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| Patents for John H. McGowan | |||||
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| Number | Date | Patentee | Title | Type | |
| 79,769 | Jul. 07, 1868 | J.H. McGowan | Tobacco Press | tobacco machinery | |
| 119,039 | Sep. 19, 1871 | D.B. Caldwell, J.H. McGowan | Steam Engine | steam engines | |
| 143,292 | Sep. 30, 1873 | D.B. Caldwell, J.H. McGowan | Crank-Connection for Steam Engines | steam engine crank rods | |