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| All Patents in class 440/38 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,355X | Mar. 10, 1826 | G. Deming | Steam engine for boats | steamboats | |
| 3,606 | May 30, 1844 | P. Von Schmidt | Submerged Propeller | nautical propulsion apparatus | |
| 120,823 | Nov. 14, 1871 | J.M. McMaster | Improvement in propulsion of canal-boats | boats and ships | |