| Patents Granted on 1813-04-__ |
Patents 1 -
9
of 9
      |
| Number | Date | Patentee | Title | Type |
| 1,907X | Apr. 05, 1813 | S. Parker | Machine for splitting and shaving leather | splitting and shearing machinery |
| 1,908X | Apr. 08, 1813 | W. Dunn | Mode of preparing magnesia | |
| 1,909X | Apr. 10, 1813 | J.D. Russell | Steam engines | steam engines |
| 1,910X | Apr. 15, 1813 | D. Cram | Machine for cutting timber | other wood sawing machines |
| 1,911X | Apr. 15, 1813 | G. Biddis, T. Norton | Carding, spinning and roping machine | cloth carding machines |
| 1,912X | Apr. 16, 1813 | R. Reeve, M. Reeve | Machine for cutting and heading nails | nail making machines |
| 1,913X | Apr. 29, 1813 | J.F. Hummel | Varnish of elastic gum to render water-proof, and for many other uses | |
| 1,914X | Apr. 29, 1813 | R.V. Thorn | Press for hay | hay or straw presses |
| 1,915X | Apr. 30, 1813 | S. DeWitt | Art of drawing in perspective mechanically | |
