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| Patents for David Farquhar | |||||
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| Number | Date | Patentee | Title | Type | |
| 257,994 | May 16, 1882 | D. Farquhar, R.W. Aitken | Valve Gear for Steam Engines | steam engine valve gear | |
| 741,472 | Oct. 13, 1903 | A.W. Aitken, D. Farquhar | Stoker for Threshing or Other Engines | solid fuel stokers | |
| 905,073 | Nov. 24, 1908 | D. Farquhar, C.F. Henn | Scraper for Road Rollers | road scrapers | |
| 914,256 | Mar. 02, 1909 | D. Farquhar | Steam Engine | steam rollers | |
| 939,877 | Nov. 09, 1909 | D. Farquhar, M.J. Todd | Road Roller | steam rollers | |