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| Patents for Plessisville Foundry | |||||
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| Number | Date | Patentee | Title | Type | |
| 429,807 | Jun. 10, 1890 | P.D. Dupont | Power-hammer spring | drop hammers | |
| CA-36,927 | Jul. 04, 1891 | P.D. Dupont | Coil spring power hammer | drop hammers | |
| 642,070 | Jan. 30, 1900 | E.H. Blossom | Power-hammer | drop hammers | |
| 1,431,434 | Oct. 10, 1922 | O. Tardif | Sawing machine | circular sawmills | |
| 1,748,906 | Feb. 25, 1930 | O. Tardif, L. Carrier | Lath machine | lath making machines | |