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:
Jul. 17, 2012
Filed:
Oct. 22, 2007
Applicant:
William Angus Munro, Watford, GB;
Inventor:
William Angus Munro, Watford, GB;
Assignee:
Smiths Detection-Watford Limited, Hertfordshire, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 49/10 (2006.01); H01J 49/40 (2006.01);
U.S. Cl.
CPC ...
Abstract
An ion mobility spectrometer has several electrodes spaced along its ion source region. Voltages are applied to the electrodes to produce a voltage gradient along the length of the ion source region. By varying the voltage gradient, the residence time of ions in the ion source region can be selectively varied. Typically, the spectrometer is arranged to reduce the residence time in response to a decrease in the amplitude, of an ion peak detected at the far end of the drift region.