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| Patents for Douglas Dyrenforth | |||||
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| Number | Date | Patentee | Title | Type | |
| 245,634 | Aug. 16, 1881 | C.S. Harmon, T.J. Jenne | Lifting-jack | lifting jacks | |
| 313,924 | Mar. 17, 1885 | T.E. Daniels | Chain mortising-machine | mortising machines | |
| 381,870 | Apr. 24, 1888 | A. Worthington | Boiler | stationary boilers | |