| Patents Granted on 1821-12-?? |
Patents 1 -
15
of 24
      |
| Number | Date | Patentee | Title | Type |
| 3,410X | Dec. 01, 1821 | T. Skidman (Skidmore) | Condensers for steam engines | steam engines |
| 3,411X | Dec. 04, 1821 | J.M. Yard | Machine for making candles | candle making machinery |
| 3,412X | Dec. 04, 1821 | J.G. Vought | Chemical anti-dysenteric medicine | |
| 3,413X | Dec. 04, 1821 | G.H. Thompson | Protractors | protractors |
| 3,414X | Dec. 05, 1821 | E. Spencer | Machine for hulling and shelling rice | miller |
| GB-182,104,622 | Dec. 05, 1821 | C. Broderip | Steam engines | steam engines |
| 3,415X | Dec. 06, 1821 | P. Williamson | Improvement in bedsteads | |
| 3,416X | Dec. 07, 1821 | B. Marshall | Machine used in the medicated steam bath | |
| 3,417X | Dec. 07, 1821 | J. Barron | Washing machine | washing machines |
| 3,418X | Dec. 07, 1821 | W. Hart | Setting saw teeth | saw sets |
| 3,419X | Dec. 11, 1821 | E. Walcott | Making cotton yarn without the aid of twist | |
| 3,420X | Dec. 11, 1821 | E. Warren | Loom | looms |
| 3,421X | Dec. 12, 1821 | S. Ballou (Ballon) | Threshing and winnowing machine | winnowing machines |
| 3,422X | Dec. 13, 1821 | N.N. Destrehan | Machine for raising water | |
| 3,423X | Dec. 13, 1821 | S. Baker | Steam boilers | stationary boilers |
