| Patents Granted on 1821-05-?? |
Patents 1 -
8
of 8
      |
| Number | Date | Patentee | Title | Type |
| 3,332X | May 01, 1821 | B. Langdon | Propelling horse boats | nautical propulsion apparatus |
| 3,333X | May 02, 1821 | J. Woodward | Carding machine | cloth carding machines |
| FX-3,333 | May 04, 1821 | J. Wiltse | Keel for Vessel | shipwright |
| 3,334X | May 13, 1821 | S. Rust | Printing Press | printing presses |
| 3,335X | May 14, 1821 | J.H. Deas, R. Wellford | Carpenter's planes | bench planes |
| 3,336X | May 17, 1821 | S. Belknap | Machine for making bricks | brick maker |
| 3,337X | May 23, 1821 | F. Jones | Machine for winding quills | |
| 3,338X | May 30, 1821 | J. Boyd | Fire engine hose | fire hoses |
