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| All Patents in class 60/521 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 91,239 | Jun. 15, 1869 | W. Lehmann | Hot Air Engine | ||
| 324,061 | Aug. 11, 1885 | G. Patten, J. Merrill, J.A. Woodbury, E.F. Woodbury | Hot Air Engine | ||
| 331,361 | Dec. 01, 1885 | E.F. Woodbury, G. Patten, J. Merrill, J.A. Woodbury | Air Engine | ||
| 336,093 | Feb. 16, 1886 | L.A. Daelen | Caloric-Engine | ||
| 345,450 | Jul. 13, 1886 | A.K. Rider | Air Engine | ||
| 445,904 | Feb. 03, 1891 | H. Robinson | Hot Air Engine | ||