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| Patents for William H. Howland | |||||
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| Number | Date | Patentee | Title | Type | |
| 25,933 | Oct. 25, 1859 | W.H. Howland | Amalgamator | ore processing apparatus | |
| 91,337 | Jun. 15, 1869 | W.H. Howland | Improvement in steam-engine stop-valves | steam engine valves | |
| 92,051 | Jun. 29, 1869 | W.H. Howland | Improvement in steam-engine governors | steam engine governors | |
| 97,090 | Nov. 23, 1869 | W.H. Howland | Improvement in knife-sharpener | sharpening apparatus | |
| 244,240 | Jul. 12, 1881 | W.H. Howland | Ore-amalgamator | ore processing apparatus | |