| Patents Granted on 1821-04-__ |
Patents 1 -
12
of 12
      |
| Number | Date | Patentee | Title | Type |
| 3,321X | Apr. 03, 1821 | A. Rucker, N.C. Dawson | Improvement in boats for rivers | boats and ships |
| 3,322X | Apr. 05, 1821 | J. Morgan | Warping and weaving cotton goods | weaver |
| 3,323X | Apr. 07, 1821 | A.O. Stansbury (Stranbury) | Printing press | printing presses |
| NX-182,104,091 | Apr. 09, 1821 | A. Swart | Churn | churns |
| 3,324X | Apr. 14, 1821 | B.H. Latrobe, E. Blanc (Blane), Jr. | Machine for sifting lime, etc. | |
| 3,325X | Apr. 16, 1821 | D. Donoghoe | Winnowing or fanning mill for grain | winnowing machines |
| 3,326X | Apr. 18, 1821 | T. Oxley | Land clearing machine | |
| 3,327X | Apr. 19, 1821 | J.S. Stuart | Linen spinning wheel head | wheel heads |
| 3,328X | Apr. 23, 1821 | E.A. Stevens, R.L. Stevens | Cast iron ploughs | plows |
| 3,329X | Apr. 23, 1821 | E.A. Stevens, R.L. Stevens | Hardening part of the edge of the share of ploughs | plows |
| 3,330X | Apr. 25, 1821 | P. Dixon | Riding saddles | saddles |
| 3,331X | Apr. 27, 1821 | R. Blaikie | Distilling spirits | |
