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| Patents for Thomas Dugan | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 36,832 | Nov. 04, 1862 | F. Brown, A. Brown | Improvement in friction-coupling | |
 | CA-12,302 | Feb. 01, 1881 | F. Brown | Improvement on fog signals | |
 | 274,876 | Mar. 27, 1883 | W. Zerman | Insertable saw-tooth | |
 | 288,807 | Nov. 20, 1883 | R. Hodges | Try Square | |