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| Patents for Halladay, Litchfield & Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 172,092 | Jan. 11, 1876 | W.L. Covel | Improvement in saw-sharpening machines | |
| 222,386 | Dec. 09, 1879 | W.L. Covel | Improvement in saw-sharpening machines | ||
 | 254,869 | Mar. 14, 1882 | W.H. Halladay | Saw-sharpening machine | |
 | CA-15,491 | Sep. 19, 1882 | W.H. Halladay | Improvements on automatic saw-sharpeners | |
 | RE10,252 | Dec. 05, 1882 | W.L. Covel | Saw-sharpening | |