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| Patents for William C. De Roo | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,715,321 | May 28, 1929 | W.C. De Roo | Radial drill machine | radial drill presses | |
| 1,756,454 | Apr. 29, 1930 | W.C. De Roo | Spring counterbalance for drill spindles | drill presses | |
| 1,781,274 | Nov. 11, 1930 | W.C. De Roo | Feed-control mechanism | drill presses | |
| 1,799,358 | Apr. 07, 1931 | W.C. De Roo | Safety-catch mechanism | radial drill presses | |
| 1,825,181 | Sep. 29, 1931 | W.C. De Roo | Electrical operated column clamp for radial drills | radial drill presses | |