...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 |
| 7579080 | Modified pigment-based inks and method of making modified pigment-based inks Briefly described, embodiments of this disclosure include chemicals, modified pigments, and methods of preparing a modified pigment. ... | 08/25/2009 |