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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 7303367 | Lock nut system A lock nut system includes a molded nut having a plurality of teeth and a molded keeper having a plurality of keeper teeth engageable with the plurality of teeth to inhibit movement of the keeper relative to the nut when the plurality of teeth engages the plurality ... | 12/04/2007 |
| 6213885 | Castellated flange nut A combined castellated and flange nut has a flange with a flat or conical underside, a clamping section with a conical internal thread and several axially parallel recesses, and a torque receiving second section between the clamping section and the flange... | 04/10/2001 |
