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:
Aug. 23, 1994
Filed:
Mar. 19, 1993
Shimadzu Corporation, Kyoto, JP;
Abstract
A gas chromatograph for operation in split mode is controlled by calculating the column flow rate and the total carrier gas flow rate from the length and inner diameter of the column and specified values for temperature and column inlet pressure, adjusting the split flow rate such that the pressure value measured by a pressure sensor becomes equal to the specified pressure value and control the total carrier flow rate to be equal to the calculated value therefor. In this manner, the split ratio of the gas chromatograph can be maintained easily at a specified value. The amount of carrier gas to be wasted can be significantly reduced by appropriately varying the split ratio with time during the course of an analysis.