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| All Patents in class 123/23 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 36,581 | Sep. 30, 1862 | M.D. Whipple | Hot Air Engine | ||
| 46,084 | Jan. 31, 1865 | M.G. Crane | Hot Air Engine | ||
| 52,305 | Jan. 30, 1866 | T. McDonough | Hot Air Engine | ||
 | 111,087 | Jan. 17, 1871 | A.K. Rider | Hot Air Engine | |
| 133,649 | Dec. 03, 1872 | C.P. Leavitt | Hot Air Engines | ||
 | 608,845 | Aug. 09, 1898 | R. Diesel | Internal Combustion Engine | |
| 633,878 | Sep. 26, 1899 | R. Mewes | Combustion Motor | ||