| Patents Granted on 1800-??-?? |
Patents 1 -
15
of 42
      |
| Number | Date | Patentee | Title | Type |
| 267X | Jan. 16, 1800 | O. Evans | Improvement on stoves and grates | stoves |
| 268X | Feb. 04, 1800 | S. Gorham | Machine for spinning rope, yarn and twine | rope maker |
| 269X | Feb. 04, 1800 | S. Constant | Composition to preserve wood, brick, etc. | carpenter |
| 270X | Feb. 04, 1800 | J.G. Gebhard | Extracting oil from palma christi | purifying oil |
| 271X | Feb. 07, 1800 | B. Bolitho | Machine for pounding rice, gunpowder, etc. | miller |
| 272X | Feb. 07, 1800 | W. Shotwell | Metal Boxes for Wood or Iron to TurnI In | wheelwright |
| 273X | Feb. 12, 1800 | J.J. Hawkins | Improvement in piano fortes | music instrument maker |
| 274X | Feb. 12, 1800 | H. Killey, II | Method of Covering Salt Vats from the Weather | salt making apparatus |
| 275X | Feb. 12, 1800 | P. Lyon | Engine for throwing water | steam pumps |
| 276X | Feb. 12, 1800 | N. Ladd | Extracting Essence of Sumack, Fera, etc for Tanning | leatherworker |
| 277X | Feb. 20, 1800 | J. Cox | Raising or Lifting Hides in Tanning | leatherworker |
| 278X | Feb. 20, 1800 | B. Tyler | Grist Mill | grist mills |
| GB-180,002,378 | Feb. 28, 1800 | P. Crowther | Applying steam engine to rotative axis | |
| 279X | Mar. 03, 1800 | J. Percy | Improvement in dying blue | dyeing materials |
| 280X | Mar. 15, 1800 | W. Harris | Lathe or loom for weaving | looms |
