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| Patents for Robert L. Stevens | |||||
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| Picture | Number | Date | Patentee | Title | |
| 3,234X | Sep. 20, 1820 | R.L. Stevens | Plough | ||
| 3,328X | Apr. 23, 1821 | E.A. Stevens, R.L. Stevens | Cast iron ploughs | ||
| 3,329X | Apr. 23, 1821 | E.A. Stevens, R.L. Stevens | Hardening part of the edge of the share of ploughs | ||
| 4,733X | Apr. 10, 1827 | R.L. Stevens | Water wheel for steam boats | ||