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:
Jan. 25, 2005
Filed:
May. 19, 2003
Yoshikatsu Umemura, Kyoto-fu, JP;
Yoshikatsu Umemura, Kyoto-fu, JP;
Shimadzu Corporation, Kyoto, JP;
Abstract
In an ion trap mass spectrometer including a ring electrode and a pair of end cap electrodes placed opposite each other with the ring electrode therebetween, where an ion trap space is defined by the ring electrode and the pair of end cap electrodes, the frequency determining section of the controller determines a plurality of frequencies or a plurality of frequency channels each corresponding to a mass to charge ratio of an ion to be selected. The wide-band RF signal generator generates a wide-band RF signal having a plurality of notches each corresponding to each of the plurality of frequencies or the plurality of frequency channels. Then the voltage controller applies a voltage corresponding to the wide-band RF voltage to the pair of end cap electrodes, whereby ions having mass to charge ratios corresponding to the frequencies or frequency channels remain in the ion trap space but other ions are ejected from the ion trap space.