| All Patents in class 123/223 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 249,214 | Nov. 08, 1881 | W.H. Wigmore | Combined Gas, Air and Steam Rotary Engine | rotary steam engines |
| 260,513 | Jul. 04, 1882 | W.H. Wigmore | Gas Motor Engine | gas and gasoline engines |
| 424,000 | Mar. 25, 1890 | G.E. Hibbard | Rotary Gas Engine | rotary engines |
| 460,241 | Sep. 29, 1891 | V. Loutsky | Gas Motor | gas and gasoline engines |
| 623,361 | Apr. 18, 1899 | J.H. Frew | Oscillating Gas or Steam Engine | gas and gasoline engines |
| 660,129 | Oct. 23, 1900 | P.H. Standish | Rotary Explosive-Motor | rotary engines |
