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| Patents for Farrar & Trefts | |||||
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| Number | Date | Patentee | Title | Type | |
| 166,758 | Aug. 17, 1875 | C.M. Farrar | Rotary Balanced Valve | steam engine valves | |
| 335,197 | Feb. 02, 1886 | W.M. Hoffman | Fleshing and Unhairing Machine | ||
| 335,198 | Feb. 02, 1886 | W.M. Hoffman | Putting Out and Striking Out Machine for Hides or Skins | ||
| 941,531 | Nov. 30, 1909 | E. Oldman | Manhole Cover Plate | ||