| Patents for Porter-Allen Engine Co. |
Patents 1 -
10
of 12
      |
| Picture | Number | Date | Patentee | Title |
 | 35,068 | Apr. 29, 1862 | J.F. Allen | Steam-engine |
 | 35,069 | Apr. 29, 1862 | J.F. Allen | Improvement in slide-valves for steam-engines |
 | 35,070 | Apr. 29, 1862 | J.F. Allen | Improved link-motion for steam-engines |
 | 35,071 | Apr. 29, 1862 | J.F. Allen | Improved valve-gear for steam-engines |
| | 36,695 | Oct. 21, 1862 | J.F. Allen | Improvement in valve-gears of steam-engines |
 | 52,810 | Feb. 27, 1866 | J.F. Allen | Improved apparatus for punching |
 | 73,069 | Jan. 07, 1868 | J.F. Allen | Improvement in valve-gear |
 | 76,580 | Apr. 14, 1868 | J.F. Allen | Improvement in steam-generator |
 | 76,581 | Apr. 14, 1868 | J.F. Allen | Improvement in decarbonizing iron |
 | 95,868 | Oct. 19, 1869 | J.F. Allen | Improvement in steam-engine slide-valves |
