Radiant energy – Ionic separation or analysis – Methods
Reexamination Certificate
2005-03-22
2005-03-22
Lee, John R. (Department: 2881)
Radiant energy
Ionic separation or analysis
Methods
C250S282000, C250S287000
Reexamination Certificate
active
06870155
ABSTRACT:
The presence of trace molecules in air is often determined using a well-known device called an ion mobility spectrometer. Such devices are commonly utilized in the fields of explosives detection, identification of narcotics, and in applications characterized by the presence of very low airborne concentrations of organic molecules of special interest. The sensitivity of such instruments is dependent on the method of gas sampling utilized. The vortex sampling nozzle consists of an intake gas flow and a separate coaxial heated, emitted gas flow that is deflected to move with a circular motion. A heated vortex sampling nozzle can greatly improve the sampling efficiency for low volatility target molecules, particularly when the sampling needs to be performed at a distance from the air intake and the vapor pressure of the target molecules is very low. Additionally, the vortex air may contain one or more additional substances that promote vaporization, combine with the target molecule, or provide a known marker in the ion mobility time-of-flight spectrum.
REFERENCES:
patent: 4551624 (1985-11-01), Spangler et al.
patent: 5200614 (1993-04-01), Jenkins
patent: 6073499 (2000-06-01), Settles
patent: 6236042 (2001-05-01), Kato et al.
patent: 6586732 (2003-07-01), Lee et al.
patent: 20030193338 (2003-10-01), Krasnobaev et al.
U.S. Appl. No. 10/890,820 filed Jul. 14, 2004, Flash Vapor Sampling for a Trace Chemical Detector, Belyakov et al.
U.S. Appl. No. 10/853,563 filed May 25, 2004, Pulsed Vapor Desorber, Belyakov et al.
Bunker Stephen N.
Krasnobaev Leonid Ya.
Choate Hall & Stewart
Fernandez Kalimah
Implant Sciences Corporation
Lee John R.
LandOfFree
Modified vortex for an ion mobility spectrometer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Modified vortex for an ion mobility spectrometer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modified vortex for an ion mobility spectrometer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3451079