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