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| All Patents in class 123/450 | |||||
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| Number | Date | Patentee | Title | Type | |
| 600,974 | Mar. 22, 1898 | J. Holroyd, E. Wiseman | Hydrocarbon Motor | oil engines | |
| 1,451,407 | Apr. 10, 1923 | C.E. Sargent | Internal Combustion Engine | diesel engines | |
| 2,232,305 | Feb. 18, 1941 | H.F. Bakewell | Internal combustion engine | gas and gasoline engines | |