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| All Patents in class 60/412 | |||||
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| Number | Date | Patentee | Title | Type | |
| 27,938 | Apr. 17, 1860 | W.C. Turnbull | Air Engine | air motors and turbines | |
| 331,359 | Dec. 01, 1885 | E.F. Woodbury, G. Patten, J. Merrill, J.A. Woodbury | Air Engine | hot air engines | |
| 3,400,881 | Sep. 10, 1968 | G.N. Levesque | Compressed Air Economizer for Fluidic Controls | ||