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| Patents for John F. Dettmar | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 137,765 | Apr. 15, 1873 | R. Dudgeon | Improvement in hydraulic jacks | |
 | 550,702 | Dec. 03, 1895 | J. Weeks | Hydraulic jack | |
 | 568,421 | Sep. 29, 1896 | J. Weeks | Dock and vessel leveling device | |
 | 571,547 | Nov. 17, 1896 | J. Weeks | Hydraulic jack | |