The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 01, 2001
Filed:
Jul. 30, 1998
Robert Brian Turner, Chesham, GB;
Stephen John Taylor, Amersham, GB;
Alastair Clark, Watford, GB;
Paul Douglas Arnold, Bedford, GB;
Graseby Dynamics Limited, , GB;
Abstract
An ion mobility spectrometer comprises an ion mobility cell (,) into which molecules of a sample to be analysed are introduced. The ion mobility cell (,) is doped with ions produced by a corona discharge ionisation source (,). In one mode of operation, the corona discharge ionisation source (,) operates to produce a continual dopant stream, and in a second mode of operation, the corona discharge ionisation source (,) produces dopant ions selectively. In the non-continuous mode of operation, the ion mobility cell (,) may be doped with chemical dopant ions instead, switching between the two dopant regimes being accomplished very rapidly. The ion mobility spectrometer is particularly suitable for the detection of explosive compounds and narcotics, the ion mobility spectrum of explosives doped with ions from the corona discharge ionisation source differing from the ion mobility spectrum of such explosive compounds doped with chemical dopants.