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| Patents for Benjamin Douglas | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,895 | Dec. 31, 1842 | W. Douglas, B. Douglas | Pump | |
 | 19,834 | Apr. 06, 1858 | W. Douglas, B. Douglas | Portable pump | |
 | 23,649 | Apr. 12, 1859 | W. Douglas, B. Douglas | Pump | |
 | 30,603 | Nov. 06, 1860 | B. Douglas | Pump | |
 | 33,299 | Sep. 17, 1861 | B. Douglas | Pump stand | |
 | 35,059 | Apr. 22, 1862 | J.W. Douglas | Double-acting hand pump | |
 | 35,802 | Jul. 01, 1862 | B. Douglas | Improved side force-pump | |
 | 166,195 | Aug. 03, 1875 | J.W. Douglas | Improvement in water-hydrants | |