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| Patents for Frederic Kraengel | |||||
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| Number | Date | Patentee | Title | Type | |
| 231,331 | Aug. 17, 1880 | F. Kraengel | Adjustable Frog for Plane Cutter Adjustments | plane throat adjustments | |
| 231,332 | Aug. 17, 1880 | F. Kraengel | Nail-Extractor | nail extractors | |
| 250,080 | Nov. 29, 1881 | F. Kraengel | Spirit Level | inclinometers | |