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| Patents Granted on 1838-04-28 | |||||
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| Number | Date | Patentee | Title | Type | |
| 714 | Apr. 28, 1838 | J. Secor | Horse Power | animal powered apparatus | |
| 715 | Apr. 28, 1838 | J. Mumma | Water Wheel | water wheels | |
| 716 | Apr. 28, 1838 | H. Barnes | Machine for mortising and tenoning timber, &c. | mortising machines | |
| 717 | Apr. 28, 1838 | J. Secor | Sawmill for sawing timber | reciprocating sawmills | |
| 718 | Apr. 28, 1838 | J.M. Spooner | Broom Machine | broom making machinery | |
| 719 | Apr. 28, 1838 | J.G. Pike | Churn | churns | |