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| Patents for William Ritchie | |||||
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| Number | Date | Patentee | Title | Type | |
| 83,982 | Nov. 10, 1868 | W. Ritchie, A.C. Martin | Improvement in head-blocks | sawmill headblocks | |
| 100,072 | Feb. 22, 1870 | W. Ritchie | Improvement in Instruments for Drawing Geometrical Lines | compasses | |
| RE7,242 | Jul. 25, 1876 | S.N. Brown, H.W. Meyer | Improvement in feed and pressure rollers for planing-machines | wood planers | |