| Patents Granted on 1831-04-23 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 6,512X | Apr. 23, 1831 | J. Barton | Cast or wrought iron spindle and cast iron driver | |
| 6,513X | Apr. 23, 1831 | C.W. Cook | Woollen dressing cloths | dressing cloth |
| 6,514X | Apr. 23, 1831 | D. Harrington | Machine for exercising invalids in their rooms | chairs |
| 6,515X | Apr. 23, 1831 | W. Howard | Carriage for railroads by which the flanges of the wheels are prevented from impinging on the rails | |
| 6,516X | Apr. 23, 1831 | G.B. Palmer | Machine for separating gold ore from earth | ore processing apparatus |
| 6,517X | Apr. 23, 1831 | A. Richardson | Machine for splitting leather | leatherworker |
