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| Patents for Hugh Campbell | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 27,090 | Feb. 07, 1860 | A.C. Richard | Improved Mode of Constructing Screw-Wrenches | |
| 367,184 | Jul. 26, 1887 | H. Campbell | Gas Engine | ||
| 428,801 | May 27, 1890 | H. Campbell | Gas Motor Engine | ||
| 523,511 | Jul. 24, 1894 | H. Campbell | Oil Engine | ||