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| Patents for William H. Halladay | |||||
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| Number | Date | Patentee | Title | Type | |
| 120,966 | Nov. 14, 1871 | W.H. Halladay | Improvement in guides for sewing-machines | sewing machines | |
| 254,869 | Mar. 14, 1882 | W.H. Halladay | Saw-sharpening machine | saw sharpening machines | |
| RE10,252 | Dec. 05, 1882 | W.L. Covel | Saw-sharpening | saw sharpening machines | |
| 381,775 | Apr. 24, 1888 | W.H. Halladay | Saw-sharpening machine | saw sharpening machines | |