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| Patents for C. H. Douglas | |||||
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| Number | Date | Patentee | Title | Type | |
| 107,671 | Sep. 27, 1870 | F. Douglas | Improvement in blind-slat tenoning-machines | tenoning machines | |
| 142,761 | Sep. 16, 1873 | S.H. Bellows | Machinists' Gages | special purpose gauges | |
| 165,271 | Jul. 06, 1875 | S. Stone | Improvement in Grappling-Tongs | pliers type wrenches | |