| All Patents in class 123/68 |
Patents 31 -
45
of 65
      |
| Number | Date | Patentee | Title | Type |
| 343,745 | Jun. 15, 1886 | S. Wilcox | Gas Engine | gas and gasoline engines |
| 347,469 | Aug. 17, 1886 | J.H. Clark | Gas Engine | gas and gasoline engines |
| 348,998 | Sep. 14, 1886 | J.F. Place | Gas Engine | gas and gasoline engines |
| 353,402 | Nov. 30, 1886 | J.H. Clark | Reversible Gas Engine | gas and gasoline engines |
| 388,372 | Aug. 21, 1888 | N.A. Otto | Gas Motor Engine | gas and gasoline engines |
| 399,348 | Mar. 12, 1889 | G.M. Richards | Hydrocarbon Engine | internal combustion engines |
| 418,418 | Dec. 31, 1889 | L.H. Nash | Method of Operating Gas Engines | gas and gasoline engines |
| 425,116 | Apr. 08, 1890 | A.T. Griggs, J.R. Valentine | Gas Engine | gas and gasoline engines |
| 437,776 | Oct. 07, 1890 | E.H. Gaze | Gas Engine | gas and gasoline engines |
| 439,200 | Oct. 28, 1890 | H.K. Shanck | Gas Engine | ignition systems |
| 514,211 | Feb. 06, 1894 | B.H. Coffey | Gas Engine | internal combustion engines |
| 523,628 | Jul. 24, 1894 | W.S. Elliott, Jr. | Gas Heater for Internal Combustion Engines | |
| 529,452 | Nov. 20, 1894 | M. Lorois | Gas Motor | internal combustion engines |
| 548,142 | Oct. 15, 1895 | H. Schumm | Apparatus for Working Gas or Oil Engines | gas and gasoline engines |
| 548,824 | Oct. 29, 1895 | H.F. Wallmann | Petroleum or Gas Motor | |
