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To: donpat who wrote (252)	6/9/2005 11:05:32 PM
From: donpat	Read Replies (1) \| Respond to of 1970

United States Patent 6,870,155 Krasnobaev , et al. March 22, 2005 -------------------------------------------------------------------------------- Modified vortex for an ion mobility spectrometer 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. -------------------------------------------------------------------------------- Inventors: Krasnobaev; Leonid Ya. (Newton, MA); Bunker; Stephen N. (Wakefield, MA) Assignee: Implant Sciences Corporation (Wakefield, MA) Appl. No.: 818434 Filed: April 5, 2004 patft.uspto.gov This patent relating to the 'tornado' or 'vortex' flow feature was the subject of this Implant Sciences PR: phx.corporate-ir.net