Use of conductive glass tubes to create electric fields in...

Radiant energy – Ionic separation or analysis – Ion beam pulsing means with detector synchronizing means

Reexamination Certificate

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C250S281000, C250S287000, C250S288000

Reexamination Certificate

active

07081618

ABSTRACT:
An ion mobility spectrometer is described in which the reaction-ionization chamber and/or the ion drift chamber are constructed with one or more single-piece glass tubes. The inner surface of the tube is rendered electrically conductive by thermal and/or chemical treatment thereof. The glass tube(s) are used in place of the stack assemblies of metal and ceramic annular components that typically used in such devices. The use of the glass tube(s) provides a significant reduction in the number of parts used in such spectrometers, simplification in their manufacture, and improvements in their performance and reliability.

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“Resistive Glass Products”, Product Data Sheets EP111 (Dec. 2003), © Burle Technologies, Inc., Lancaster, PA.
Gary Alan Eiceman et al., “Ion Mobility Spectrometry”, pp. 88-118, CRC Press, Inc., 1994.
Bruce N. Laprade, “The Development of Novel Resistive Glass Technology to Simplify Reflectron Lens, Ion Guide, Drift Tubes and Ion Source Designs in Mass Spectrometers”; Abstract and slides from presentation held at The 2004 Pittsburgh Conference, Mar. 7, 2004.

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