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| Patents for Frederick A. Hannah | |||||
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| Number | Date | Patentee | Title | Type | |
| 617,014 | Jan. 03, 1899 | F.A. Hannah | Beam Compass | trammels | |
| 793,947 | Jul. 04, 1905 | F.A. Hannah, J.H. Millett | Steam Safety Valve | steam safety valves | |
| 794,034 | Jul. 04, 1905 | F.A. Hannah, J.H. Millett | Steam Safety Valve | steam safety valves | |