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| Patents for Charles F. Spencer | |||||
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| Number | Date | Patentee | Title | Type | |
| 37,579 | Feb. 03, 1863 | C.B. Hutchinson | Improvement for grinding and pressing grapes, apples, &c. | ||
| 247,726 | Sep. 27, 1881 | W.N. Whipple | Portable saw-mill | circular sawmills | |
| 554,034 | Feb. 04, 1896 | A.C. Saxton | Axle Cutter | axle cutters and threaders | |