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| Patents for Douglas, Rogers & Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 27,040 | Feb. 07, 1860 | F. Douglas | Improved steam-trap | |
 | 27,704 | Apr. 03, 1860 | F. Douglas | Improved steam-trap | |
 | 39,799 | Sep. 08, 1863 | F. Douglas | Improvement in governors for steam-engines | |
 | 39,800 | Sep. 08, 1863 | F. Douglas | Improvement in skate-fastenings | |