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| All Patents in class 123/229 | |||||
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| Number | Date | Patentee | Title | Type | |
| 428,762 | May 27, 1890 | W.S. Sharpneck | Rotary Gas Engine | rotary engines | |
| 575,517 | Jan. 19, 1897 | J.D. Blagden | Rotary Gas Engine | rotary engines | |
| 1,859,618 | May 24, 1932 | W.W. Cleland | Rotary Internal Combustion Engine | rotary engines | |