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| Patents for Henry D. Dann | |||||
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| Number | Date | Patentee | Title | Type | |
| 134,653 | Jan. 07, 1873 | H.D. Dann | Improvement in sawmill-dogs | sawmill dogs | |
| RE6,071 | Sep. 29, 1874 | H.D. Dann | Improvement in sawmill dogs | sawmills | |
| RE6,733 | Nov. 09, 1875 | H.D. Dann | Improvement in saw-mill dogs | sawmills | |