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| Patents for Rufus L. Howard | |||||
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| Number | Date | Patentee | Title | Type | |
| 156,066 | Oct. 20, 1874 | E. Schlenker | Improvement in vises | bench vises | |
| 162,194 | Apr. 20, 1875 | E. Schlenker | Improvement in bolt-threading machines | metal threading machines | |
| 166,730 | Aug. 17, 1875 | E. Schlenker | Improvement in hoisting-machines or elevators | elevators and lifts | |