| Patents for Henry L. Pratt |
Patents 1 -
12
of 12
      |
| Number | Date | Patentee | Title | Type |
| 60,207 | Dec. 04, 1866 | H.C. Lewis | Improved Countersink Bit | countersinks |
| 90,759 | Jun. 01, 1869 | H.C. Lewis | Single Twist Auger Bit | auger bits |
| 131,829 | Oct. 01, 1872 | H.L. Pratt | Improvement in bit-stocks | brace chucks |
| D8,381 | Jun. 08, 1875 | H.L. Pratt | Design for Bracket Saw Frames | frame saws |
| 177,659 | May 23, 1876 | H.L. Pratt | Improvement in Scroll Saw Frames | coping saws |
| 194,109 | Aug. 14, 1877 | H.L. Pratt | Improvement in Drill-Chucks | drill chucks |
| 200,757 | Feb. 26, 1878 | H.L. Pratt | Improvement in ratchet bit-braces | ratchet braces |
| RE8,525 | Dec. 17, 1878 | H.L. Pratt | Improvement in bit-stocks | brace chucks |
| 292,176 | Jan. 22, 1884 | H.L. Pratt | Saw fastening and frame | hacksaws |
| 345,256 | Jul. 06, 1886 | H.L. Pratt | Saw Frame | hacksaws |
| 438,860 | Oct. 21, 1890 | H.L. Pratt | Auger-Handle | auger handles |
| 502,996 | Aug. 08, 1893 | H.L. Pratt | Hack-saw machine | metal sawing machines |
