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:
Jun. 21, 2016
Filed:
May. 08, 2013
Shimadzu Corporation, Kyoto-shi, Kyoto, JP;
Shinjiro Fujita, Kameoka, JP;
SHIMADZU CORPORATION, Kyoto, JP;
Abstract
In a pause time assigned for switching voltage applied to a quadrupole mass filter or other ion transport optical system so as to switch the mass-to-charge ratio of a target ion in an SIM measurement, the polarity of direct-current voltage applied to a pre-quadrupole mass filter is temporarily reversed. The voltage polarity reversal time is changed according to length of the pause time so that the ion intensity can sufficiently rise by the time the next dwell time begins. When the polarity of the voltage applied to the pre-quadrupole mass filter is reversed, the electric charges which lie on an insulating film of contaminants or other substances attached to the surface of the pre-quadrupole mass filter or on an insulating support structure are dispersed, whereby the charge-up is eliminated. Since ions are prevented from passing through, charge-up of a main quadrupole mass filter in the subsequent stage is also reduced.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile