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| Patents for Felix A. Denison | |||||
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| Number | Date | Patentee | Title | Type | |
| 156,498 | Nov. 03, 1874 | M. Pratt | Improvement in machines for trimming keys of musical instruments | music instrument maker | |
| 162,417 | Apr. 20, 1875 | M. Pratt | Improvement in devices for shaping piano-keys | wood shapers | |
| 182,224 | Sep. 12, 1876 | C.W. Pratt | Improvement in power hand-drill stocks | hand drills | |