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| Patents for Earl H. Roberts | |||||
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| Number | Date | Patentee | Title | Type | |
| 991,886 | May 09, 1911 | J. Johnston, J.C. Potter | Turret Lathe | turret lathes | |
| 1,109,301 | Sep. 01, 1914 | J.C. Potter | Tool for machining bevel-gear blanks and other objects with inclined surfaces | metal lathe accessories and attachments | |
| 1,115,972 | Nov. 03, 1914 | J.C. Potter | Automatic turret-lathe | turret lathes | |