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| Patents for D. P. Cowl | |||||
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| Number | Date | Patentee | Title | Type | |
| 125,695 | Apr. 16, 1872 | R.S. Sanborn | Improvement in Wrenches | ratchet wrenches | |
| 195,993 | Oct. 09, 1877 | M.L. Edwards | Metal Drilling Machine | drill presses | |
| 216,776 | Jun. 24, 1879 | Q.S. Backus | Bit-stock wrenches | brace chucks | |
| 231,344 | Aug. 17, 1880 | J.H. Needles | Combined apparatus for producing illuminating gas and generating steam | stationary boilers | |
| 310,774 | Jan. 13, 1885 | D.L. Ballard | Reversing Gear for Shaping Machines | metalworking machine mechanisms | |