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| Patents for John Ackerman | |||||
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| Number | Date | Patentee | Title | Type | |
| 274,099 | Mar. 20, 1883 | J. Ackerman, A.O. Mitchell, F.M. Underwood | Saw-mill dog | sawmill dogs | |
| 303,967 | Aug. 26, 1884 | J. Ackerman | Saw-mill dog | sawmill dogs | |
| 365,661 | Jun. 28, 1887 | J. Ackerman, J.C. Blair | Saw-mill dog | sawmill dogs | |