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| Patents for P. Derby & Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,323,569 | Dec. 02, 1919 | F.H. Bancroft | Automatic turning-machine | pattern lathes | |
| 1,338,275 | Apr. 27, 1920 | F.H. Bancroft | Automatic turning-machine | pattern lathes | |
| 1,461,471 | Jul. 10, 1923 | F.H. Bancroft | Wood-bending apparatus | wood bending machines | |