| Patents for W. & B. Douglas |
Patents 1 -
10
of 30
      |
| Picture | Number | Date | Patentee | Title |
 | 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 |
 | 30,603 | Nov. 06, 1860 | B. Douglas | Pump |
 | 33,299 | Sep. 17, 1861 | B. Douglas | Pump stand |
 | 35,059 | Apr. 22, 1862 | J.W. Douglas | Double-acting hand pump |
 | 35,802 | Jul. 01, 1862 | B. Douglas | Improved side force-pump |
 | 38,444 | May 05, 1863 | J.W. Douglas | Improvement in pumps |
 | 56,671 | Jul. 24, 1866 | J.W. Douglas | Double acting pump |
 | 64,292 | Apr. 30, 1867 | J.W. Douglas | Improvement in hose-couplings |
