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| Number | Date | Patentee | Title | Type | |
| 51,037 | Nov. 21, 1865 | R.W. Gardner | Governor Valve | steam engine governors | |
| 182,816 | Oct. 03, 1876 | R.W. Gardner | Governors for Steam Engines | steam engine governors | |
| 287,822 | Nov. 06, 1883 | R.W. Gardner | Governor | steam engine governors | |
| 300,705 | Jun. 17, 1884 | J.W. Gardner, R.W. Gardner | Governor | steam engine governors | |