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| Patents for Hendrick Julius Hjorth | |||||
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| Number | Date | Patentee | Title | Type | |
| 540,984 | Jun. 11, 1895 | H.J. Hjorth | Breast or Hand Drill | breast drills | |
| 1,127,890 | Feb. 09, 1915 | H.J. Hjorth | T-Rest for Lathes | metal lathe accessories and attachments | |
| 1,232,801 | Jul. 10, 1917 | H.J. Hjorth | Universal Lathe Attachment | metal lathe accessories and attachments | |
| 1,442,149 | Jan. 16, 1923 | H.J. Hjorth | Drilling Machine | drill presses | |
| 1,807,625 | Jun. 02, 1931 | H.J. Hjorth | Valve Wrench | wrenches | |