Patents Assigned to POSTNOVA ANALYTICS GMBH
  • Patent number: 10132782
    Abstract: The present invention relates to an apparatus for field-flow fractionation and to a method for separating samples by means of field-flow fractionation using this apparatus. The apparatuses of the invention comprise a separation channel which, in addition to a first outlet for sample-containing solvent, comprises a second outlet for sample-free solvent, wherein the second outlet is arranged in a region of the separation channel from which sample-free solvent may be removed during elution and a flow volume control device is arranged downstream of the second outlet. They are characterized in that the flow volume control device is a mass flow controller.
    Type: Grant
    Filed: February 12, 2016
    Date of Patent: November 20, 2018
    Assignee: Postnova Analytics GmbH
    Inventors: Roland Welz, Thorsten Klein
  • Patent number: 9897577
    Abstract: The present invention relates to an apparatus for field-flow fractionation and to a method for separating samples by means of field-flow fractionation using this apparatus. The apparatuses of the invention comprise one or more reservoirs, a pump, a first flow volume splitting device, two valves for flow control, an injector, a separation channel having a first connector at a first end and a second connector at a second end or an AF4 separation channel having a first connector at a first end, a second connector at a second end and a third connector between the first and the second ends, optionally a second flow volume splitting device, a back-pressure element, one or more detector(s), a flow volume control device and one or more waste container(s).
    Type: Grant
    Filed: July 10, 2015
    Date of Patent: February 20, 2018
    Assignee: Postnova Analytics GmbH
    Inventor: Thorsten Klein
  • Patent number: 9329082
    Abstract: The invention provides a method for measuring light scattered on a sample in a medium, in particular a fluid medium, that comprises the following steps: providing a rotatably arranged measuring cell with a substantially circular cross-section in a plane perpendicular to the axis of rotation for receiving the medium and the sample, rotating the measuring cell, preferably at least once by substantially 360°, about the axis of rotation, in particular by means of a drive, emitting a laser beam by means of a laser onto the sample located within the measuring cell in the plane perpendicular to the axis of rotation at different angles of rotation of the measuring cell, the measuring cell maintaining its position in the direction of the axis of rotation, detecting scattered light signals by means of at least two detectors arranged in a circle and concentrically to the center of rotation of the measuring cell and fixed within set, different angular ranges at different angles of rotation of the measuring cell, and dete
    Type: Grant
    Filed: June 3, 2014
    Date of Patent: May 3, 2016
    Assignee: Postnova Analytics GmbH
    Inventor: Roland Welz
  • Patent number: 8758210
    Abstract: An apparatus for performing a centrifugal field-flow fractionation is disclosed. In an embodiment of the invention, radial rotary shaft seals are used for sealing the rotating parts of the shaft for carrying out the centrifugal field-flow fractionation and the stationary parts. Furthermore, a separate line is introduced for reducing the pressure differential across these seals. In such way, the driving force driving sample fluid across the seals is reduced, thereby reducing leakage.
    Type: Grant
    Filed: May 21, 2012
    Date of Patent: June 24, 2014
    Assignee: Postnova Analytics GmbH
    Inventor: Roland Welz
  • Patent number: 8760652
    Abstract: An apparatus for measuring the light scattering properties of a sample in a liquid medium, wherein the liquid medium with the sample is illuminated by a laser beam in a measuring cell transversely to the direction of filling the liquid medium in the measuring cell or transversely to the flow direction of the liquid medium within the measuring cell, comprising a laser, a cylindrical measuring cell, a first inner aperture system, a second outer aperture system and at least two detectors, wherein the detectors are arranged outside of the second outer aperture system so that they collect the light scattered on the sample within set, different angle ranges, wherein the first inner aperture system and the second outer aperture system are formed and arranged circularly and concentrically around the axis of the measuring cell. Use of the apparatus and a method that makes use of the apparatus are also disclosed.
    Type: Grant
    Filed: October 18, 2012
    Date of Patent: June 24, 2014
    Assignee: Postnova Analytics GmbH
    Inventors: Dietheim Fröse, Roland Welz
  • Publication number: 20140066280
    Abstract: The current invention relates to an apparatus for performing a centrifugal field-flow fractionation. In particular, in the apparatus according to the invention, radial rotary shaft seals are used for sealing the rotating parts of the shaft for carrying out the centrifugal field-flow fractionation and the stationary parts. Furthermore, a separate line is introduced for reducing the pressure differential across these seals. In such way, the driving force driving sample fluid across the seals is reduced, thereby reducing leakage.
    Type: Application
    Filed: May 21, 2012
    Publication date: March 6, 2014
    Applicant: POSTNOVA ANALYTICS GMBH
    Inventor: Roland Welz
  • Patent number: 8576396
    Abstract: The invention relates to a device and to a method for measuring the scattered light about molecules present in a suspension, wherein the suspension is fed through a measurement cell. The measurement cell is produced as a segment of a curved surface, particularly an ellipsoid, a hyperbolic shape, a parabolic shape, or a circle, and comprises a curved and a flat surface. Light-sensitive detectors are disposed about the curved surface and capture the scattered light.
    Type: Grant
    Filed: November 19, 2009
    Date of Patent: November 5, 2013
    Assignee: Postnova Analytics GmbH
    Inventor: Diethelm Fröse
  • Publication number: 20130100433
    Abstract: An apparatus for measuring the light scattering properties of a sample in a liquid medium, wherein the liquid medium with the sample is illuminated by a laser beam in a measuring cell transversely to the direction of filling the liquid medium in the measuring cell or transversely to the flow direction of the liquid medium within the measuring cell, comprising a laser, a cylindrical measuring cell, a first inner aperture system, a second outer aperture system and at least two detectors, wherein the detectors are arranged outside of the second outer aperture system so that they collect the light scattered on the sample within set, different angle ranges, wherein the first inner aperture system and the second outer aperture system are formed and arranged circularly and concentrically around the axis of the measuring cell. Use of the apparatus and a method that makes use of the apparatus are also disclosed.
    Type: Application
    Filed: October 18, 2012
    Publication date: April 25, 2013
    Applicant: Postnova Analytics GmbH
    Inventor: Postnova Analytics GmbH
  • Publication number: 20110242535
    Abstract: The invention relates to a device and to a method for measuring the scattered light about molecules present in a suspension, wherein the suspension is fed through a measurement cell. The measurement cell is produced as a segment of a curved surface, particularly an ellipsoid, a hyperbolic shape, a parabolic shape, or a circle, and comprises a curved and a flat surface. Light-sensitive detectors are disposed about the curved surface and capture the scattered light.
    Type: Application
    Filed: November 19, 2009
    Publication date: October 6, 2011
    Applicant: POSTNOVA ANALYTICS GMBH
    Inventor: Diethelm Fröse