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| Patents for William Porteous | |||||
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| Picture | Number | Date | Patentee | Title | |
| 427,902 | May 13, 1890 | W. Porteous | Lathe Tool | ||
| 427,903 | May 13, 1890 | W. Porteous | Automatic Screw Cutting Die | ||
| 756,405 | Apr. 05, 1904 | W. Porteous | Milling-Machine | ||
| 852,346 | Apr. 30, 1907 | W. Porteous | Milling-Machine | ||
| 867,076 | Sep. 24, 1907 | W. Porteous | Horizontal Reaming, Tapping, and Facing Machine | ||
| 867,077 | Sep. 24, 1907 | W. Porteous | Reaming and Tapping Machine | ||