| Patents for Howland, Angell & King |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 12,207 | Jan. 09, 1855 | W.C. Hicks | Arrangement of slide-valves and exhaust-passages in steam-engines | steam engine valves |
| 46,470 | Feb. 21, 1865 | W.C. Hicks | Improvement in steam-engines | steam engines |
| 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 |
