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| Patents for Peter T. Coffield | |||||
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| Number | Date | Patentee | Title | Type | |
| 428,803 | May 27, 1890 | P.T. Coffield | Tap | taps and dies | |
| 456,284 | Jul. 21, 1891 | C.H. Paxson, P.T. Coffield | Gas Engine | gas and gasoline engines | |
| 579,789 | Mar. 30, 1897 | P.T. Coffield | Gas Engine | internal combustion engine governors | |