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| Patents for Leo J. DuMais | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,028,720 | Jun. 04, 1912 | J.W. Hasburg | Marking-Gage or Tram | trammels | |
| 1,240,619 | Sep. 18, 1917 | K. Stiegelmayer | Cutter | knives and cutters | |
| 1,252,367 | Jan. 01, 1918 | A.G. Hug, C.A. Scott | Razor Blade Sharpener | cutler | |