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| Patents for John L. Knowlton | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 40,344 | Oct. 20, 1863 | J.L. Knowlton | Improved sawing machine | |
 | RE2,072 | Sep. 12, 1865 | J.L. Knowlton | Improvement in sawmills | |
 | 73,536 | Jan. 21, 1868 | J.L. Knowlton | Improvement in circular-saw mills | |
 | 76,471 | Apr. 07, 1868 | J.L. Knowlton | Improvement in sawmills | |
 | 106,374 | Aug. 16, 1870 | J.L. Knowlton | Improvement in lath-machine | |
 | 157,843 | Dec. 15, 1874 | J.L. Knowlton | Improvement in saw-mills | |
 | 162,392 | Apr. 20, 1875 | J.L. Knowlton | Improvement in saw-sharpening machines | |