| Patents Granted on 1820-10-?? |
Patents 1 -
10
of 10
      |
| Number | Date | Patentee | Title | Type |
| 3,236X | Oct. 02, 1820 | J. Prince (Priner) | Wheel for propelling boats | nautical propulsion apparatus |
| 3,237X | Oct. 02, 1820 | D. Evans | Knapping hats with rabbits' fur | |
| 3,238X | Oct. 03, 1820 | A. Ramsey | Improvement on the common sewer mouth | |
| 3,239X | Oct. 04, 1820 | E. Hubball (Hubbell) | Improvement in common cocks | |
| 3,240X | Oct. 04, 1820 | W. Bald, Jr. | Machine for spinning cotton | spinner |
| 3,241X | Oct. 10, 1820 | D. Beauchamp | Water wheel | water wheels |
| 3,242X | Oct. 13, 1820 | R. French | Machine for cleaning rice | miller |
| 3,243X | Oct. 28, 1820 | W. Gilmour | Power loom | looms |
| 3,244X | Oct. 31, 1820 | N. Sears | Machine for breaking bark etc. | bark processing machines |
| 3,245X | Oct. 31, 1820 | D. Pease, Jr. | Smut machine | miller |
