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| Patents for D. Frank Hartford | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 47,102 | Apr. 04, 1865 | D.F. Hartford | Screwdriver and Tweezers | |
 | 54,069 | Apr. 17, 1866 | D.F. Hartford | Improvement in drill-stocks | |
 | 68,071 | Aug. 27, 1867 | D.F. Hartford | Improved Bow-Drill Stock | |
 | 72,632 | Dec. 24, 1867 | D.F. Hartford | Improvement in Stringing Bow-Drill Stocks | |