Patents Assigned to Sartorius
  • Patent number: 4261430
    Abstract: A flat weighbridge has a load platform supported by either two one-armed or two two-armed levers arranged at least partly beneath the load platform, wherein one lever is bifurcated to define two spread apart sides and each of the sides bears a supporting device for the load platform, while the other lever bears only one supporting device for the load platform.
    Type: Grant
    Filed: December 4, 1979
    Date of Patent: April 14, 1981
    Assignee: Sartorius GmbH
    Inventors: Erich Knothe, Christoph Berg, Franz J. Melcher, Dieter Blawert
  • Patent number: 4253963
    Abstract: An asymmetrical ultrafiltration membrane based on cellulose triacetate, optionally substituted by up to 30% cellulose diacetate, is made wettable without tendency to embrittlement or shrinkage by adding hydrophobic synthetic silicic acid to the casting solution.
    Type: Grant
    Filed: April 10, 1979
    Date of Patent: March 3, 1981
    Assignee: Sartorius GmbH
    Inventors: Walter Franken, Dieter Nussbaumer, Horst Perl, Ludwig Weickhardt
  • Patent number: 4237988
    Abstract: An overload protection device for a top pan precision scale having a weighing pan support and a support plate carried by a load support mounted for limited movement and connected to an indicator, includes a spring engaged between the weighing pan support and the support plate whereby the weighing pan support is resiliently coupled to the load support, and a plurality of overlapping elements carried by the weighing pan support and extending beyond the outer peripheral edge of the support plate in close proximity thereto so that the weighing pan support and support plate are held in assembled relationship against the bias of the spring by the overlapping elements at the outer peripheral edge of the support plate, whereby upon eccentric loading of the scale, the pivot point of the weighing pan support is extended to the side of the weighing pan support opposite the load, and the lever translation thus effected results in a lower load on the load support than the highest available load.
    Type: Grant
    Filed: June 18, 1979
    Date of Patent: December 9, 1980
    Assignee: Sartorius GmbH
    Inventors: Dieter Blawert, Karl-Heinz Rademacher, Erich Knothe, Franz J. Melcher
  • Patent number: 4236590
    Abstract: A balance having an electromagnetically compensated loading system and an electromagnetically compensated reference system includes respective signal pathways provided for feeding signals which arise in or are derived from the two systems. These signals are to be compared for measurement. The signals from the two pathways are processed coincidentally with one another for digitization, beginning simultaneously and ending simultaneously.
    Type: Grant
    Filed: January 23, 1979
    Date of Patent: December 2, 1980
    Assignee: Sartorius GmbH
    Inventors: Erich Knothe, Franz-Josef Melcher
  • Patent number: 4235296
    Abstract: An automatic circuit is provided for a switching motor of electromechanical, self-stabilizing balance having electromechanical compensation. An analog transducer produces an analog measured value which triggers operation of a switching motor whenever an upper or lower limiting value is exceeded, the analog measured value being applicable to a display device. A computer, which actuates a control circuit for the switching motor and the display is connected to the analog transducer via an analog-digital converter, the converter being operatively arranged to derive fine information which is fed to the computer and high-speed coarse or preliminary information which is likewise supplied to the computer ahead of the fine information, which triggers said switching motor in event one or more limiting values is exceeded.
    Type: Grant
    Filed: January 29, 1979
    Date of Patent: November 25, 1980
    Assignee: Sartorius GmbH
    Inventors: Erich Knothe, Franz-Josef Melcher, Franz Rossmann
  • Patent number: 4234528
    Abstract: An asymmetrical ultrafiltration membrane based on cellulose hydrate which may be dried without destructive shrinkage and which has been saponified without reduction in flow-through or separation performance is prepared by adding hydrophobic synthetic silicic acid to a casting solution based on cellulose triacetate optionally partially substituted by cellulose diacetate, and then casting the cellulose acetate membrane and saponifying to the cellulose hydrate form.
    Type: Grant
    Filed: April 10, 1979
    Date of Patent: November 18, 1980
    Assignee: Sartorius GmbH
    Inventors: Dietmar Nussbaumer, Horst Perl
  • Patent number: 4219422
    Abstract: Apparatus for mass transfer between fluids, comprises two permeable membranes with a porous membrane support sandwiched therebetween, all pleated together with an accordian pleat to form a pleat package, and sealed in a casing to define three flow channels from one end of the casing to the other, to form a filter having a large filter area in a minimum amount of space for use as a dialyzer or as an ultrafilter in the treatment of blood. By selection of different membrane materials, the apparatus may also be used for oxygenation of blood, and three different fluids, including both gases and liquids, may be treated.
    Type: Grant
    Filed: January 25, 1979
    Date of Patent: August 26, 1980
    Assignee: Sartorius GmbH
    Inventors: Erich Knothe, Gerhard Lorenz
  • Patent number: 4204957
    Abstract: An artificial kidney comprising a filter which is disposed between an artery connection and a vein connection, a collecting means for the filtrate to be discharged from the filter, a means for providing a metered supply of substituate to the purified blood, and a measuring means including two weighing devices; a first of the weighing devices measures the weight of filtrate to be discharged, and a second of the weighing device measures the weight of the substituate; the measuring means controls the providing means whereby the metered supply of substituate is in a fixed weight proportionality to the filtrate weight.
    Type: Grant
    Filed: November 4, 1976
    Date of Patent: May 27, 1980
    Assignee: Sartorius Membranfilter GmbH
    Inventor: Ludwig Weickhardt
  • Patent number: 4156361
    Abstract: A calibratable electromagnetically compensating precision balance having a weighing and taring device, in the form of a pan support, is provided with a parallel guide. The output from the balance is fed to an analog-digital converter which has its output coupled, via a minicomputer (calculator), to a display. A reference weight is provided for the balance. The reference weight is externally switchable for its weight determination, i.e., from outside the housing of the balance. A lifting mechanism is provided to lift the pan from the support. A method for compensating the parameters of the above-described calibratable electromechanical balance which can influence sensitivity and accuracy, involves determining and recording the actual value (M) of reference weight, under the prevailing operating conditions using the balance. Forming a quotient from the actual measured value (M) and the set (given) value (m) of the reference weight, the quotient being expressed in the form of a factor (F).
    Type: Grant
    Filed: January 12, 1977
    Date of Patent: May 29, 1979
    Assignee: Sartorius-Werke GmbH
    Inventors: Franz J. Melcher, Heribert Rosenkranz
  • Patent number: 4153124
    Abstract: An electromagnetically compensating beam balance has a balance housing, a am and a fixed counterweight. Weight changing means, which change the weighing range (scale) by substitution, are provided on the load receiving side. A parallel guidance system is provided. Rods which accept only horizontal forces are coupled between a load carrier and the housing. Vertical flexure elements, which accept vertical forces, are coupled between the beam and the load carrier.
    Type: Grant
    Filed: May 10, 1977
    Date of Patent: May 8, 1979
    Assignee: Sartorius-Werke GmbH (und vorm. Gottinger Prazisionswaagenfabrik GmbH)
    Inventors: Erich Knothe, Christoph Berg, Franz J. Melcher
  • Patent number: 4153126
    Abstract: A parallel construction, particularly for a top-loading balance with elecmagnetic force compensation, has two essentially identical, preferably trapezoidal, movable guides in parallel horizontal planes. The guides are mounted permanently at one end and connected together by a movable rigid connecting element at the other end. The two guides are displaced relative to one another in their planes at right angles to their axis of rotation.
    Type: Grant
    Filed: March 13, 1978
    Date of Patent: May 8, 1979
    Assignee: Sartorius-Werke GmbH (und vorm. Gottinger Prazisionswaagenfabrick GmbH)
    Inventors: Erich Knothe, Christoph Berg, Eberhard Stadler, Hans-Heinrich Kohne
  • Patent number: 4150730
    Abstract: An electromagnetically compensating force-measuring or weighing device includes a working coil disposed in the air gap of a fixed magnetic circuit which includes a permanent magnet. The working coil is subject to the influence of the load to be measured. An indicator responsive to the position of the working coil, has its output fed to a control amplifier, the working coil being fed the output signal from the control amplifier whereby it is brought to the zero position. An additional coil is connected electrically in series with the working coil, the magnetic field produced by the additional coil being determined by a measurement sensor. The output signal of the measurement sensor is a measure of the load to be measured.
    Type: Grant
    Filed: December 13, 1977
    Date of Patent: April 24, 1979
    Assignee: Sartorius Werke GmbH
    Inventors: Erich Knothe, Christoph Berg
  • Patent number: 4147622
    Abstract: An asymmetrical permselective cellulose triacetate membrane has outstanding properties for desalination of seawater by reverse osmosis. It is made by casting a solvent solution of the cellulose triacetate in a solvent mixture of at least 40% acetone, a solvent for the triacetate and a swelling agent for the triacetate. The swelling agent, preferably formamide, must be added as the last component of the solution. After exposing the cast solution to evaporation for 2-90 seconds, it is precipitated in cold water, and then optionally tempered at 50.degree.-100.degree. C. in water which may contain a modifying agent, and dried.
    Type: Grant
    Filed: March 18, 1977
    Date of Patent: April 3, 1979
    Assignee: Sartorius Membran-Filter GmbH
    Inventor: Dietmar G. Nussbaumer
  • Patent number: 4103750
    Abstract: A method of producing signals for a damping control of an electric measurvalue indicator, especially an electromagnetic precision balance, having an active filter or impedance transformer located in a branch which filters out the a.c. voltage is disclosed. Transient signals in the form of a.c. voltages with different frequencies are applied to the output of the active filter or transformer in the noise range. Sequentially tapped values of the a.c. voltages are compared in the noise range with previous values. A circuit for producing signals for a damping control of an electric measured-value indicator includes a comparator connected with the low ohmage output of a filter or impedance transformer. The comparator is provided with a switchable voltage storage device to which a differentiating element and an amplifier are connected. When a.c.
    Type: Grant
    Filed: January 12, 1977
    Date of Patent: August 1, 1978
    Assignee: Sartorius-Werke GmbH (und vorm. Gottinger Prazisionswaagenfabrik GmbH)
    Inventors: Franz Josef Melcher, Christian Oldendorf
  • Patent number: 4091886
    Abstract: An electromagnetic, compensating force-measuring or weighing device having at least one working coil movable in an air gap of a magnet system. At least two members for temperature compensation are positioned at different, spaced apart points. The compensating effect of these members on the active part of the system jointly produce a temperature compensating value which is optionally approximately equal to the exact value of the actual temperature curve. The members may be in the form of a plurality of minute particles of nonretentive material having a high negative coefficient of saturation magnetization distributed in the active part. The members may be formed of the afore-mentioned material and be positioned on the active part or be PTC or NTC resistors so positioned.
    Type: Grant
    Filed: January 26, 1977
    Date of Patent: May 30, 1978
    Assignee: Sartorius-Werke GmbH
    Inventors: Erich Knothe, Christoph Berg, Eberhard Stadler
  • Patent number: 4085811
    Abstract: A beamless dynamometer or weighing device comprising a coil movable in the orking gap of a fixed magnet, the coil and magnet forming part of an electromagnetic compensation circuit for the dynamometer or device, and an arrangement for guiding movement of the coil within the working gap comprising an air bearing formed of a fixed guiding cylinder and an air-mounted slidable sleeve connected to the coil; preferably two coils are provided, each connected to a separate slidable sleeve, one sleeve being disposed inside the cylinder and the other sleeve outside the cylinder with the cylinder being formed of an annular jacket suppliable with compressed air which, in use, vents into the gap between the sleeves and cylinder, one sleeve being arranged to be acted upon by the force or mass to be measured and the other sleeve carrying a reference mass.
    Type: Grant
    Filed: August 3, 1976
    Date of Patent: April 25, 1978
    Assignee: Sartorius-Werke GmbH und. vorm. Goettinger Praezisionswaagenfabrik GmbH
    Inventors: Knothe, Erich, Christoph Berg, Eberhard Stadler
  • Patent number: 4074781
    Abstract: Electromagnetically compensating weighing or dynamometer apparatus in which coil moves out of an equilibrium position relative to a magnet under the influence of a force, including a compensating circuit providing a compensation current proportional to the amplitude of the deflection, an a taring arrangement comprising a store and a digital/analog converter connected to the coil in parallel to the compensation circuit.
    Type: Grant
    Filed: June 17, 1976
    Date of Patent: February 21, 1978
    Assignee: Sartorius-Werke GmbH (und. vorm. Gottinger Praezisionswagenfabrik GmbH)
    Inventor: Franz Josef Melcher
  • Patent number: 4062416
    Abstract: A beamless dynamometer or weighing machine has a work coil positioned in a working air gap of a magnet arrangement. A pair of elastic links of trapezoid-shaped construction are attached to a bracing part. The median axis of the work coil is arranged within a trapezoid bounded by arms and sides of the links. The magnet arrangement is positioned in space bounded by the links.
    Type: Grant
    Filed: April 15, 1976
    Date of Patent: December 13, 1977
    Assignee: Sartorius-Werke GmbH
    Inventors: Christoph Berg, Eberhard Stadler
  • Patent number: 4060771
    Abstract: An electrical circuit for suppressing the effect of interfering alternating oltages of various frequencies superimposed upon a direct current signal in an electric measurand transmitter, such as in an electromechanical precision or fine balance, which comprises a signal line for carrying said direct current signal and interfering alternating voltages, means for low energy capacitively coupling-out of interfering alternating voltages of frequencies lower than a predetermined limit frequency from the signal line, means for energy amplifying and for inverting 180.degree. in phase said coupled-out voltages, and means for capacitively coupling-back into the signal line the amplified and inverted coupled-out voltages.
    Type: Grant
    Filed: August 10, 1976
    Date of Patent: November 29, 1977
    Assignee: Sartorius-Werke GmbH (und vorm. Gottinger Prazisions-Waagenfabrik GmbH)
    Inventors: Franz Josef Melcher, Christian Oldendorf
  • Patent number: 4058007
    Abstract: A vibrating wire measuring instrument, such as a vibrating wire galvanometer, dynamometer, or strain gauge, wherein the wire which is to execute transverse vibrations is mounted between two fixing members, and node masses are rigidly attached to the wire so that the latter is subdivided into (a) two connection portions (between the node masses and the fixing members) and (b) an intermediate portion (between the node masses); the wire is of constant cross section and integrally formed; the node mass may be soldered or welded to the wire or clamped, e.g. in a detachable manner.
    Type: Grant
    Filed: March 15, 1976
    Date of Patent: November 15, 1977
    Assignee: Sartorius-Werke GmbH
    Inventor: Rainer Exner