EP0261183A1 - Process and device for sorting of paramagnetic particles in the fine and very fine grain range in a strongly magnetic field - Google Patents
Process and device for sorting of paramagnetic particles in the fine and very fine grain range in a strongly magnetic fieldInfo
- Publication number
- EP0261183A1 EP0261183A1 EP87902052A EP87902052A EP0261183A1 EP 0261183 A1 EP0261183 A1 EP 0261183A1 EP 87902052 A EP87902052 A EP 87902052A EP 87902052 A EP87902052 A EP 87902052A EP 0261183 A1 EP0261183 A1 EP 0261183A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- induction element
- channel
- particles
- separating
- field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/035—Open gradient magnetic separators, i.e. separators in which the gap is unobstructed, characterised by the configuration of the gap
Definitions
- strong field magnetic separators are used, in which ferromagnetic induction elements are provided in a magnet arrangement in a homogeneous magnetic field generated between the magnets, which cause field distortion and thus magnetic attraction and repulsion forces .
- the material (separating material) to be separated which is suspended in a liquid or gaseous carrier medium, usually water, possibly also air, is made of paramagnetic particles and non-magnetizable particles and is passed through the magnetic field distorted along the induction elements.
- the paramagnetic particles are deflected by the magnetic attraction towards the induction bodies and attach to them, while the other, non-magnetizable particles follow the flow of the carrier medium and pass the magnetic field.
- the particles attached to the induction elements are rinsed off and rinsed out at a later point in time, when the magnetic field is no longer effective, in order to obtain the magnetic concentrate.
- Such magnetic separators are therefore also referred to as retention separators.
- the induction elements can be profiled plates, spheres, cylindrical rods or wires.
- the characteristic length of their topography for example the diameter of the wires or the height of the profiles, determines the degree of inhomogeneity of the magnetic field, which increases monotonically with decreasing dimensions.
- the magnetic force increases with the degree of inhomogeneity is proportional to the susceptibility of the particles and the particle volume and increases with decreasing distance from the induction element.
- the basic structure of the restraint cutter requires a discontinuous mode of operation. However, continuous operation is desirable in an industrial process. In order to achieve this, special measures must be taken.
- two or more magnetic separators are used, the separation cycles of which follow one another.
- the material to be separated is fed to the magnetic separator in the separation cycle.
- the magnet is then switched off and the concentrate is rinsed out while another magnetic separator is sorting when the magnetic field is switched on.
- Another possibility is to remove the package of the induction elements from the magnetic field and then to rinse out the magnetic concentrate.
- a carousel arrangement is particularly suitable for this purpose, since unloaded induction elements are always introduced into the magnetic field and loaded ones are removed. The most widely used design of strong magnetic field magnetic separators therefore realizes the carousel arrangement.
- Proposals are also known for building strong-field magnetic separators based on the principle of continuously operating cross-flow separators.
- the paramagnetic particles are attracted to the induction elements by the force of attraction, that is to say transversely to the transport direction, distracted. However, they should not accumulate there but be transported by the flowing medium along the induction elements and be separated at the exit of the or each separation channel by cutting from the rest of the current loaded with the non-magnetizable particles.
- Such a cross-current strong-field magnetic separator has the theoretical advantage over the cyclically operating magnetic separators or carousel separators that the magnetic field does not have to be switched on and off and the task and product flows do not have to be switched over, the arrangement of the induction elements remains stationary and the structurally complex carousel is eliminated, but the disadvantage is that when this proposal is implemented in a separator which can be used on an industrial scale, the difficulty arises that the transport of the particles, in particular the paramagnetic particles, along the induction elements is unsatisfactory or at all not happened.
- Cross-current strong field magnetic separators of this type do not prove themselves in the fine grain range.
- the object of the present invention is to create a method with which material which contains paramagnetic particles in the fine grain range below approximately 1 mm can be continuously sorted in cross-flow in a strong magnetic field.
- the object of the invention is also to provide a method of the type mentioned, which allows a more effective separation and better selectivity.
- Another task is to create a process which enables sufficient throughputs for large-scale use.
- Another object of the present invention is to provide an apparatus for performing the continuous sorting method mentioned.
- the separating material flow flows parallel to at least one induction element and is depleted in at least one of paramagnetic particles and one of paramagnetic particles at the end of a separating section divided enriched product stream.
- the separating material flow is conducted parallel to each induction element in a magnetic field in which the magnetic repulsive force of each induction element is oriented to gravity, with a good stationary system, or to centrifugal force, with a rotating system, so that the resulting force ab ⁇ paramagnetic particles to be separated away from the induction element and the other particles moved towards the induction element, the current being conducted above each induction element in the gravitational field and on the inside of each induction element facing the axis of rotation in the centrifugal field.
- the specified method of continuous sorting is carried out with a device in which an induction element in the form of a wire with a circular elliptical or romboid cross section is aligned at right angles to the field lines of the magnet arrangement outside each separation channel.
- Each separation channel which is approximately as long as the induction element, is located above the induction element and has a width of approximately up to the single and a height of approximately one to two times the diameter of the induction element.
- the new magnetic separation method and the new strong field magnetic separator make it possible to achieve perfect technical separations in the particle size range between a few micrometers and a few millimeters with a magnetic susceptibility of the paramagnetic particles between 10 -5 and 10-2.
- both the magnetic repulsion force is used for the separation and the mass force (gravity or centrifugal force). This repulsive force is directed antiparallel to gravity or centrifugal force.
- each induction element areas with field compaction, which bring about attractive forces, and field thinning, which cause repulsive forces, occur side by side.
- the field only has a rod-shaped or wire-shaped cylindrical induction element circular, elliptical or rhomboid cross-section a four-beam symmetry, as shown in Fig. La.
- the inherently homogeneous magnetic field of field strength H is aligned in such a way that the field lines run horizontally.
- the rod-shaped or wire-shaped cylindrical induction elements are arranged horizontally but at right angles to the field lines. This arrangement results in repulsions in sectors I and III and in forces in sectors II and IV, which decrease with increasing distance from the axis.
- a separation channel 2 provided above an induction element 1, the particles are arranged according to their susceptibility at different heights, while particles with a susceptibility of zero sediment on the bottom of the separation channel due to gravity.
- paramagnetic particles 3 and non-magnetizable or non-magnetic particles 4 drift in opposite directions, as shown in FIG. 1b, so that for the first time both types of particles can be effortlessly separated from one another. If the separation channel 2 is sufficiently high, the paramagnetic particles do not touch the upper channel wall; their transport through the separation channel therefore remains unimpeded.
- the material to be separated is dispersed in a fluid medium and, as a material to be separated 5, as shown in FIG. 1c, is fed in at the inlet end 7 of the separation channel 2 and sorted on a subsequent separation section 11.
- a cutting edge 13 is provided which divides it into an upper outlet channel 14 and a lower outlet channel 15.
- the separation channel 2 can also be supplied with two streams separated from one another, see FIG. Fig. Id.
- a partition 8 is provided in it at the inlet end 7, which divides the inlet end into an upper inlet channel 9 and a lower inlet channel 10.
- the separating material stream 5 is fed into the lower inlet duct 10.
- the flow rate is to be set such that the dwell time in the separation section 11 of the separation channel is sufficient for the drift of all or at least most of the paramagnetic particles over the height of the cutting edge 13 provided on the outlet side.
- the separation channel 2 and the induction element 1 are preferably from the inlet to the outlet at an angle of 0 ° to 50 °, preferably from 15 ° to 40 °, against the Hori ⁇ zonal inclined.
- Particles between 10 and 100 ⁇ m are sorted in such a way that incorrect application of hematite in the lower product stream, i.e. in the non-magnetic, or of quartz in the upper product stream, i.e. in the magnetic concentrate, results in less than 2%.
- the induction element was a pure iron wire of 3 mm in diameter and 100 mm in length, the flux density was set to 1.5 Tesla and the flow rate to 8 cm / s.
- the induction elements can be arranged in such a way that either a rectangular pattern, as shown in FIG. 2a, or a rhomboid pattern corresponding to FIG. 2b is produced in cross section.
- the superimposition of the magnetic fields results in surfaces 20 in which the magnetic force effect disappears.
- the equilibrium height of the paramagnetic particles lies below these areas. If the upper wall of the separation channel is not below surface 20, then the parametric particles do not rise to the upper wall, so that their transport through the separation channel is not hindered by friction or adhesive forces.
- the cutting edge 13 is to be positioned below the equilibrium height.
- the induction elements arranged on the side of the separating channel have the effect that, above a certain height, the upward magnetic force rises again from a minimum value to a maximum at the level of the connecting line between the centers of the induction elements and then drops to zero.
- This force curve between the heights of the mini-space and the maximum creates a particle-free layer, as a result of which the current enriched with paramagnetic particles can be separated more easily from that current which is depleted of paramagnetic particles.
- the magnetic field can be generated either by permanent magnets, electromagnets or by superconducting coils.
- the opposite drift directions of paramagnetic and non-magnetic particles require a mass force that counteracts the magnetic repulsive force. With straight, fixed separation channels, this is gravity.
- the centrifugal force can also be used for this if the induction elements and the separation channels are provided in a rotating system concentrically or spirally to its axis of rotation or if fixed induction elements and separation channels have a curved shape, so that centrifugal forces arise when flowing through.
- 5a and 5b show a magnetic separator with an arrangement of spiral induction elements and separation channels in a rotor rotating in longitudinal and cross-section between the poles of a permanent or electromagnet, and
- FIG. 6 shows a magnetic separator with an arrangement of spiral induction elements and separation channels in a rotor rotating in a superconducting coil.
- the magnet which can be a permanent magnet or, preferably, an electromagnet, is oriented so that the field lines run horizontally.
- a body 23 with a separation system made of wire-shaped induction elements 1 and overlying separation channels 2.
- the induction elements are at right angles to the field lines, but are opposite the horizontal line. len inclined at an angle of 15 to 40 °.
- each separating channel 2 the separating material stream 5, generally separating material, is suspended in water at the inlet end 7 below a dividing wall 8 through the lower inlet channel 10, and a separating material-free fluid stream 6 is fed in above the dividing wall 8 through the upper inlet channel 9, generally pure water.
- the cutting edge 13 At the outlet end 12 of each separation channel 2, but still in the magnetic field, there is the cutting edge 13, which separates the flow into an upper product flow 16 with the magnet concentrate and a lower product flow 17 with the magnetic table, which is drawn off through the outlet channels 14 and 15, respectively will.
- a first channel system, not shown, at the inlet end 7 of the separation system distributes the material flow 5 and the fluid stream 6 to the separation channels 2, a second channel system, also not shown, at the outlet end 12, on the one hand, holds the upper product streams 16 and, on the other hand, the lower product streams 17 together.
- a superconducting coil 25 has a rectangular, warm opening 26.
- the coil is arranged in such a way that the field lines axially directed in the coil interior run horizontally and the longer edge of the rectangular, warm opening 26 is inclined at an angle between 15 ° and 40 ° with respect to the horizontal.
- the separation system is located in the warm opening 26.
- the induction elements 1 and separation channels 2 are aligned at right angles to the field lines and parallel to the longer edge.
- each separating channel 2 is given a separating material flow 5 below through inlet channels 10 and a water flow is separated from one another at the top through inlet channels 9 and a dividing wall 8, and there are two product flows 16 and 17 at the outlet end 12 separated from each other by a cutting edge 13, withdrawn through outlet channels 14 and 15.
- the distribution of the entire separating material flow and the entire water flow to the separating channels 2 is also carried out by a channel system, as are the upper and lower product flows from the outlet channels 14 and 15 of each separating channel.
- 5 shows a repulsion strong-field magnetic separator for sorting in a centrifugal field with a permanent or electromagnetic arrangement.
- the magnet is preferably mounted in such a way that the field lines run vertically.
- a plurality of induction elements 1 and separation channels 2 leading from inside to outside in a spiral shape are formed in rotor 30.
- the separation channels 2 are located on the inside of the induction elements 1 facing the axis of rotation.
- the material flow 5 is fed via a single inlet channel 32 in the upper part of the shaft 31 and is distributed to the separation channels 2 of the rotor 30 by a channel system (not shown).
- the upper product streams 16 and the lower product streams 17 of the separation channels 2 are brought together by a channel system, also not shown, and discharged via two outlet channels 14 and 15 in the lower part of the shaft 31 of the rotor 30.
- the repulsion strong field magnetic separator for sorting in the centrifugal field according to FIG. 6 has a superconducting coil.
- a rotor 30 rotates in its warm, circular opening 26.
- the axis of rotation of the shaft 31 coincides with the coil axis.
- the induction elements 1 and the separation channels 2 of the rotor 30 run concentrically to the axis of rotation in planes perpendicular to the axis of rotation.
- the material flow 5 is fed via an inlet channel 32 in the upper part of the shaft 31 and distributed to the separation channels 2 by a channel system, not shown.
- the respective upper product streams 16 and lower product streams 17 are brought together separately and discharged via the two outlet channels 14 and 15 in the lower part of the rotor shaft 31.
Abstract
Séparation, à l'aide d'un champ fortement magnétique, d'un produit à séparer qui est en suspension dans un milieu fluide et qui se compose de particules paramagnétiques et non magnétisables de plages granulométriques fines et très fines inférieures à environ 1mm. Dans un champ fortement magnétique, dans lequel les forces d'attraction et de répulsion magnétiques sont produites par des éléments d'induction (1) disposés longitudinalement, le flux de produits à séparer est acheminé dans un conduit de séparation (2) parallèle à au moins un élément d'induction, à l'extrémité de sortie (12) duquel conduit s'écoulent un flux de produit (17) appauvri en particules paramagnétiques et un flux de produit (16) enrichi en particules paramagnétiques, ladite extrémité étant séparée par une cloison (13). Dans le but de parvenir à un tri performant dans la plage granulométrique fine, la force de répulsion magnétique de chaque élément d'induction et la force gravitationnelle sont orientées l'une par rapport à l'autre de telle manière que la force résultante détourne de l'élément d'induction les particules paramagnétiques à séparer et que les autres particules sont dirigées vers ledit élément d'induction. Chaque élément d'induction (1) est agencé au-dessous du conduit de séparation correspondant et à angle droit par rapport aux lignes de champ. Le conduit de séparation est de préférence incliné par rapport à l'horizontale. La séparation magnétique peut également s'effectuer dans le champ centrifuge.Separation, using a strongly magnetic field, of a product to be separated which is in suspension in a fluid medium and which consists of paramagnetic and non-magnetizable particles with fine and very fine particle size ranges of less than about 1 mm. In a strongly magnetic field, in which the magnetic attraction and repulsion forces are produced by induction elements (1) arranged longitudinally, the flow of products to be separated is conveyed in a separation duct (2) parallel to the at least one induction element, at the outlet end (12) of which leads a flow of product (17) depleted in paramagnetic particles and a flow of product (16) enriched in paramagnetic particles, said end being separated by a partition (13). In order to achieve efficient sorting in the fine grain size range, the magnetic repulsion force of each induction element and the gravitational force are oriented with respect to each other in such a way that the resulting force diverts from each other. the induction element the paramagnetic particles to be separated and that the other particles are directed towards said induction element. Each induction element (1) is arranged below the corresponding separation duct and at right angles to the field lines. The separation duct is preferably inclined relative to the horizontal. Magnetic separation can also take place in the centrifugal field.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3610303 | 1986-03-26 | ||
DE3610303A DE3610303C1 (en) | 1986-03-26 | 1986-03-26 | Methods and devices for sorting paramagnetic particles in the fine and fine grain range in a strong magnetic field |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0261183A1 true EP0261183A1 (en) | 1988-03-30 |
Family
ID=6297369
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87902052A Withdrawn EP0261183A1 (en) | 1986-03-26 | 1987-03-25 | Process and device for sorting of paramagnetic particles in the fine and very fine grain range in a strongly magnetic field |
Country Status (7)
Country | Link |
---|---|
US (1) | US4941969A (en) |
EP (1) | EP0261183A1 (en) |
AU (1) | AU601729B2 (en) |
BR (1) | BR8706769A (en) |
DE (1) | DE3610303C1 (en) |
WO (1) | WO1987005829A1 (en) |
ZA (1) | ZA871916B (en) |
Families Citing this family (30)
Publication number | Priority date | Publication date | Assignee | Title |
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DE3827252A1 (en) * | 1988-08-11 | 1990-02-15 | Unkelbach Karl Heinz Dr | Process and apparatus for the continuous separation of mixtures containing biological microsystems and cells |
US5536475A (en) * | 1988-10-11 | 1996-07-16 | Baxter International Inc. | Apparatus for magnetic cell separation |
US5224604A (en) * | 1990-04-11 | 1993-07-06 | Hydro Processing & Mining Ltd. | Apparatus and method for separation of wet and dry particles |
US5191981A (en) * | 1991-12-02 | 1993-03-09 | Young Frederick W | Specific gravity metal separator |
US5275292A (en) * | 1992-05-18 | 1994-01-04 | Brugger Richard D | Eddy current separator |
US5628407A (en) * | 1994-12-05 | 1997-05-13 | Bolt Beranek And Newman, Inc. | Method and apparatus for separation of magnetically responsive spheres |
US5568869A (en) * | 1994-12-06 | 1996-10-29 | S.G. Frantz Company, Inc. | Methods and apparatus for making continuous magnetic separations |
US5655665A (en) * | 1994-12-09 | 1997-08-12 | Georgia Tech Research Corporation | Fully integrated micromachined magnetic particle manipulator and separator |
US5909813A (en) * | 1997-01-13 | 1999-06-08 | Lift Feeder Inc. | Force field separator |
US6098810A (en) * | 1998-06-26 | 2000-08-08 | Pueblo Process, Llc | Flotation process for separating silica from feldspar to form a feed material for making glass |
DE19853658A1 (en) * | 1998-11-20 | 2000-05-31 | Evotec Biosystems Ag | Manipulation of biotic or abiotic particles suspended in fluid microsystem, useful for e.g. separation and aggregate formation of biological particles |
EP1089823B1 (en) | 1998-06-26 | 2003-11-12 | Evotec OAI AG | Electrode arrangement for generating functional field barriers in microsystems |
EP1092144A1 (en) | 1998-06-29 | 2001-04-18 | Evotec BioSystems AG | Method and device for manipulating particles in microsystems |
US6365856B1 (en) | 1998-10-20 | 2002-04-02 | William Whitelaw | Particle separator and method of separating particles |
US6273265B1 (en) * | 1999-07-13 | 2001-08-14 | Bechtel Corporation | Magnetically enhanced gravity separator |
DE19934427C1 (en) | 1999-07-22 | 2000-12-14 | Karlsruhe Forschzent | Magnetic mineral particle separator has circular or elliptical passages improving separation process |
US20020164659A1 (en) * | 2000-11-30 | 2002-11-07 | Rao Galla Chandra | Analytical methods and compositions |
US6846429B2 (en) | 2001-01-16 | 2005-01-25 | E. I. Du Pont De Nemours And Company | Transparent paramagnetic polymer |
US20030119057A1 (en) * | 2001-12-20 | 2003-06-26 | Board Of Regents | Forming and modifying dielectrically-engineered microparticles |
NL1025050C1 (en) * | 2003-03-17 | 2004-09-21 | Univ Delft Tech | Process for recovering non-ferrous metal-containing particles from a particle stream. |
FR2860995B1 (en) * | 2003-10-15 | 2006-12-15 | Lenoir Raoul Ets | MAGNETIC SEPARATOR |
US20050274650A1 (en) * | 2004-06-09 | 2005-12-15 | Georgia Tech Research Corporation | Blood separation systems in micro device format and fabrication methods |
US8083069B2 (en) * | 2009-07-31 | 2011-12-27 | General Electric Company | High throughput magnetic isolation technique and device for biological materials |
US8292084B2 (en) * | 2009-10-28 | 2012-10-23 | Magnetation, Inc. | Magnetic separator |
AU2012213470A1 (en) * | 2011-02-01 | 2013-08-15 | Basf Corporation | Apparatus for continuous separation of magnetic constituents and cleaning magnetic fraction |
US8708152B2 (en) | 2011-04-20 | 2014-04-29 | Magnetation, Inc. | Iron ore separation device |
US10189029B2 (en) * | 2016-06-30 | 2019-01-29 | United Arab Emirates University | Magnetic particle separator |
DE102017008035A1 (en) | 2016-09-05 | 2018-03-08 | Technische Universität Ilmenau | Apparatus and method for separating magnetically attractable particles from fluids |
CL2016003331A1 (en) * | 2016-12-26 | 2017-05-05 | Univ Chile | Magneto-centrifugal flotation cell for mineral concentration that reduces water consumption |
DE102018113358B4 (en) | 2018-06-05 | 2022-12-29 | Technische Universität Ilmenau | Apparatus and method for the continuous, separate sampling of magnetically attractable and magnetically repulsive particles from a flowing fluid |
Family Cites Families (9)
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US1056318A (en) * | 1911-05-17 | 1913-03-18 | Stephan Brueck | Apparatus for magnetically separating materials. |
US3966590A (en) * | 1974-09-20 | 1976-06-29 | The United States Of America As Represented By The Secretary Of The Interior | Magnetic ore separator |
DE2461760C3 (en) * | 1974-12-28 | 1979-02-22 | Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe | Free-fall magnetic separator |
DE2528713A1 (en) * | 1975-06-27 | 1977-01-20 | Kloeckner Humboldt Deutz Ag | METHOD AND DEVICE FOR THE PROCESSING OF SUBSTANCES BY MAGNETIC SEPARATION |
US4102780A (en) * | 1976-03-09 | 1978-07-25 | S. G. Frantz Company, Inc. | Method and apparatus for magnetic separation of particles in a fluid carrier |
US4235710A (en) * | 1978-07-03 | 1980-11-25 | S. G. Frantz Company, Inc. | Methods and apparatus for separating particles using a magnetic barrier |
US4261815A (en) * | 1979-12-31 | 1981-04-14 | Massachusetts Institute Of Technology | Magnetic separator and method |
US4663029A (en) * | 1985-04-08 | 1987-05-05 | Massachusetts Institute Of Technology | Method and apparatus for continuous magnetic separation |
SU1338894A1 (en) * | 1985-04-19 | 1987-09-23 | Северо-Кавказский горно-металлургический институт | Magnetohydrostatic separator |
-
1986
- 1986-03-26 DE DE3610303A patent/DE3610303C1/en not_active Expired
-
1987
- 1987-03-16 ZA ZA871916A patent/ZA871916B/en unknown
- 1987-03-25 BR BR8706769A patent/BR8706769A/en unknown
- 1987-03-25 US US07/146,811 patent/US4941969A/en not_active Expired - Fee Related
- 1987-03-25 AU AU72008/87A patent/AU601729B2/en not_active Ceased
- 1987-03-25 WO PCT/DE1987/000128 patent/WO1987005829A1/en not_active Application Discontinuation
- 1987-03-25 EP EP87902052A patent/EP0261183A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO8705829A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU7200887A (en) | 1987-10-20 |
BR8706769A (en) | 1988-02-23 |
ZA871916B (en) | 1988-01-27 |
DE3610303C1 (en) | 1987-02-19 |
WO1987005829A1 (en) | 1987-10-08 |
AU601729B2 (en) | 1990-09-20 |
US4941969A (en) | 1990-07-17 |
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