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| Patents for Charles J. Widmer | |||||
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| Number | Date | Patentee | Title | Type | |
| 905,259 | Dec. 01, 1908 | C.J. Widmer | Corn-sheller | corn shellers | |
| 905,260 | Dec. 01, 1908 | C.J. Widmer | Combined friction and jaw clutch | industrial machine clutches | |
| 921,324 | May 11, 1909 | C.J. Widmer | Corn-sheller | corn shellers | |