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| Patents for John F. C. Preinkert | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 255,011 | Mar. 14, 1882 | A.W. Norton | Lathe | |
 | 291,933 | Jan. 15, 1884 | D.R. Porter | Wrench | |
 | 301,945 | Jul. 15, 1884 | A.C. Winn | Gage | |
 | 302,079 | Jul. 15, 1884 | A.C. Winn | Caliper Square | |
 | 336,915 | Mar. 02, 1886 | F.W. Gray | Hose Spanner | |