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| Patents for P. R. L. Peirce | |||||
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| Number | Date | Patentee | Title | Type | |
| 59,951 | Nov. 27, 1866 | A. Boynton | Improvement in saws | saw teeth | |
| 73,226 | Jan. 14, 1868 | E.M. Boynton | Improvement in saws | saw teeth | |
| 73,227 | Jan. 14, 1868 | E.M. Boynton | Improvement in Saw Tang | crosscut saws | |