| Patents for Keuffel & Esser Co. |
Patents 1 -
11
of 11
      |
| Number | Date | Patentee | Title | Type |
| 233,358 | Oct. 19, 1880 | H.H. Leistner, C.E. Leistner | Tape-measure | tape measures |
| 338,602 | Mar. 23, 1886 | W.J. Keuffel | Tape Measure Case | tape measures |
| 363,070 | May 17, 1887 | W. Keuffel | Tape Measure Case | tape measures |
| 393,290 | Nov. 20, 1888 | A.C. Both | Scale divider and section liner | layout tools |
| 496,123 | Apr. 25, 1893 | W.L. Keuffel | Zig Zag Rule | folding rule joints |
| 645,263 | Mar. 13, 1900 | W.L. Keuffel | Tape reel | tape measures |
| 651,142 | Jun. 05, 1900 | W.L. Keuffel | Slide Rule | slide rules |
| 702,439 | Jun. 17, 1902 | W. Keuffel | Tape Reel | tape measures |
| 1,150,771 | Aug. 17, 1915 | W.L. Keuffel | Slide rule runner | slide rules |
| 1,501,169 | Jul. 15, 1924 | A.W. Keuffell | Process of Making Drawing Instruments | layout tools |
| 1,934,232 | Nov. 07, 1933 | A.W. Keuffel | Slide rule | slide rules |
