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| Patents for D. N. B. Coffin | |||||
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| Number | Date | Patentee | Title | Type | |
| 236,780 | Jan. 18, 1881 | Z.E. Coffin | Stop-valve | water valves | |
| 243,691 | Jul. 05, 1881 | Z.E. Coffin | Hydrant-valve | hydrants | |
| 283,376 | Aug. 21, 1883 | Z.E. Coffin | Machine for turning pipe-flanges | metal lathes | |
| 330,377 | Nov. 17, 1885 | Z.E. Coffin | Hydrant | hydrants | |