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| Patents for Rudolf E. Hellmund | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,116,424 | Nov. 10, 1914 | R.E. Hellmund | Induction-motor | induction motors | |
| 1,261,126 | Apr. 02, 1918 | R.E. Hellmund | Dynamo-electric machine | motor cooling | |
| 1,261,386 | Apr. 02, 1918 | R.E. Hellmund, C.W. Starker | Dynamo-electric machine | motor cooling | |