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| All Patents in class 91/287 | |||||
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| Number | Date | Patentee | Title | Type | |
| 32,917 | Jul. 23, 1861 | W.J. Stevens | Means of operating valves of steam-engines | steam engine valve gear | |
| RE1,957 | May 16, 1865 | W.J. Stevens | Improvement in the means of operating the valves of steam-engines | steam engine valve gear | |
| 144,788 | Nov. 18, 1873 | W. Hopkins, G.G. Picking | Steam-Cylinders and Piston-Valves | ||
| 255,136 | Mar. 21, 1882 | B. Brazelle | Cut-off valve | steam valves | |