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| Patents for Donald C. Ridout | |||||
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| Number | Date | Patentee | Title | Type | |
| CA-830 | Mar. 08, 1871 | J. Findlay | Improvements on adjustable tool stock for lathes | metal lathe accessories and attachments | |
| CA-877 | Mar. 16, 1871 | R. Walker | Improvements on drilling and boring machines | drill presses | |
| 209,771 | Nov. 12, 1878 | J. Nesbitt, A. Anderson | Improvements in curtain-rollers | ||
| 221,950 | Nov. 25, 1879 | G.S. Woodruff | Gas-governors | steam engine governors | |
| 225,633 | Mar. 16, 1880 | J. Nesbitt | Electric railway-semaphore | track and switches | |