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| Patents for William Hjorth & Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 573,999 | Dec. 29, 1896 | J.H. Pierce | Pipe Wrench | |
 | 735,289 | Aug. 04, 1903 | K. Peterson | Pipe Wrench | |
 | 738,444 | Sep. 08, 1903 | A.W. Hjorth | Combined Pipe and Nut Wrench | |
 | CA-85,624 | Feb. 23, 1904 | A.W. Hjorth | Pipe and Nut Wrench | |