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:
Oct. 27, 1992
Filed:
Sep. 06, 1991
Philip Marriott, Macclesfield, GB;
Anthony M Jones, Nantwych, GB;
Robert S Taylor, Macclesfield, GB;
VG Instruments Group Limited, Uxbridge, GB;
Fisons Instruments, Uxbridge, GB;
Abstract
A method of mass spectrometry and a mass spectrometer for the analysis of a sample, the mass spectrometer comprising means for producing ions from the sample and a magnetic sector for analyzing the ions, wherein the magnetic field of the magnetic sector is generated by passage of a magnet current controlled by a digital control signal representative of a sequence of integers generated by a computer. According to the invention, means are provided for generating the magnet current in exponential relation to the sequence of integers. In contrast to prior spectrometers, the invention provides peak switching and mass selection across the mass range with a constant number of integer steps per mass peak, thereby facilitating the digital selection of any particular mass peak, particularly those at low mass.