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:
Feb. 18, 1992
Filed:
May. 16, 1991
Applicant:
Inventors:
Alan E Schoen, Santa Clara County, CA (US);
John E Syka, Santa Clara County, CA (US);
Assignee:
Finnigan Corporation, San Jose, CA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ; B01D / ;
U.S. Cl.
CPC ...
250292 ; 250290 ; 250291 ; 250281 ; 250282 ;
Abstract
Apparatus and method for mass analysis with improved resolution in an r.f.-only multipole mass spectrometer by use of a supplemental r.f. field which resonantly renders ions unstable. Further, the r.f. field is frequency modulated and the output signal demodulated for mass analysis.