1
Fred Strohmeier, Klaus Witt: Pumping apparatus for delivering liquid at high pressure. Richard F Schuette, November 28, 1989: US04883409 (78 worldwide citation)

A pumping apparatus for delivering liquid at a high pressure, in particular for use in liquid chromatography, comprises two pistons (10, 20) which reciprocate in pump chambers (7,18), respectively. The output of the first pump chamber (7) is connected via a valve (13) to the input of the second pump ...


2
Hans Peter Zimmermann, Fred Strohmeier, Klaus Witt: Apparatus for handling liquid vials in an analytical device. Hewlett Packard Company, June 13, 1995: US05424037 (18 worldwide citation)

An apparatus for handling liquid vials in an analytical device comprises a single movable tray for accommodating a plurality of vials, and lifting devices arranged in the proximity of the tray for lifting vials out of the tray. The tray has a plurality of recesses for holding the vial. The recesses ...


3
Klaus Witt, Monika Dittmann, Friedrich Bek: Microfluidic system. Agilent Technologies, July 17, 2007: US07243670 (11 worldwide citation)

A microfluidic system, particularly a microfluidic chip, with at least one operational channel, in which a fluid and/or the constituents contained therein are moveable in the direction of the operational channel by a driving force, particularly by using pressure, acoustic energy, or an electrical an ...


4
Werner Schneider, Klaus Witt: Apparatus for controlling the temperature of the mobile phase in a fluid chromatograph. Hewlett Packard Company, August 24, 1993: US05238557 (9 worldwide citation)

Apparatus for controlling the temperature of a mobile phase in a fluid chromatographic system are provided which comprise both an ingoing capillary connected to an inlet of a column and an outgoing capillary connected an outlet of the column. A portion of the ingoing capillary and a portion of the o ...


5
Werner Schneider, Klaus Witt: Method and apparatus for injecting liquid into a capillary tube. Hewlett Packard Company, October 25, 1994: US05358613 (7 worldwide citation)

In a method and a corresponding apparatus for injecting liquid from a vial into a capillary tube, in particular in capillary electrophoresis, a source of overpressure and a source of underpressure are connectable to the vial for applying overpressure or underpressure in the space above the liquid. D ...


6
Klaus Witt: Method and apparatus for analyzing a mixture of sample substances. Agilent Technologies, October 10, 2006: US07118660 (4 worldwide citation)

An apparatus for analyzing a mixture of sample substances comprises a fluid-guiding structure wherein the sample substances are moving essentially in one dimension along the structure and are subject to at least two separation mechanisms, such as capillary electrochromatography (CEC) and capillary z ...


7
Klaus Witt, Konstantin Choikhet, Alexander Bierbaum: Solvent supply with correction of piston movement. Agilent Technologies, Marc Bobys, March 2, 2010: US07670480 (3 worldwide citation)

A supply flow path for supplying a solvent is described. The supply flow path includes metering devices each with a piston, the metering devices being adapted for metering the solvent through separate source paths feeding the supply flow path. The supply flow path further includes a control unit ada ...


8
Konstantin Choikhet, Klaus Witt, Martin Baeuerle: Flow distribution mixer. Agilent Technologies, August 20, 2013: US08511889 (2 worldwide citation)

A mixer for mixing a fluid having a property varying along a flow direction of the fluid includes an inlet configured for receiving an inlet flow, an outlet configured for providing an outlet flow, and a plurality of flow channels coupled between the inlet and the outlet. The mixer also includes a f ...


9
Klaus Witt, Herbert Anderer, Alwin Ritzmann, Dominik Ruf: Configuring a physical condition at a source to obtain a desired physical condition at destination. Agilent Technologies, August 20, 2013: US08515587 (2 worldwide citation)

An apparatus for determining an operation mode of a device, wherein the device is capable of adjusting a physical condition at a source position to correspondingly influence a physical condition at a destination position, the apparatus comprising a determining unit adapted for determining the operat ...


10
Carl W Sims, Peter W Carr, Marcelo Roberto Filgueira, Klaus Witt: Valve and splitting system for multi-dimensional liquid analysis. Regents of the University of Minnesota, Shumaker & Sieffert P A, January 19, 2016: US09239319 (1 worldwide citation)

A multi-dimensional liquid analysis system includes a flow splitter for separating mobile phase outflow from a first dimension liquid analysis system into first and second liquid split outlet flows. Volumetric flow rate control of the split outlet flows is provided by a flow control pump which withd ...