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:
Jan. 18, 1977
Filed:
Jul. 15, 1975
Gilbert Blu, Pau, FR;
Flavien Lazarre, Pau, FR;
Societe Nationale des Petroles d'Aquitaine, Courbevoie, FR;
Abstract
This invention concerns a method of analysis by liquid-phase chromatography with programmed elution gradient. According to this method, two chromatography columns, of at least approximately similar porous volume and permeability, are each fed with a mixture of two solvents, in such a way that at any point in time the concentration of one of the solvents at the inlet to the first column is the same as the concentration of the other solvent at the inlet to the second column; the substance for analysis is injected into the inlet of one of the two columns; and the fluids leaving both columns are added to each other to form a mixture for analysis in a concentration detector. The main purpose of the method is to ensure better analysis of petroleum cuts.