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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 |
| 7263836 | Vortex tube cooling system Systems and methods for cooling a component within a housing adapted for subsurface disposal using a vortex tube. The housing contains a first pressure chamber; a vortex tube coupled to the first pressure chamber; a cooling chamber coupled to the vortex tube; and a ... | 09/04/2007 |
| 7215125 | Method for measuring a formation parameter while inserting a casing into a wellbore A system for determining a subsurface parameter from a drilled wellbore includes a casing, a logging tool comprising one or more logging devices, and a latching device coupling the logging tool to the casing such that the logging tool hangs below the casing when the... | 05/08/2007 |
| 7188685 | Hybrid rotary steerable system A bottom hole assembly is rotatably adapted for drilling directional boreholes into an earthen formation. It has an upper stabilizer mounted to a collar, and a rotary steerable system. The rotary steerable system has an upper section connected to the collar, a steer... | 03/13/2007 |
