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| Patents Granted on 1819-08-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,124X | Aug. 21, 1819 | R. Bury | Glass instead of metallic strings for piano fortes | music instrument maker | |
| 3,125X | Aug. 21, 1819 | D. Pettibone | Cast steel welded to iron | blacksmith | |
| 3,126X | Aug. 21, 1819 | G. Fulton | Granulating gun powder | ||