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| Patents for Leonard O. Carlsen | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,656,633 | Jan. 17, 1928 | L.O. Carlsen, E. Finsen, E.C. Head | Gear-cutting machine | gear making machines | |
| 2,101,237 | Dec. 07, 1937 | L.O. Carlsen | Machine for producing gears | gear making machines | |
| 2,188,996 | Feb. 06, 1940 | L.O. Carlsen | Indexing mechanism | gear making machines | |