| Patents Granted on 1812-04-__ |
Patents 1 -
15
of 24
      |
| Number | Date | Patentee | Title | Type |
| 1,697X | Apr. 01, 1812 | J. McDonald | Brick machine | brick and tile making machines |
| 1,699X | Apr. 01, 1812 | W. Dunn | Preparing magnesia | |
| FX-1,706 | Apr. 01, 1812 | I. Jennings | Suction pump and fire engine | fire engine pumps |
| 1,700X | Apr. 02, 1812 | E. Clark | Scow | |
| 1,701X | Apr. 02, 1812 | J. Zwisler | Making candles with tallow and wax | |
| 1,702X | Apr. 03, 1812 | J. Davidson | Horizontal churn | churns |
| 1,703X | Apr. 08, 1812 | J. Eagles, J. Vanderpool | Tobacco spinning and turning off wheel | |
| 1,704X | Apr. 08, 1812 | S. Morey | Mode of obtaining power between the difference of a column of rarified and unrarified air | |
| 1,705X | Apr. 08, 1812 | N. Gillet, J. Smith | Boring machine | drilling and boring |
| 1,706X | Apr. 11, 1812 | A. Paxton, C. Hesser | Cutting files | files |
| 1,707X | Apr. 20, 1812 | L. Anderson | Cutting files | files |
| 1,708X | Apr. 22, 1812 | Z. Kelley | Machine for cutting mitres | miter machines |
| 1,709X | Apr. 23, 1812 | B. Conner | Construction of bridges | |
| 1,710X | Apr. 25, 1812 | J. Evelett | Propelling boats by steam called the setting float steam boat | steamboats |
| 1,711X | Apr. 25, 1812 | C. Jenks | Quilted clothing for a copper still head | |
