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| Patents for Robert Johnson | |||||
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| Number | Date | Patentee | Title | Type | |
| 246,423 | Aug. 30, 1881 | E.H. Sawin | Tenoning-machine | tenoning machines | |
| 271,159 | Jan. 23, 1883 | C. Thompson | Drag-saw | drag saws | |
| CA-38,064 | Jan. 04, 1892 | R. Johnson | Machine Rotatoire, Machine Soufflante, Pompe et Compteur a Eau | rotary steam engines | |
| 1,410,189 | Mar. 21, 1922 | R. Johnson | Calipers, Spring-Calipers and the Like | calipers | |