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. 01, 2003
Filed:
Mar. 02, 2001
Robert Harold Bateman, Knutsford, GB;
John Brian Hoyes, Stockport, GB;
Micromass Limited, Manchester, GB;
Abstract
An improved method of parent ion scanning is disclosed. In one embodiment a quadrupole mass filter upstream of a collision cell is arranged to operate in a highpass mode. Parent ions transmitted by the mass filter are fragmented in the collision cell and detected by an orthogonal time of flight analyser which obtains a daughter ion mass spectrum. Ions having a mass to charge ratio below the cutoff of the mass filter are identified as daughter ions, and candidate parent ions may then be discovered and their identity confirmed by obtaining corresponding daughter ion spectra. In a second embodiment, the collision cell alternates between high and low fragmentation and candidate parent ions can additionally be identified on the basis of the loss of a predetermined ion or neutral particle.