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:
Apr. 19, 1994
Filed:
Mar. 25, 1992
Applicant:
Inventors:
Kevin L Siefering, Cary, NC (US);
Walter H Whitlock, Chapel Hill, NC (US);
Assignee:
The BOC Group, Inc., Murray Hill, NJ (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
250282 ; 250281 ; 250288 ;
Abstract
The present invention provides a method of analyzing a gas sample for trace impurity concentration by atmospheric pressure ionization mass spectroscopy. In accordance with the present invention, moisture is removed from the gas sample before analysis by passing the gas sample through a dried bed of silica gel. The bed of silica gel is sufficiently dried so that remaining moisture present in the gas sample after passage through the bed is at a sufficiently low concentration such that the trace impurity concentration as analyzed by atmospheric ionization mass spectroscopy will not be effected by the remaining moisture.