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| Patents for Ralph Allen | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 29,646 | Aug. 14, 1860 | A.J. Allen | Steam Pressure Gage | |
 | RE2,313 | Jul. 17, 1866 | A.J. Allen | Steam Gauge | |
 | 1,324,486 | Dec. 09, 1919 | R. Allen | Carpenter's Plane | |
 | 1,361,433 | Dec. 07, 1920 | R. Allen | Carpenter's plane | |