| Patents Granted on 1840-??-?? |
Patents 1 -
15
of 74
      |
| Number | Date | Patentee | Title | Type |
| AI29 | Jan. 14, 1840 | E. Finney | Lock | |
| 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 |
| AI30 | Feb. 18, 1840 | E.W. Welsh | Mill spindle oiling | |
| AI31 | Feb. 18, 1840 | D. Williams | Measuring instrument for cutting out garments | |
| 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 | B.D. Whitney, G.W. Lawton | Machine for stretching cloth in the process of fulling | felt making machines |
| 1,526 | Mar. 25, 1840 | M. Gregg | Manner of fastening bedsteads and attaching and stretching sackings | beds and bedsteads |
| 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 |
| 1,554 | Apr. 15, 1840 | R. Porter | Cheese-press | cheese press |
| 1,617 | May 25, 1840 | G. Page | Improvement in seed-planting machines | crop planters |
| 1,619 | May 25, 1840 | R. Porter | Improvement in life-preservers or buoyant dresses | life preservers |
