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| All Patents in class 277/486 | |||||
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| Number | Date | Patentee | Title | Type | |
| 238,935 | Mar. 15, 1881 | W.J. Liddell | Piston-packing | piston ring and packing | |
| 693,777 | Feb. 18, 1902 | E. Berry | Steam or Other Piston | steam engine pistons | |
| 924,789 | Jun. 15, 1909 | J. Rigg, J. Jones | Packing Device for Pistons, Piston Valves and the Like | piston ring and packing | |