All Patents of Type: slide rules |
Patents 1 -
12
of 12
|
Number | Date | Patentee | Title | Type |
2,907 | Jan. 10, 1843 | J.P. Smith | Merchant's Slide Rule | scales |
NS-13 | Jul. 12, 1851 | A. Chisholm | Mathematical mechanical scale to solve problems in trigonometry | scales |
651,142 | Jun. 05, 1900 | W.L. Keuffel | Slide Rule | slide rules |
838,696 | Dec. 18, 1906 | W.F. Doherty | Engineer's Slide Rule | slide rules |
845,463 | Feb. 26, 1907 | H.T. Hincks | Slide Rule | circular slide rules |
1,088,175 | Feb. 24, 1914 | W.O. Phillips | Slide Rule | slide rules |
1,150,771 | Aug. 17, 1915 | W.L. Keuffel | Slide rule runner | slide rules |
1,181,672 | May 02, 1916 | W.L. Keuffel | Slide rule runner | slide rules |
1,404,450 | Jan. 24, 1922 | G.A. Lofland | Direct Reading Proportional Scale | scales |
1,431,409 | Oct. 10, 1922 | W.L. Miller | Slide Rule | slide rules |
1,816,548 | Jul. 28, 1931 | L. Robidoux | Simplified Rule (Fractional markings to 64's) | scales |
1,934,232 | Nov. 07, 1933 | A.W. Keuffel | Slide rule | slide rules |