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| Patents for Isaac L. Penney | |||||
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| Number | Date | Patentee | Title | Type | |
| 138,815 | May 13, 1873 | I.L. Penney | Improvement in lock-cutting machines | hoop making machines | |
| 230,715 | Aug. 03, 1880 | I.L. Penney | Grinding Twist Drills | tool grinders | |
| 302,520 | Jul. 22, 1884 | I.L. Penney | Trip Hammer | drop hammers | |