| Patents Granted on 1820-07-?? |
Patents 1 -
9
of 9
      |
| Number | Date | Patentee | Title | Type |
| 3,212X | Jul. 05, 1820 | E. Hall (Hale) | Water wheel | water wheels |
| 3,213X | Jul. 06, 1820 | D. Tomlinson | Currying Knife | currying knives |
| 3,214X | Jul. 06, 1820 | J.W. Jenkins | Ploughs | plows |
| 3,215X | Jul. 11, 1820 | C. Redheffer | Gaining power by cog wheels, etc. | |
| 3,216X | Jul. 18, 1820 | D. Fisk | Balance lever hydraulic machine | |
| 3,217X | Jul. 20, 1820 | B. Simmons | Linen spinning wheel | spinner |
| 3,218X | Jul. 28, 1820 | T. Dakin | Draw Grinding Gun Barrels | gunsmith |
| 3,219X | Jul. 28, 1820 | J.S. Wright | Plough | plows |
| 3,220X | Jul. 28, 1820 | M. Fowler (Fowler Mallby) | Machine for hulling grain and rice | miller |
