...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 |
| 7830456 | System and method for frequency multiplexing in double-conversion receivers A system and method for frequency conversion in a frequency-conversion receiver is disclosed. The frequency-conversion receiver receives input RF signals carrying multiple channels. The frequency-conversion receiver converts the input RF signals to a wide IF band. T... | 11/09/2010 |