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| Patents for William J. Clark | |||||
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| Picture | Number | Date | Patentee | Title | |
| 153,663 | Aug. 04, 1874 | W.J. Clark, A.O. Kittredge, W.H. Clark | Mallets for Smothing Sheet Metal | ||
| 166,703 | Aug. 17, 1875 | W.J. Clark, W.H. Clark, A.O. Kittredge | Mallets for Smoothing Sheet Metal | ||
 | 313,735 | Mar. 10, 1885 | G.H. Hill | Expansible bit | |
 | 524,192 | Aug. 07, 1894 | W.J. Clark, W.H. Clark | Mortising machine | |