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| Patents for Irving Spencer | |||||
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| Number | Date | Patentee | Title | Type | |
| 119,007 | Sep. 19, 1871 | H. Bickford | Improvement in mortising-machines | mortising machines | |
| RE6,773 | Nov. 30, 1875 | W.H. Doane, W.E. London | Improvement in combined planing and matching machines | wood planers | |
| 175,676 | Apr. 04, 1876 | W.H. Doane, G.W. Bugbee | Planer-matcher convertible to planer | matchers | |