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| Patents for Christopher Ahrens | |||||
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| Number | Date | Patentee | Title | Type | |
| 189,414 | Apr. 10, 1877 | C. Ahrens | Improvement in steam-pumps | steam pumps | |
| 287,211 | Oct. 23, 1883 | C. Ahrens | Steam-generator | steam generators | |
| 290,450 | Dec. 18, 1883 | C. Ahrens | Safety-valve | steam safety valves | |
| 292,396 | Jan. 22, 1884 | C. Ahrens | Pump-valve | pump valves | |
| 324,207 | Aug. 11, 1885 | C. Ahrens | Running-gear for vehicles | steam fire engines | |
| 495,868 | Apr. 18, 1893 | C. Ahrens | Steam-boiler | steam fire engines | |