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| Patents Granted on 1844-03-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,494 | Mar. 20, 1844 | J.K. Mayo | Manner of applying circular saws for sawing lumber, &c. | circular sawmills | |
| 3,495 | Mar. 20, 1844 | W. Wood | Machine for cutting shingles | shingle machines | |
| 3,497 | Mar. 20, 1844 | L. Whitman, E. Whitman, Jr. | Threshing-machine | threshers and thrashers | |