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| Patents for John H. Clark | |||||
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| Picture | Number | Date | Patentee | Title | |
 | RE200 | May 13, 1851 | G.H. Corliss | Improvements in Cut-Off and Working the Valves of Steam Engines | |
| 347,469 | Aug. 17, 1886 | J.H. Clark | Gas Engine | ||
| 353,402 | Nov. 30, 1886 | J.H. Clark | Reversible Gas Engine | ||
 | 573,651 | Dec. 22, 1896 | L.L. Hall | Wench | |