| Patents Granted on 1840-__-__ |
Patents 1 -
15
of 65
      |
| Number | Date | Patentee | Title | Type |
| 1,475 | Jan. 18, 1840 | C.E. Warner | Machine for turning wooden boxes | box making machines |
| NS-7 | Jan. 25, 1840 | R. Corbet | Method of preventing chimneys from smoking | chimneys |
| 1,486 | Feb. 08, 1840 | S. Morrill, E. Moody | Self-tending sawmill | sawmill carriages |
| 1,491 | Feb. 18, 1840 | I. Straub | Portable grist-mill | grist mills |
| 1,493 | Feb. 18, 1840 | W.R. Greenleaf, A. Cole | Machine for cutting veneers | veneer machines |
| 1,522 | Mar. 25, 1840 | G.W. Lawton, B.D. Whitney | Machine for stretching cloth in the process of fulling | felt making machines |
| 1,527 | Mar. 31, 1840 | W. Bryant | Improvement in Plows | plows |
| 1,553 | Apr. 15, 1840 | W. Field | Manner of Manufacturing Screw-Augers | making drills and augers |
| 1,617 | May 25, 1840 | G. Page | Improvement in seed-planting machines | crop planters |
| 1,620 | May 25, 1840 | A.L. Pennock, J. Sellers | Improvement in the Clasps of Carpet-Bags | clasps and fastenings |
| NS-8 | Jun. 13, 1840 | R.H. Smith, T. Smith | Machine for blowing blacksmiths' bellows by water power | forge bellows |
| 1,647 | Jun. 20, 1840 | S.F. Morse | Electric telegraph | telegraphy apparatus |
| 1,648 | Jun. 20, 1840 | A. Crowell, W.A. Crowell | Construction of Churns | churns |
| 1,649 | Jun. 20, 1840 | A. Bailey | Mortising and tenoning machine | mortising machines |
| 1,652 | Jun. 27, 1840 | J. Hamilton | Pit-sawing and slitting machine for sawing logs into lumber and boards | reciprocating sawmills |
