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| Patents for Frederick K. Zwald | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,742,565 | Jul. 03, 1973 | R.B. Baldwin, F.K. Zwald, C.E. Boboltz | Rotary cutter | cutterheads | |
| 3,776,289 | Dec. 04, 1973 | F.K. Zwald, C.E. Boboltz, R.B. Baldwin | Cutting tool holder | cutterheads | |