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| Patents Granted on 1851-03-?? | |||||
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| Number | Date | Patentee | Title | Type | |
| 7,964 | Mar. 04, 1851 | H. Waterman | Variable Cut-Off Regulated by the Governor | steam engine governors | |
| 7,965 | Mar. 11, 1851 | L. Briggs, Jr. | Method of Adjusting the Stroke of Trip-Hammers | trip and helve hammers | |
| 7,977 | Mar. 11, 1851 | T.R. Way, M. Way | Machine for turning, boring, &c. | carriage maker | |
| 7,978 | Mar. 11, 1851 | A.A. Wilder | Copying-press | ||
| 7,979 | Mar. 11, 1851 | G.F. Woolston | Teeth of saws | saw teeth | |
| 8,000 | Mar. 25, 1851 | N. Lamson | Scythe | ||