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| Patents Granted on 1840-06-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,647 | Jun. 20, 1840 | S.F. Morse | Electric telegraph | telegraphy apparatus | |
| 1,648 | Jun. 20, 1840 | A. Crowell, W.A. Crowell | Construction of Churns | churns | |
| 1,649 | Jun. 20, 1840 | A. Bailey | Mortising and tenoning machine | mortising machines | |