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| Patents for W. P. Duncan & Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 237,872 | Feb. 15, 1881 | W.R. Jenkins, Jr. | Power Hammer | power hammers | |
| 358,672 | Mar. 01, 1887 | W.R. Jenkins, Jr. | Power Hammer | power hammers | |
| 370,260 | Sep. 20, 1887 | W.R. Jenkins, Jr. | Power Hammer | power hammers | |