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| Patents for William Douglas | |||||
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| Picture | Number | Date | Patentee | Title | |
| 9,043X | Aug. 20, 1835 | W. Douglas | Double forcing pumps | ||
 | 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 | |
 | 188,298 | Mar. 13, 1877 | R. Jones | Coach-Wrench | |
 | 1,422,345 | Jul. 11, 1922 | W. Douglas | Ellipse Drawing Tool | |