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| Patents for John G. Center | |||||
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| Number | Date | Patentee | Title | Type | |
| 238,935 | Mar. 15, 1881 | W.J. Liddell | Piston-packing | piston ring and packing | |
| 238,936 | Mar. 15, 1881 | W.J. Liddell | Head-block for saw-mills | sawmill headblocks | |
| 240,031 | Apr. 12, 1881 | W.J. Liddell | Straw-burning furnace | industrial furnaces | |
| 241,384 | May 10, 1881 | W.J. Liddell | Hay and cotton press | cotton presses | |