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:
Jun. 13, 1995
Filed:
Dec. 14, 1993
Willi Brand, Stuhr, DE;
Karleugen Habfast, Bremen, DE;
Finnegan Mat GmbH, Bremen, DE;
Abstract
Background of the invention is the isotope ratio analysis of carbon and nitrogen as components of hydrocarbon compounds. The separation into individual components takes place in a gas chromatograph and oxydation in a downstream combustion oven, into, inter alia CO.sub.2 and N.sub.2. In general CO.sub.2 is present in a much larger quantity than N.sub.2. The measurement values on the mass spectrometer have accordingly different dimensions. In order to approximate the peak values, a dilution with additional helium as a carrier gas takes place in the analysis of CO.sub.2. This has the additional advantage that the helium as a carrier gas, which is present anyway, as a result is present in approximately equal quantities relative to the CO.sub.2 and N.sub.2 in the ion source of the mass spectrometer. The dilution takes place in the region of a so-called open split (18).