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| Patents for Walter R. Johnson | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,294 | Apr. 10, 1849 | H. Knowles | Planing-machine | wood planers | |
| 6,380 | Apr. 24, 1849 | G. Hatheway | Sawmill with cylindrical saws | cylindrical saws | |
| 6,443 | May 08, 1849 | H. Law | Machinery for dressing staves | cooper | |
| 7,543 | Aug. 06, 1850 | H. Carver | Scraper Plane with a Frame Body | scraper planes | |
| 7,755 | Nov. 05, 1850 | J. Judson, A. Judson | Valve for Governors | steam engine governors | |