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. 07, 2012
Filed:
Sep. 24, 2008
Yoshiaki Maeda, Kyoto, JP;
Shuzo Maruyama, Kyoto, JP;
Kenichi Yasunaga, Kyoto, JP;
Shimadzu Corporation, Kyoto, JP;
Abstract
A sample introduction method for reducing carry-over is provided. After a sample introduction device in a total volume injection method draws a proper amount of a sample solution from a sample container and further draws a solution with the same composition as a mobile phase solution with a needle, the needleis inserted into an injection port. When flow paths are switched to communicate a liquid feeder, a sample loop, the needle, the injection port, and a separation/detection section, the solution with the same composition as the mobile phase solution is forced into a gap between the injection portand the needle. Therefore, the samples squeezed out of a tip section of the needleduring the switching of the flow paths are prevented from being forced into the gap between the needleand the injection port