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| Patents Granted on 1838-04-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| AI6 | Apr. 21, 1838 | T.H. Hoskings | Mortising machine | mortising machines | |
| 699 | Apr. 21, 1838 | D.C. Stone | Machine for manufacturing axes | tool making machines | |
| 700 | Apr. 21, 1838 | J.C. Yates | Sawmill without saw-gate | reciprocating sawmills | |