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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 |
| 7748253 | Vent and soil flux measurement system A method and apparatus are provided for maintaining pressure inside a closed chamber equal to the changing outside pressure, detecting leaks in the plumbing (i.e., air handling system) of a trace gas flux measurement system, and estimating the kinetic volume, e.g., ... | 07/06/2010 |
| 7207224 | Wide-range combination vacuum gauge A combination vacuum gauge provides simultaneous absolute and differential pressure measurements over a wide range of pressures ranging from atmospheric pressures to ultrahigh vacuum by processing the readings from an absolute high vacuum gauge (e.g., an ionization ... | 04/24/2007 |
| 6367308 | Method of measuring the density of a dielectric gas in a buried metal-clad line A method of measuring the density of a dielectric gas under pressure in a buried metal-clad electricity line consists in measuring the pressure and the temperature of the dielectric gas by means of a sensor mounted on the case of the line, and in compensa... | 04/09/2002 |
| 6209387 | System and method for determining thermodynamic properties Disclosed is a system and method for determining the thermodynamic properties and percentage of each component of a multi-component gas medium by using speed of sound in conjunction with other data. The present system comprises a computer system with mean... | 04/03/2001 |
| 6148659 | Gas concentration monitor having a bridge configured flow system A gas concentration monitor has a pneumatic bridge having two parallel flowpaths containing a first conduit leg and a second conduit leg connected to an input line. Each leg has an entry orifice and an exit orifice through which a portion of the gas sampl... | 11/21/2000 |
| 6125692 | Density sensor for monitoring the rate of leakage from a switchgear case with improved reliability A density sensor for monitoring a rate of leakage from the case of electrical switchgear filled with dielectric gas under pressure, the sensor comprising a fixing support mounted from the outside in the thickness of the case and communicating with the die... | 10/03/2000 |
