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| Patents for Henry J. Hjorth | |||||
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| Number | Date | Patentee | Title | Type | |
| 761,381 | May 31, 1904 | H.J. Hjorth | Surface Gage | surface gauges | |
| 861,283 | Jul. 30, 1907 | H.J. Hjorth | Wire Winding Tool | spring winding tools | |
| 981,426 | Jan. 10, 1911 | H.J. Hjorth | Tail Stock | ||
| 1,005,214 | Oct. 10, 1911 | H.J. Hjorth | Headstock or Chuck | ||
| 1,060,186 | Apr. 29, 1913 | H.J. Hjorth | Lantern Holder for Boats | shipwright | |
| 1,174,009 | Feb. 29, 1916 | H.J. Hjorth | Gage for Edged Tools | special purpose gauges | |