| Patents for Porter-Allen Engine Co. |
Patents 1 -
12
of 12
      |
| Number | Date | Patentee | Title | Type |
| 35,068 | Apr. 29, 1862 | J.F. Allen | Steam-engine | steam engines |
| 35,069 | Apr. 29, 1862 | J.F. Allen | Improvement in slide-valves for steam-engines | steam engine valve gear |
| 35,070 | Apr. 29, 1862 | J.F. Allen | Improved link-motion for steam-engines | steam engines |
| 35,071 | Apr. 29, 1862 | J.F. Allen | Improved valve-gear for steam-engines | steam engine valve gear |
| 36,695 | Oct. 21, 1862 | J.F. Allen | Improvement in valve-gears of steam-engines | steam engine valve gear |
| 52,810 | Feb. 27, 1866 | J.F. Allen | Improved apparatus for punching | metal punches |
| 73,069 | Jan. 07, 1868 | J.F. Allen | Improvement in valve-gear | steam engine valve gear |
| 76,580 | Apr. 14, 1868 | J.F. Allen | Improvement in steam-generator | stationary boilers |
| 76,581 | Apr. 14, 1868 | J.F. Allen | Improvement in decarbonizing iron | foundryman |
| 95,868 | Oct. 19, 1869 | J.F. Allen | Improvement in steam-engine slide-valves | steam engine valves |
| 167,865 | Sep. 21, 1875 | J.F. Allen | Improvement in balanced valves | steam engine valves |
| RE9,303 | Jul. 20, 1880 | J.F. Allen | Balanced valve | steam engine valves |
