| Patents for Roswell H. St. John |
Patents 1 -
5
of 5
      |
| Number | Date | Patentee | Title | Type |
| 18,213 | Sep. 15, 1857 | R.H. St. John | Watchmakers' lathe | watchmakers lathes |
| 19,468 | Feb. 23, 1858 | S.G. Hoge | Improvement in the manner of attaching legs to walking locomotives | railroad locomotives |
| 112,978 | Mar. 21, 1871 | R.H. St. John | Improvement in hinges for sewing-machines | sewing machines |
| 175,197 | Mar. 21, 1876 | R.H. St. John | Improvement in wringers | washing machines |
| 188,978 | Mar. 27, 1877 | R.H. St. John | Adjustable Tap Wrench | tap wrenches and die stocks |
