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| Patents Granted on 1842-05-30 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,652 | May 30, 1842 | S. Learned | Machine for dressing staves for barrels, casks, &c. | barrel making machines | |
| 2,654 | May 30, 1842 | W. Baker | Machine for manufacturing wood so as to be used as a substitute for curled hair in stuffing beds | excelsior machines | |
| 2,656 | May 30, 1842 | R.M. Hoe | Machinery for grinding and polishing metallic surfaces, particularly saw-plates | tool making machines | |