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| Patents for Howland, Angell & King | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 12,207 | Jan. 09, 1855 | W.C. Hicks | Arrangement of slide-valves and exhaust-passages in steam-engines | |
 | 46,470 | Feb. 21, 1865 | W.C. Hicks | Improvement in steam-engines | |
 | 91,337 | Jun. 15, 1869 | W.H. Howland | Improvement in steam-engine stop-valves | |
 | 92,051 | Jun. 29, 1869 | W.H. Howland | Improvement in steam-engine governors | |
 | 97,090 | Nov. 23, 1869 | W.H. Howland | Improvement in knife-sharpener | |
 | 244,240 | Jul. 12, 1881 | W.H. Howland | Ore-amalgamator | |