Patent application number | Description | Published |
20090100942 | AUTOMATIC SAMPLER AND METHOD FOR INJECTING SAMPLE - After a sampling needle is moved to a position above a sample container, the sampling needle is moved down so that the tip of the sampling needle penetrates a septum, and is then preferably moved down to a position at which the tip of the sampling needle is not brought into contact with a sample contained in the sample container, and then, the sampling needle is once elevated until the sampling needle is pulled out of the septum, and is then again moved down to penetrate the septum until the tip of the sampling needle is inserted into the sample to suck the sample through a suction port of the sampling needle, and then, the sampling needle is moved to a sample injection port of an analyzer to inject the sample into the analyzer. | 04-23-2009 |
20100107783 | AUTO-SAMPLER - The influence of contamination or carry-over can be reduced even if a mobile phase flows in an analysis flow channel at a low flow rate. A surface of a flow channel ( | 05-06-2010 |
20100206411 | SAMPLE INTRODUCTION DEVICE - A sample introduction device for reducing carry-over is provided. In the sample introduction device, when a high pressure valve | 08-19-2010 |
20100326215 | SAMPLE INTRODUCTION METHOD - 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 | 12-30-2010 |
20110209532 | AUTOMATIC SAMPLER FOR LIQUID CHROMATOGRAPH - A pump portion for taking in and discharging solutions includes a first plunger pump with a small capacity and a second plunger pump with a large capacity. Intake ports of both the plunger pumps are connected in parallel to a common port of a switching valve with a first three-way valve interposed therebetween. The first three-way valve connects the intake port of one of the plunger pumps to the switching valve. Discharge ports of both the plunger pumps are connected in parallel to one port of the switching valve with a second three-way valve interposed therebetween. The second three-way valve connects the discharge port of one of the plunger pumps to the switching valve. | 09-01-2011 |
20110247405 | Sample Injection Port and Auto-Sampler Having the Same - A sample injection port | 10-13-2011 |
20120024048 | LIQUID CHROMATOGRAPH - In injecting a sample sucked into a sample loop in an autosampler from an injection needle into an analytical flow path via an injection port by a mobile phase, a sending flow rate of the mobile phase is reduced from a certain flow rate determined in an analysis condition to reduce pressure applied on a joint section between the needle and the injection port to thereby reduce the sample remaining in the injection port. | 02-02-2012 |
20120111127 | Autosampler - An autosampler is provided with a needle, a measuring pump which sucks and discharges liquid through the needle, a movement mechanism for the needle, and an injection port which has a needle sealing surface. A sample liquid is sucked into the needle and then the sample liquid discharged with the tip of the needle pressed to the needle sealing surface. When cleaning the needle sealing surface, a cleaning liquid in within the injection port is sucked and then the cleaning liquid is discharged and sucked into the injection port at a position at which the tip of the needle does not make contact with the needle sealing surface. Alternatively, after the cleaning liquid is discharged into the injection port, the needle may be caused to perform an up and down motion such that the tip of the needle contacts the needle sealing surface and then is lifted. | 05-10-2012 |
20120118141 | PLUNGER-TYPE MEASURING PUMP - A plunger-type measuring pump in which a pump head | 05-17-2012 |
20130233060 | SOLVENT DELIVERY DEVICE AND LIQUID CHROMATOGRAPH - A solvent delivery device comprises a solvent delivery pump and a flow path switching valve. The flow path switching valve is connected to downstream ends of mobile phase sending flow paths and the solvent delivery pump is to be connected to one of the mobile phase sending flow paths by switching the flow path switching valve. At least one of the mobile phase sending flow paths includes a buffer solution sending flow path, and the buffer solution sending flow path includes a buffer solution storage section, a cleaning solution storage section, and a mobile phase switching valve for switching connection of the flow path switching valve to one of the storage sections. | 09-12-2013 |
20140260565 | LIQUID FEED PUMP AND LIQUID CHROMATOGRAPH - A recess into which a protrusion of a plunger seal is to be fitted is provided at a part of a pump head where a plunger is to be inserted into a pump chamber. The plunger seal seals the pump chamber by an outer circumferential surface of the protrusion coming into close contact with an inner circumferential surface of the recess and a surface of a flange on the side of the protrusion coming into close contact with a circumferential edge surface of the recess of the pump head due to the protrusion being fitted into the recess and being pressed by a backup ring toward the pump chamber. The inner circumferential surface of the recess of the pump head and the circumferential edge surface of the recess are covered by a film of an acid-resistant material. | 09-18-2014 |
20140352827 | FLOW PATH SWITCHING VALVE - A base and a stator forming a housing are joined by a stator position adjustment member. The adjustment member is a ring-shaped member having an inner diameter that is equal to the outer forms of the base and the stator, and threads opposite to each other are provided to an upper portion and a lower portion of the inner circumferential surface, along the circumferential direction. A thread for being screwed with the thread is provided, in the circumferential direction, to each of an upper portion of an outer circumferential surface of the base and a lower portion of an outer circumferential surface of an outer wall member of the stator. When the adjustment member is rotated, the base and the stator move in the direction of separating from each other or in the direction of coming close to each other. | 12-04-2014 |