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| Patents for Robert J. Simpson | |||||
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| Number | Date | Patentee | Title | Type | |
| 700,156 | May 13, 1902 | R.J. Simpson | Draftsman's Scale | rules | |
| 706,696 | Aug. 12, 1902 | R.J. Simpson | Micrometer Gage | micrometers | |
| 793,850 | Jul. 04, 1905 | L.S. Starrett, R.J. Simpson | Fast-Action Adjustment for Calipers | calipers | |
| 986,772 | Mar. 14, 1911 | R.J. Simpson | Folding Steel Rule | folding rule joints | |