| Patents for Joseph W. Douglas |
Patents 1 -
15
of 25
      |
| Number | Date | Patentee | Title | Type |
| 35,059 | Apr. 22, 1862 | J.W. Douglas | Double-acting hand 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 |
| 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 |
| 102,664 | May 03, 1870 | J.W. Douglas | Improvement in pump-valves | household hand pumps |
| 144,965 | Nov. 25, 1873 | J.W. Douglas | Improvement in pumps | household hand pumps |
| 151,364 | May 26, 1874 | J.W. Douglas | Improvement in the construction of pump-gearing | household hand pumps |
| 158,786 | Jan. 19, 1875 | J.W. Douglas | Lining pump cylinders | household hand pumps |
| 166,195 | Aug. 03, 1875 | J.W. Douglas | Improvement in water-hydrants | hydrants |
