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| Patents for Walter Chism | |||||
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| Number | Date | Patentee | Title | Type | |
| 952,320 | Mar. 15, 1910 | T.J. Fegley | North Bros. version of the Millers Falls "protected spring" design. | drill accessories | |
| 1,022,311 | Apr. 02, 1912 | T.J. Fegley | Spiral Screw-Driver and Drill | spiral screwdrivers | |
| 1,041,451 | Oct. 15, 1912 | T.J. Fegley, G.O. Leopold | Means for attaching blades of tools to handles | screwdrivers | |
| 1,236,848 | Aug. 14, 1917 | G.O. Leopold | Alternate driving means for the North Bros. 1445 drill | hand drills | |