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| Patents for Hartig Standard Gas Engine Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 324,554 | Aug. 18, 1885 | H. Hartig | Gas Engine | |
| 391,528 | Oct. 23, 1888 | H. Hartig | Gas Engine | ||
| 415,197 | Nov. 19, 1889 | H.J. Hartig | Gas Engine | ||
| 451,047 | Apr. 28, 1891 | H.J. Hartig | Governor for Engines | ||
| 674,580 | May 21, 1901 | H.J. Hartig | Speed-Regulator for Explosive-Engines | ||