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| Patents for Duplex Rotary Engine Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 461,161 | Oct. 13, 1891 | A. Grant, J.S. Kiehl, F. Meyer | Rotary Steam Engine | rotary steam engines | |
| 464,285 | Dec. 01, 1891 | F. Meyer | Rotary Steam Engine | rotary steam engines | |
| 905,476 | Dec. 01, 1908 | E.W. Gragert, F. Stoehr | Rotary Engine | rotary steam engines | |