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:
Jul. 21, 2026
Filed:
Nov. 08, 2021
Shimadzu Corporation, Kyoto, JP;
Shiro Mizutani, Kyoto, JP;
SHIMADZU CORPORATION, Kyoto, JP;
Abstract
A mass spectrometer includes a mass filter, a wave-detection unit, a cancellation circuit and a power supply device. The mass filter selects ions having a mass-to-charge ratio corresponding to an applied AC voltage. The wave-detection unit has a plurality of rectifiers each of which includes a rectifying device and which are connected in parallel, and detects the AC voltage applied to the mass filter as a wave-detection voltage. The cancellation circuit cancels an offset of the AC voltage caused by a leakage current of the rectifying device. The power supply device applies the AC voltage the offset of which has been canceled by the cancellation circuit to the mass filter based on the wave-detection voltage.