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| All Patents in class 417/180 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,596,523 | Aug. 17, 1926 | L. Friedmann | Exhaust Steam Injector | water injectors | |
| 1,629,712 | May 24, 1927 | S.L. Kneass | Injector | water injectors | |
| 1,712,148 | May 07, 1929 | S.L. Kneass | Process of Continuosly Supplying Steam at Low Pressure to Injectors | water injectors | |
| 2,181,701 | Nov. 28, 1939 | H.E. Lingenbrink | Injector | water injectors | |
| 2,389,656 | Nov. 27, 1945 | E. Henkel, A. Williams | Injector | water injectors | |