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| Patents for Donald C. Ridout | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 109,121 | Nov. 08, 1870 | J. Findlay | Improvement in Vises | |
 | CA-830 | Mar. 08, 1871 | J. Findlay | Improvements on adjustable tool stock for lathes | |
 | CA-877 | Mar. 16, 1871 | R. Walker | Improvements on drilling and boring machines | |
 | 209,771 | Nov. 12, 1878 | J. Nesbitt, A. Anderson | Improvements in curtain-rollers | |
| 221,950 | Nov. 25, 1879 | G.S. Woodruff | Gas-governors | ||
 | 225,633 | Mar. 16, 1880 | J. Nesbitt | Electric railway-semaphore | |