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| Patents for C. Leffingwell | |||||
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| Number | Date | Patentee | Title | Type | |
| 56,145 | Jul. 03, 1866 | C. Leffingwell | Improvement in head-blocks for sawmills | sawmill headblocks | |
| 93,724 | Aug. 17, 1869 | C. Leffingwell | Improvement in head-blocks for sawmills | sawmill headblocks | |
| 97,302 | Nov. 30, 1869 | C. Leffingwell | Improvement in head-blocks for sawmills | sawmill headblocks | |