| Patents Granted on 1803-04-?? |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 441X | Apr. 04, 1803 | T.H. Rawson | Antibilious pills | medical pills and syrups |
| 442X | Apr. 04, 1803 | J. Richardson | Improvement in his evaporating furnace | industrial furnaces |
| 443X | Apr. 06, 1803 | W. How | Improvement in a Cooler or Condensor of Vapor | distilling |
| 444X | Apr. 11, 1803 | J. Stevens | Improvement in producing steam | stationary boilers |
| 445X | Apr. 22, 1803 | D. Brewer | Ruling Machine | ruling machines |
| 446X | Apr. 27, 1803 | B. Platt | Improvement in Heating and Boiling Water | water and plumbing |
| 447X | Apr. 27, 1803 | E. Beebe | Mode of Constructing Vessels with Crooked Keels | shipwright |
