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| Patents for John F. C. Preinkert | |||||
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| Number | Date | Patentee | Title | Type | |
| 255,011 | Mar. 14, 1882 | A.W. Norton | Lathe | backing off attachments | |
| 291,933 | Jan. 15, 1884 | D.R. Porter | Wrench | pipe wrenches | |
| 301,945 | Jul. 15, 1884 | A.C. Winn | Gage | measurement gauges | |
| 302,079 | Jul. 15, 1884 | A.C. Winn | Caliper Square | measurement gauges | |
| 336,915 | Mar. 02, 1886 | F.W. Gray | Hose Spanner | firehose and hydrant wrenches | |