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:
May. 05, 2026
Filed:
Dec. 29, 2023
Shimadzu Corporation, Kyoto, JP;
Manabu Ueda, Kyoto, JP;
Shin Fujita, Kyoto, JP;
Junichi Taniguchi, Kyoto, JP;
Shinjiro Fujita, Kyoto, JP;
Shiro Mizutani, Kyoto, JP;
Abstract
A quadrupole mass filter () has a main-rod section () including rod electrodes arranged around a central axis C and a first pre-rod section () including pre-rod electrodes. Along with an RF voltage having a frequency corresponding to the m/z of an ion, DC voltage is applied to the pre-rod electrodes. The DC voltage and the amplitude of the RF voltage are determined so that a-value and q-value substantially satisfy the conditions that a≠0, (π−βx·π)N={(½)+m}π and βy·π·N={(½)+n}π, where m, n and N are natural numbers, with the X-axis direction connecting the centers of two rod electrodes facing each other across the central axis in a plane perpendicular to the central axis, the Y-axis direction connecting the centers of the other two rod electrodes in the plane, and βx and βy representing β values (0<β<1) related to a secular oscillation of an ion in the X and Y directions, respectively.