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:
Mar. 27, 2018
Filed:
May. 24, 2016
Applicant:
Thermo Finnigan Llc, San Jose, CA (US);
Inventor:
Graeme C. McAlister, San Jose, CA (US);
Assignee:
THERMO FINNIGAN LLC, San Jose, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 49/42 (2006.01); H01J 49/10 (2006.01); H01J 49/06 (2006.01);
U.S. Cl.
CPC ...
H01J 49/4215 (2013.01); H01J 49/063 (2013.01);
Abstract
An ion source filter for use in the source region is disclosed. The ion source filter includes four rod electrodes having circular cross sections. The rod electrodes of the ion source filter are sized and positioned such that the ratio r/rof the rod radius to the inscribed circle radius is considerably reduced relative to conventional RF/DC mass filters. The reduced r/rgeometry has been observed to lessen the diminishment of resolution with increasing pressure relative to prior art devices.