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. 18, 2009
Filed:
Apr. 11, 2007
Yosuke Iwata, Kyoto, JP;
Yosuke Iwata, Kyoto, JP;
Shimadzu Corporation, Kyoto, JP;
Abstract
A flow path switching valve is provided, in which an impact due to the pressure change when a flow path is switched is prevented from being generated. (A) A rotor slotallows an analysis infusion pumpto be connected to an analytical column, so as to form a flow path (condensing procedure). (B) The rotor of the flow path switching valveis rotated clockwise for 30 degrees, the rotor slotallows the analysis infusion pump, the analytical column, and a trap columnbe connected. After the pressure in the trap columnis raised to the same pressure level as that of the analytical column, the pressure is stabilized, and the pressure difference between the two columnsandis counteracted (high-pressure procedure). (C) After the pressure between the two columnsandhas been stabilized sufficiently, the rotor is further rotated for 30 degrees, and the trap columnand the analytical columnare connected in series, so the sample analysis can be performed (dissolution procedure and detection procedure).