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| Patents Granted on 1838-05-?? | |||||
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| Number | Date | Patentee | Title | Type | |
| 724 | May 04, 1838 | W. Mason | Speeder for Roving Cotton | ||
| 730 | May 08, 1838 | G. Page | Hand drill | breast drills | |
| 735 | May 10, 1838 | R. Porter | Churn | churns | |
| 752 | May 30, 1838 | J. Andrews | Machine for mortising timber, &c. | mortising machines | |
| 755 | May 30, 1838 | H. Thurber | Sawmill-dog | sawmill carriages | |
| 758 | May 30, 1838 | S. Kimball | Mode of Appying Friction to the Yarn-Beams of Power-Looms | looms | |