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| Patents for J. W. Downing | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,124,311 | Jan. 12, 1915 | C.L. Mattison | Belt sanding-machine | sanding machines | |
| 1,181,330 | May 02, 1916 | C.L. Mattison | Abrading or polishing machine | sanding machines | |
| 1,222,783 | Apr. 17, 1917 | M.W. Mattison | Cutter-head | cutterheads | |