| Patents for John M. Douglas |
Patents 1 -
14
of 14
      |
| Number | Date | Patentee | Title | Type |
| 19,834 | Apr. 06, 1858 | W. Douglas, B. Douglas | Portable pump | household hand pumps |
| 33,299 | Sep. 17, 1861 | B. Douglas | Pump stand | 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 |
| 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 |
| 93,974 | Aug. 24, 1869 | J.W. Douglas | Knapsack fire extinguisher | fire extinguishers |
| 97,767 | Dec. 14, 1869 | J.W. Douglas | Improvement in pumps | household hand pumps |
| 97,894 | Dec. 14, 1869 | J.W. Douglas | Improved apparatus for extinguishing fires by means of chemical agents | fire extinguishers |
| 98,674 | Jan. 11, 1870 | J.W. Douglas | Improvement in adjustable attachment of pump-barrels to their bases | household hand pumps |
| 173,601 | Feb. 15, 1876 | J.W. Douglas | Improvement in vehicle-wheels | wheelwright |
| 192,979 | Jul. 10, 1877 | J.W. Douglas | Improvement in portable pumps | household hand pumps |
| 244,384 | Jul. 19, 1881 | J.W. Douglas | Pump | household hand pumps |
