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| All Patents in class 137/477 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,696,452 | Dec. 25, 1928 | F.E. Raymond | Valve | steam safety valves | |
| 2,355,916 | Aug. 15, 1944 | E. Klafstad | Relief Valve | steam safety valves | |
| 2,414,794 | Jan. 28, 1947 | T.W. Bergquist | Safety valve | steam safety valves | |