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:
Mar. 18, 2008
Filed:
Jun. 08, 2004
Applicants:
Paul Grant Wynn, Broxted, GB;
James Andrew Breach, Hertfordshire, GB;
Inventors:
Paul Grant Wynn, Broxted, GB;
James Andrew Breach, Hertfordshire, GB;
Assignee:
Smiths Detection-Watford Limited, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 49/40 (2006.01);
U.S. Cl.
CPC ...
Abstract
An ion mobility spectrometer system includes two cells () and () driven by a drive unit () so that the cells operate at opposite polarities and are switched between different polarities either at regular intervals or in response to detection of a substance in one cell. Two reagents are supplied to both cells () and (), one promoting detection of a substance in the positive mode and the other promoting detection of a substance in the negative mode so that there is no need to switch reagents when the polarity changes.