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| Patents Granted on 1827-07-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,824X | Jul. 21, 1827 | D. Olmstead | Manufacture of gas lights from cotton seed | ||
| 4,825X | Jul. 21, 1827 | G. Hill, E. Mann | Portable crane for raising brick, etc. | cranes | |
| 4,826X | Jul. 21, 1827 | A. Coe, J. Coe | Grist mill | grist mills | |