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| Patents for Joseph Clarkson & Son | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 194,221 | Aug. 14, 1877 | F.S. Clarkson | Improvement in cutter-heads for grooving and channeling | |
 | 216,722 | Jun. 24, 1879 | E.H. Clarkson | Mortising-machine | |
 | 216,767 | Jun. 24, 1879 | F.S. Clarkson, F.B. Sloan | Improvement in sash-cord guides | |
 | RE9,221 | Jun. 01, 1880 | E.H. Clarkson | Mortising-machine | |
 | 249,306 | Nov. 08, 1881 | F.S. Clarkson | Mortising-machine | |