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| All Patents in class 137/534 | |||||
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| Number | Date | Patentee | Title | Type | |
| 58,987 | Oct. 23, 1866 | G.H. Clemens, D.G. Coppin | Improvement in safety valves | ||
| 62,476 | Feb. 26, 1867 | G.H. Clemens, D.G. Coppin | Improvement in lock-up safety-valves | ||
| 62,477 | Feb. 26, 1867 | G.H. Clemens, D.G. Coppin | Improvement in lock-up safety-valves | ||
| 81,878 | Sep. 08, 1868 | G.H. Clemens, E. Clemens | Improvement in steam safety-valves | steam safety valves | |