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| Patents for Irvin Drowns | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,375,785 | Apr. 26, 1921 | I. Drowns | Tool Holder | lathe tool holders and tool posts | |
| 1,751,078 | Mar. 18, 1930 | I. Drowns | Tool Holder | metalworking machine tool holders | |
| 1,820,056 | Aug. 25, 1931 | I. Drowns | Boring Tool Holder | drilling and boring tool holders | |