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| Patents for J. F. Callan | |||||
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| Number | Date | Patentee | Title | Type | |
| 20,344 | May 25, 1858 | N.J. Glover | Machine for turning irregular forms | pattern lathes | |
| 22,073 | Nov. 16, 1858 | A. Gregory | Weight/Balance Shifting Hammer | hammer handles | |
| 88,002 | Mar. 23, 1869 | G. Atkins | Improvement in the Manufacturing of Sheet Iron | tool making machines | |