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| Patents for H. Walker | |||||
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| Number | Date | Patentee | Title | Type | |
| 640,084 | Dec. 26, 1899 | P.H. Bohner, C.A. Bohner | Chain Pipe Wrench | chain and strap wrenches | |
| 686,045 | Nov. 05, 1901 | W.F. Folmer | Curtain Shutter | camera shutters | |
| 734,329 | Jul. 21, 1903 | E.F. Hirst | Adjustable Wrench | quick adjust wrenches | |
| 743,915 | Nov. 10, 1903 | W.J. McVicker | Valve Gear For Explosive Engines | internal combustion engine valves | |
| 751,522 | Feb. 09, 1904 | A.A. Koch | Power Hammer | forging machines | |