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| Patents for Louis F. Hart | |||||
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| Number | Date | Patentee | Title | Type | |
| 925,100 | Jun. 15, 1909 | L.F. Hart | Screw Cutting Device | tap and die holders | |
| 925,181 | Jun. 15, 1909 | L.F. Hart | Screw Cutting Device | tap and die holders | |
| 962,024 | Jun. 21, 1910 | L.F. Hart | Screw Cutting Device | pipe threading machines | |
| 1,506,484 | Aug. 26, 1924 | L.F. Hart | Diestock | taps and dies | |