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| All Patents in class 277/449 | |||||
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| Number | Date | Patentee | Title | Type | |
| 693,777 | Feb. 18, 1902 | E. Berry | Steam or Other Piston | steam engine pistons | |
| 2,180,795 | Nov. 21, 1939 | N.A. Christensen | Packing | shaft seals | |
| 2,386,117 | Oct. 02, 1945 | R.M. Hvid | Engine Piston Construction | pistons | |
| 2,570,647 | Oct. 09, 1951 | G.A. Cormier | Power Cylinder and Piston With Leakage Control | hydraulic apparatus | |