| All Patents of Type: twist drill bits |
Patents 1 -
15
of 20
      |
| Number | Date | Patentee | Title | Type |
| 6,088 | Feb. 06, 1849 | H. Peeler | Improved Method of Boring Gun-Barrels | twist drill bits |
| 38,119 | Apr. 07, 1863 | S.A. Morse | Twist Drill Bit | twist drill bits |
| 97,818 | Dec. 14, 1869 | S. Scholfield | Improvement in Twist-Drills | twist drill bits |
| 112,115 | Feb. 28, 1871 | T.V. Boyden | Twist Drill Bit | twist drill bits |
| 118,178 | Aug. 22, 1871 | B. Arnold | Improvement in Twist-Drills | twist drill bits |
| 164,999 | Jun. 29, 1875 | G.L. Holt | Twist Drill for Wood | twist drill bits |
| 183,798 | Oct. 31, 1876 | A.F. Champlin | Improvement in Tools for Sharpening Drills | bench or pedestal grinders |
| 189,265 | Apr. 03, 1877 | J.C. Richardson | Improvement in Gimlets and Twist-Drills | making drills and augers |
| 228,421 | Jun. 01, 1880 | L. Thuston | "Brad-Point" Bit | twist drill bits |
| 245,106 | Aug. 02, 1881 | M.S. Weller | Tapered Twist Drill Bit | twist drill bits |
| 318,322 | May 19, 1885 | W.E. Taft | Machine for Making Drill-Blanks | making drills and augers |
| 326,297 | Sep. 15, 1885 | W.B. Kennedy | Combination-Tool | combination tools |
| 341,084 | May 04, 1886 | F.E. Whitney | Manufacture of Twist-Drills | making drills and augers |
| 381,092 | Apr. 10, 1888 | J. Swan | Machine for Grooving Bit-Blanks | making drills and augers |
| 430,299 | Jun. 17, 1890 | J.R. Rand | Center Boring and Marking Tool | twist drill bits |
