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| Patents for N. T. Spear | |||||
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| Number | Date | Patentee | Title | Type | |
| 20,849 | Jul. 06, 1858 | L.A. Grover | Machine for Husking Corn | miller | |
| 21,522 | Sep. 14, 1858 | N.T. Spear | Corn Husker | corn huskers | |
| 27,841 | Apr. 10, 1860 | N.T. Spear | Machine for Husking Corn | miller | |