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. 21, 1997
Filed:
Apr. 15, 1996
Hiroaki Waki, Kyoto, JP;
Shimadzu Corporation, , JP;
Abstract
A mass spectrometric apparatus receives a liquid sample from a liquid chromatograph, ionizes it under an atmospheric condition and guides these ions from the liquid sample along a specified trajectory through one or more intermediate vacuum chambers to a mass analyzer kept inside a high vacuum chamber. At least one of these intermediate vacuum chambers is kept in an intermediate vacuum condition in the so-called viscous flow region and contains at least one pair of mutually separated planar electrodes sandwiching the trajectory. Voltages of the same polarity as that of the ions which are passed through are adjustably applied to the electrodes so as to form a converged ion beam and also to control its trajectory. Two mutually perpendicular pairs of such electrodes may be disposed across the trajectory. Two sets each with two such pairs of electrodes may be disposed across the trajectory.