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| Patents for Waldo M. Chapin | |||||
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| Picture | Number | Date | Patentee | Title | |
| 686,726 | Nov. 19, 1901 | A. Langley, E.M. Griffiths | Backing-Off Mechanism for Lathes | ||
| 800,470 | Sep. 26, 1905 | E.J. McClellan | Milling Machine | ||
 | 892,656 | Jul. 07, 1908 | G.W. Euker | Controller for alternating-current motors | |
 | 979,862 | Dec. 27, 1910 | W.B. Lane | Ratchet Mechanism For Screw Drivers and the Like | |