All Patents of Type: drill bit extensions |
Patents 1 -
15
of 26
|
Number | Date | Patentee | Title | Type |
116,090 | Jun. 20, 1871 | W.S. Pattin | Improvement in Extension-Shanks for Boring-Bits | drill bit extensions |
162,874 | May 04, 1875 | W. Wells | Auger-Bit Extension | drill bit extensions |
281,568 | Jul. 17, 1883 | C. Schoch | Extension-Shank for Bits | drill bit extensions |
315,079 | Apr. 07, 1885 | I.P. Shotts | Extension-Shank for Bits, &c. | drill bit extensions |
455,477 | Jul. 07, 1891 | J.F. Steward | Drill Bit Extension, Etc. | drill bit extensions |
698,001 | Apr. 22, 1902 | B.F. Foss | Lengthening Attachment for Bits | drill bit extensions |
759,042 | May 03, 1904 | W.B. Swan | Bit-Extender | drill bit extensions |
810,230 | Jan. 16, 1906 | W.B. Swan | Bit-Extender | drill bit extensions |
854,742 | May 28, 1907 | C.E. Hill | Adjustable extension bit holder | drill bit extensions |
890,894 | Jun. 16, 1908 | G.W. Leonard, W.H. Ehrhart | Bit-Extender | drill bit extensions |
899,203 | Sep. 22, 1908 | F.E. Carlson | Bit Extension | drill bit extensions |
929,231 | Jul. 27, 1909 | J.A. Leland | Bit Extension | drill bit extensions |
954,046 | Apr. 05, 1910 | W.A. Peck | Extension bit-holder | drill bit extensions |
1,030,592 | Jun. 25, 1912 | J.A. Leland | Telescopic Extension-Rod | drill bit extensions |
1,241,143 | Sep. 25, 1917 | H.E. Parker | Bit Brace Extension | drill bit extensions |