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| Patents for Richard N. Watrous | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 851 | Jul. 24, 1838 | R.N. Watrous, E. L'Hommedieu | Machinery for manufacturing double-twist screw-augers | |
 | 18,877 | Dec. 15, 1857 | R.N. Watrous | Drawing Knife | |
 | 117,838 | Aug. 08, 1871 | R.N. Watrous | Improvement in the construction of dies for forming the lips of auger-bits | |