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| Patents for Portland Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 25,588 | Sep. 27, 1859 | J. Sparrow | Riveting, Punching and Shearing Machine | |
 | 753,178 | Feb. 23, 1904 | F.E. Thomes | Core-box cutter | |
| 1,420,591 | Jun. 20, 1922 | F.E. Thomes | Woodworking machine | ||
 | 1,593,317 | Jul. 20, 1926 | F.E. Thomes | Woodworking machine | |