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| Patents for Hugo Koelker | |||||
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| Number | Date | Patentee | Title | Type | |
| 326,561 | Sep. 22, 1885 | L.N. Hopkins, G.M. Hopkins | Gas Engine | gas and gasoline engines | |
| 410,474 | Sep. 03, 1889 | H.D. Wickes | Saw-mill | reciprocating sawmills | |
| 437,360 | Sep. 30, 1890 | W. Hochhausen | Dynamo-electric machine | electric motors | |
| 441,962 | Dec. 02, 1890 | C. Morrill | Saw-Set | saw sets | |