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. 26, 1991
Filed:
Jun. 04, 1990
Applicant:
Inventor:
David A Hanna, Boulder, CO (US);
Assignee:
Paradygm Science & Technologies, Inc., Boulder, CO (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
250281 ; 250282 ; 250286 ; 250288 ;
Abstract
The present invention provides a chop mode operated mass spectrometer that substantially reduces the effects of line signals on the operation of the mass spectrometer by admitting gas samples to the analyzer of the mass spectrometer at a frequency that is a sub-multiple of the line frequency. The signal output by the analyzer is sampled at a frequency that is a multiple of frequency at which the gas is being admitted to the analyzer and processed using a digital filter that results in the line signal being isolated from the signal or signals of interest.