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:
Nov. 23, 2004
Filed:
Sep. 25, 2002
Jun Xu, Knoxville, TN (US);
J. Michael Ramsey, Knoxville, TN (US);
William B. Whitten, Oak Ridge, TN (US);
UT-Battelle LLC, Oak Ridge, TN (US);
Abstract
A method and apparatus is disclosed for flowing a sample gas and a reactant gas ( ) past a corona discharge electrode ( ) situated at a first location in an ion drift chamber ( ), applying a pulsed voltage waveform comprising a varying pulse component and a dc bias component to the corona discharge electrode ( ) to cause a corona which in turn produces ions from the sample gas and the reactant gas, applying a dc bias to the ion drift chamber ( ) to cause the ions to drift to a second location ( ) in the ion drift chamber ( ), detecting the ions at the second location ( ) in the drift chamber ( ), and timing the period for the ions to drift from the corona discharge electrode to the selected location in the drift chamber.