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| Patents for W. A. Clark & Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 20,192 | May 11, 1858 | W.A. Clark | Method of seating the movable cutter in expansive bits | adjustable drill bits | |
| 21,597 | Sep. 28, 1858 | W.A. Clark | Expansive bit | adjustable drill bits | |
| 24,722 | Jul. 12, 1859 | W.A. Clark | Improved device for fastening cutters of hollow augers | hollow bits | |
| 28,653 | Jun. 12, 1860 | W.A. Clark | Adjustable hollow auger | hollow bits | |