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| Patents Granted on 1840-06-27 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,652 | Jun. 27, 1840 | J. Hamilton | Pit-sawing and slitting machine for sawing logs into lumber and boards | reciprocating sawmills | |
| 1,658 | Jun. 27, 1840 | Z. Parker, R. McKelvey | Improvement in Percussion and Reaction Water Wheels | water wheels | |
| 1,659 | Jun. 27, 1840 | H.W. Hewet | Screw Wrench | nut wrenches | |
| 1,663 | Jun. 27, 1840 | J. Hamilton | Machine for sawing or cutting snags | reciprocating saws | |