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:
Nov. 21, 1995
Filed:
Dec. 12, 1994
Applicant:
Inventors:
Kazuya Nakagawa, Kyoto, JP;
Toyoaki Fukushima, Uji, JP;
Assignee:
Shimadzu Corporation, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01D / ; G01N / ;
U.S. Cl.
CPC ...
73 23350 ; 73 23420 ; 95 19 ; 422 89 ; 422 99 ;
Abstract
A target pressure is calculated by a fluid dynamic theory using a length of the column, an inner diameter of the column and the temperature of the column so that the linear velocity of the gas flowing through the column is at a preset pre-determined value at which the HETP (height equivalent to a theoretical plate) value, as calculated from chemical kinematic theory, is the minimum and the resolution of the column is the highest. Then the pressure of the gas at the entrance of the column of a chromatograph is maintained at the calculated target pressure while the temperature of the column is raised to reduce the analyzing time.