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