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| Patents for William T. Porter | |||||
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| Number | Date | Patentee | Title | Type | |
| 175,159 | Mar. 21, 1876 | T.S. Poole | Lathe for Turning Rolls | metal lathe chucks | |
| RE7,240 | Jul. 25, 1876 | J.M. Poole | Machines for Grinding Rollers | profile and contour grinders | |
| RE7,978 | Dec. 04, 1877 | J.M. Poole | Machine for Grinding Objects Cylindrically | cylindrical grinders | |