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| Patents for I. D. Walker | |||||
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| Number | Date | Patentee | Title | Type | |
| 407,842 | Jul. 30, 1889 | A. Schuermann | Tool-driver | spiral screwdrivers | |
| 422,520 | Mar. 04, 1890 | O.Z. Greene | Screw-driver | spiral screwdrivers | |
| 510,994 | Dec. 19, 1893 | T. Schafer | Extensible Measuring Stick | special purpose gauges | |