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| Patents for William M. Porter | |||||
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| Number | Date | Patentee | Title | Type | |
| 230,514 | Jul. 27, 1880 | A.A. Wilder | Safety-governor for elevators, &c. | elevators and lifts | |
| 248,539 | Oct. 18, 1881 | A.A. Wilder | Safety attachment and governor for elevators | elevators and lifts | |
| 250,367 | Dec. 06, 1881 | I. Kinney | Wrench & Pipe Cutter | pipe and nut combination wrenches | |