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| Patents Granted on 1857-07-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| AI172 | Jul. 21, 1857 | J.L. Rolland | Kneading | ||
| 17,829 | Jul. 21, 1857 | W.M. Ferry, Jr. | Circular sawmill | circular sawmills | |
| 17,833 | Jul. 21, 1857 | J. Hall | Feed-roller for planing machines, &c. | wood planers | |
| 17,840 | Jul. 21, 1857 | F.B. Kendall | Sawing-mill | reciprocating sawmills | |
| 17,844 | Jul. 21, 1857 | G.B. Phillips | Hand-Wrench | quick adjust wrenches | |
| 17,846 | Jul. 21, 1857 | A. Rickart | Method of turning carriage-hubs | wood lathes | |