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| All Patents in class 122/442 | |||||
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| Number | Date | Patentee | Title | Type | |
| 278,196 | May 22, 1883 | E.R. Stilwell | Feed-water heater | feedwater apparatus | |
| 1,828,633 | Oct. 20, 1931 | C.D. Allen, F.W. Walch, B.T. Williston | Injector for Feeding Water to Steam Boilers | water injectors | |
| 1,944,080 | Jan. 16, 1934 | J.N. Gresham, H.E. Gresham | Feed Water Heater of the Injector Type | water injectors | |