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| Patents for Willie L. E. Keuffel | |||||
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| Number | Date | Patentee | Title | Type | |
| 496,123 | Apr. 25, 1893 | W.L. Keuffel | Zig Zag Rule | folding rule joints | |
| 651,142 | Jun. 05, 1900 | W.L. Keuffel | 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 | |