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| Patents for Frederick W. Walch | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,828,633 | Oct. 20, 1931 | C.D. Allen, F.W. Walch, B.T. Williston | Injector for Feeding Water to Steam Boilers | water injectors | |
| CA-325,726 | Sep. 06, 1932 | C.D. Allen, F.W. Walch, B.T. Williston | Injecteur d'eau Dans Chausiere a Vapeur | water injectors | |