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| Patents for P. Estes | |||||
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| Number | Date | Patentee | Title | Type | |
| 108,576 | Oct. 25, 1870 | P. Estes | Reciprocating Engine | steam engines | |
| RE4,279 | Feb. 28, 1871 | P. Estes | Improvement in Steam Engines | steam engines | |
| 114,427 | May 02, 1871 | P. Estes | Improvement in Piston-Packings | piston ring and packing | |