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. 23, 2007
Filed:
Oct. 24, 2002
Applicants:
LI Ding, Cheshire, GB;
Michael Sudakov, Cheshire, GB;
Inventors:
Li Ding, Cheshire, GB;
Michael Sudakov, Cheshire, GB;
Assignee:
Shimadzu Research Laboratory, , GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 49/42 (2006.01);
U.S. Cl.
CPC ...
Abstract
A quadrupole ion trap device has a field adjusting electrode located outside the trapping region adjacent the aperture in the entrance end cap electrode, and optionally adjacent the aperture in the exit end cap electrode. The field adjusting electrode(s) controls field distortion in the vicinity of the apertures. By appropriately setting the voltages on the field adjusting electrodes the efficiency and resolution of operational processes such as ion introduction, precursor ion isolation and mass scanning can be improved.