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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 |
| 4352087 | Fume detector and alarm system A fume detector including a gas sensor having a heater element and a variable impedance element associated therewith whose impedance decreases in the presence of toxic gases or fumes, or a decrease of free oxygen in an atmosphere being monitored. A load r... | 09/28/1982 |
| 4350913 | Magnetic particle devices A housing for magnetic particle devices comprising first and second housing members adopted to be assembled in side-by-side axial relation, at least one of said housing members having an annular cavity formed extending inwardly on one side thereof adjacen... | 09/21/1982 |
| 4347993 | Tension monitor means and system A tension control system for use with a device which includes at least one roll over or around which a web or strand of material passes, a tension responsive transducer associated with the roll, a reference tension selector, a drive unit for effecting mov... | 09/07/1982 |
