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. 27, 2007
Filed:
Apr. 29, 2003
Anatoli N. Verentchikov, St. Petersburg, RU;
Anatoli N. Verentchikov, St. Petersburg, RU;
LECO Corporation, St. Joseph, MI (US);
Abstract
To provide comprehensive MS—MS analysis, a time-nested separation is employed using two time-of-flight (TOF) mass spectrometers. Parent ions are separated in a slow and long TOF, operating at low ion energy (1 to 100eV), and fragment ions are mass analyzed in a fast and short TOF, operating at much higher keV energy. A low energy fragmentation cell between TOFand TOFis tailored to accelerate fragmentation and dampening steps, mostly by shortening the cell and employing higher gas pressure. Slow separation in TOFbecomes possible with an introduction of novel TOFanalyzers. Higher performance is expected with the use of novel hybrid TOFanalyzers, combining radio frequency (RF) and quadratic DC fields. An RF field retains low-energy ions within a TOFanalyzer, while a quadratic DC field improves resolution by compensating for a large relative energy spread.