| Patents for W. & B. Douglas |
Patents 1 -
15
of 30
      |
| Number | Date | Patentee | Title | Type |
| 2,895 | Dec. 31, 1842 | W. Douglas, B. Douglas | Pump | household hand pumps |
| 19,834 | Apr. 06, 1858 | W. Douglas, B. Douglas | Portable pump | household hand pumps |
| 23,649 | Apr. 12, 1859 | W. Douglas, B. Douglas | Pump | household hand pumps |
| 30,603 | Nov. 06, 1860 | B. Douglas | Pump | household hand pumps |
| 33,299 | Sep. 17, 1861 | B. Douglas | Pump stand | household hand pumps |
| 35,059 | Apr. 22, 1862 | J.W. Douglas | Double-acting hand pump | household hand pumps |
| 35,802 | Jul. 01, 1862 | B. Douglas | Improved side force-pump | household hand pumps |
| 38,444 | May 05, 1863 | J.W. Douglas | Improvement in pumps | household hand pumps |
| 56,671 | Jul. 24, 1866 | J.W. Douglas | Double acting pump | household hand pumps |
| 64,292 | Apr. 30, 1867 | J.W. Douglas | Improvement in hose-couplings | household hand pumps |
| 68,781 | Sep. 10, 1867 | H.S. North | Improved snap-hook | |
| 74,321 | Feb. 11, 1868 | J.W. Douglas | Improvement in pumps | household hand pumps |
| 81,611 | Sep. 01, 1868 | J.W. Douglas | Grindstone Frame | grinders |
| 85,434 | Dec. 29, 1868 | T. Drew | Improved compound for extinguishing fires | fire extinguishers |
| 93,974 | Aug. 24, 1869 | J.W. Douglas | Knapsack fire extinguisher | fire extinguishers |
