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| Patents for Otis Warren | |||||
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| Number | Date | Patentee | Title | Type | |
| 147,921 | Feb. 24, 1874 | J.P. Fay | Improvement in Tool-Grinding Machines | sharpening machines | |
| 149,020 | Mar. 24, 1874 | A. Wood | Metal Shaft Turning Lathes | shaft turning lathes | |
| 151,912 | Jun. 09, 1874 | F.E. Reed | Improvement in Metal-Drilling Machines | drill presses | |
| 151,948 | Jun. 09, 1874 | J.F. Light, A. Wood | Improvement in devices for transmitting motion | drill presses | |