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| Patents for Elmer P. Howe | |||||
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| Number | Date | Patentee | Title | Type | |
| 257,530 | May 09, 1882 | B.F. Sturtevant | Steam Slide Valve | steam engine valves | |
| 335,259 | Feb. 02, 1886 | B.H. Warren | Horseshoe-calk | horseshoes | |
| 336,863 | Feb. 23, 1886 | W.S. McGowan, Jr. | Horseshoe | horseshoes | |