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| Patents Granted on 1840-05-?? | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,617 | May 25, 1840 | G. Page | Improvement in seed-planting machines | crop planters | |
| 1,619 | May 25, 1840 | R. Porter | Improvement in life-preservers or buoyant dresses | life preservers | |
| 1,620 | May 25, 1840 | A.L. Pennock, J. Sellers | Improvement in the Clasps of Carpet-Bags | clasps and fastenings | |