| Patents Granted on 1851-04-__ |
Patents 1 -
11
of 11
      |
| Number | Date | Patentee | Title | Type |
| 8,012 | Apr. 01, 1851 | J. Walker | Lock Former | tinsmith |
| 8,017 | Apr. 01, 1851 | H. Mellish | Splint-machine | match making machines |
| 8,019 | Apr. 01, 1851 | W. Campbell, H. Gross | Improvement in Machines for Cutting Screws on Bedstead-Rails | wood threading machines |
| 8,022 | Apr. 08, 1851 | P. Crosby | Sawing machine | circular sawmills |
| 8,032 | Apr. 08, 1851 | H. Strait | Saw-set | saw sets |
| 8,036 | Apr. 15, 1851 | J.H. Baird, J. Buckingham | Milling Tool | lathe tools |
| 8,042 | Apr. 15, 1851 | J.W. Robbins | Setting logs in sawmills | sawmills |
| 8,056 | Apr. 22, 1851 | L. Hedge | Sawmill | band sawmills |
| 8,057 | Apr. 22, 1851 | E. Whiteley | Coffee Roaster | coffee roasters |
| 8,066 | Apr. 29, 1851 | I.H. Smith | Machinery for making matches | match making machines |
| 8,069 | Apr. 29, 1851 | L.L. Gilliland | Splint-machine | match making machines |
