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| Patents for Leonard H. Hall | |||||
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| Number | Date | Patentee | Title | Type | |
| 181,334 | Aug. 22, 1876 | L.H. Hall | Improvement in balanced valves | steam engine valves | |
| 188,048 | Mar. 06, 1877 | L.H. Hall | Aligning a shaft while pouring Babbitt | industrial machine bearings | |
| 210,850 | Dec. 17, 1878 | L.H. Hall | Imprrovement in hoisting-machines | hoists, winches, come-alongs | |
| RE9,095 | Feb. 24, 1880 | L.H. Hall | Hoisting-machine | hoists, winches, come-alongs | |