GB2343392A - Ultrasonic sieving apparatus - Google Patents
Ultrasonic sieving apparatus Download PDFInfo
- Publication number
- GB2343392A GB2343392A GB9923513A GB9923513A GB2343392A GB 2343392 A GB2343392 A GB 2343392A GB 9923513 A GB9923513 A GB 9923513A GB 9923513 A GB9923513 A GB 9923513A GB 2343392 A GB2343392 A GB 2343392A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resonator
- coupler
- ultrasonic
- sieving apparatus
- dimensions
- 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.)
- Granted
Links
- 238000007873 sieving Methods 0.000 title claims abstract description 23
- 238000000926 separation method Methods 0.000 claims abstract description 13
- 230000005284 excitation Effects 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B3/00—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B2230/00—Specific aspects relating to the whole B07B subclass
- B07B2230/04—The screen or the screened materials being subjected to ultrasonic vibration
Abstract
An ultrasonic sieving apparatus (10) is described which comprises a de-coupler (18) for enabling a combination of a transducer (T) and a first resonator (16) to be supported with respect to a sieve which includes a separation medium (14) provided in a frame (12) such that vibrations generated by the transducer (T) are transmitted to the separation medium (14) via the first resonator (16). The first resonator (16) is of substantially circular cross-section and has first dimensions. The ultrasonic de-coupler (18) which is also of generally circular cross-section and of second dimensions, is connected to and is concentric with the first resonator (16). In use the de-coupler (18) is attached to a bracket (20) adapted to mount the de-coupler (18) onto the frame (12). The first dimensions of the first resonator (16) are such that the resonator (16) is connected to the transducer (T) at an anti-node and the second dimensions of the ultrasonic de-coupler (18) are such that it is connected to the first resonator (16) at a node.
Description
. 111 1 2343392
Title: Improved efficiency ultrasonic sieving apparatus. Description of Invention
The invention relates to an ultrasonic sieving apparatus, and in particular to such an apparatus incorporating an ultrasonic de-coupler adapted to provide mechanical support for a transducer and resonator intended to vibrate a sieve or other separation medium.
It is well known to vibrate sieves using ultrasound for many industrial applications, and some laboratory applications. This helps prevent the sieve blinding, and therefore increases the through put of material. Typically the sieve comprises a mesh and a mesh frame in which the mesh is held under tension. A transducer is provided adjacent to the mesh in order to vibrate the mesh, typically the transducer is coupled to a resonator to improve the transmission of the vibrations to the mesh. A second resonator, for example of extended configuration, may be connected to the first resonator to increase the transmission of thevibrations'to the mesh.
However, one of the main problems experienced in the prior art is providing the necessary mechanical support for the relatively heavy transducer in such a way that movement of the transducer is prevented whilst avoiding ultrasonic coupling between the transducer and the rnesh frame. Such coupling is undesirable as it increases the load on the transducer and decreases the energy efficiency of the apparatus. Indeed, the increased energy input to the system to offset the inefficiency has furthcr negative effects. For example it may cause overheating which may damage any adhesives used in the system, and it may lead to damage of the mesh. Both of these effects can reduce the serviceable lifespan of the sieve thas increasing costs of consurnables and increasing downtime of the apparatLIS,
2 Various prior art sieving apparatus have incorporated de-couplers which have attempted to overcome these problems, but none are very successful and they tend to be complex in form and thus expensive to manufacture. For example, as illustrated in Figure 1, it is known to use a cylindrical extension attached to the transducer, which has dimensions such that the resonator connected to it is connected at an anti-node in order to optimise excitation of the resonator. However, the bracket required to support the de-coupler on the mesh frame is also connected at an antinode thus requiring the bracket to be of complex design in an attempt not to transmit the vibrations to the mesh frame.
It is an object of the invention to provide an alternative form of ultrasonic sieving apparatus comprising a de-coupler which mitigates the above described problems.
According to the present invention there is provided an ultrasonic sieving apparatus comprising a de-coupler for enabling a combination of a transducer and a first resonator to be supported with respect to a sieve which includes a separation medium provided in a frame, such that vibrations generated by the transducer are transmitted to the separation medium via the first resonator, the first resonator being of substantially circular cross-section and having first dimensions, characterised in that the ultrasonic de-coupler is of substantially circular cross-section and of second dimensions connected to and concentrically with the first resonator and which in use is attached to a bracket adapted to mount the de-coupler onto the frame, the first dimensions of the first resonator being such that the first resonator is connected to the transducer at an anti-node and the second dimensions of the ultrasonic decoupler being such that it is connected to the first resonator at a node.
The invention provides the advantage that the transducer is more effectively de-coupled from the frame and therefore the transmission of ultrasonic energy to the frame is significantly reduced when compared with the prior art. This reduces energy consumption, reduces the wear and tear on the apparatus and minimises the influence of the frame on the frequency of operation, which in turn reduces tuning problems for different frame sizes.
With the first resonator adapted to vibrate in a diaphragm mode when in use excited by the transducer the second dimensions of the ultrasonic decoupler are preferably such that in use the de-coupler is attached to the bracket at a diaphragm mode node. Preferably it is also attached to the bracket at a longitudinal mode node.
The de-coupler and/or the first member may be substantially cylindrical. In the alternative the de-coupler and/or the first resonator may have variable generally circular cross-section along their length.
The de-coupler may include portions spaced apart around its generally circular cross-section with gaps therebetween.
The separation medium may comprise a mesh.
Preferably the apparatus further comprises a second resonator adapted to transmit the ultrasonic vibrations from the first resonator to the separation medium.
An example of an ultrasonic de-coupler according to the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:
FIGURE I illustrates a prior art arrangement;
FIGURE 2 is a schematic plan view of a sieving apparatus according to the invention; FIGURE 3 gives a a plan view of, and b a section through the de-coupler incorporated in the apparatus of Figure 2, wbilst c and d show two alternative forms of de-coupler; FIGURE 4 gives a a plan view, b a section through A-A, and c a lateral view of the bracket incorporated in the apparatus of Figure 2; FIGURE 5 gives a a plan view, b a section through A-A of an alternative form a sieving apparatus according to the invention; and 4 FIGURES 6 to 8 are schematic plan views of alternative embodiments of sieving apparatus according to the invention.
Referring to Figures 2 to 4, a sieving apparatus 10 comprises a mesh frame 12 and a mesh 14 held in the mesh frame 12 under tension. An ultrasonic transducer T, for excitation of the mesh 14, is mounted on a first resonator 16, which in turn is mounted on the mesh frame 12 by means of an ultrasonic decoupler 18 and a bracket 20. A second resonator 22, in this case of extended Ushaped configuration is also connected to the first resonator 16, and is in sonic contact with the mesh 14 in order to excite the mesh 14.
The first resonator 16 and ultrasonic de-coupler 18 together comprise a cylindrical extension to the transducer. The first resonator 16 is of first dimensions, in this example designed to operate at 35kHz, with an internal diameter of 8.2mm, an external diameter of 56.75mm, and a thickness of 20.Omm. The ultrasonic de-coupler 18 is of second dimensions, in this example with an internal diameter of 30.0mm, an external diameter of 38.Omm, and a thickness of 6.Omm.
The first resonator 16 and de-coupler 18 may be manufactured integral with each other or manufactured separately and subsequently joined together by any appropriate means, such as threads, welding or brazing. In this case they are made integrally from stainless steel. In an alternative the de-coupler could be manufactured integrally with the bracket and subsequently joined to the first resonator.
The dimensions of the first resonator 16 are selected to ensure that it vibrates in a diaphragm mode when excited by the transducer and that the second resonator 22 is connected to it at an anti-node. This ensures maximum excitation of the second resonator 22, and thus maximum excitation of the mesh 14. The dimensions of the ultrasonic de-coupler 19 are selected to ensure that it is connected to the first resonator 16 at a diaphragm mode node, thus minimising the excitation of the de-coupler 18. Preferably the thickness of the de-coupler 18 is also carefully selected to enable the bracket 20 to be connected to it at a longitudinal mode node, thus ensuring minimal excitation of the bracket 20 and hence minimal transmission of ultrasonic energy to the mesh frame 12.
Although the first resonator 16 and de-coupler 18 described here are cylindrical they could take other forms, with circular cross-section, within the scope of the invention. For example they could taper with linear or non- linear variation of cross-section. The cross-section concerned is that taken perpendicular to a longitudinal axis through the components and about which they are rotationally symmetrical. One alternative form of de-coupler of this kind is shown in Figure 3)c referenced 18'. Further, rather than being a complete annulus the de-coupler could comprise portions of an annulus evenly spaced about the circle, with gaps therebetween, as shown in Figure 3d referenced 18".
In the above described example the transducer operates at 35kHz and the apparatus is dimensioned appropriately, although it should be appreciated that the invention applies to other frequencies in the range 10-100kHz.
The second resonator 22 may be absent or may take any appropriate form, for example a diaphragm resonator, an extended circular planar resonator or indeed a plurality of such resonators.
The bracket 20 may also be of any appropriate form, and in particular may be very simple as it does not need to provide de-coupling as in the prior art. The bracket 20 illustrated in Figure 4 is pressed, or otherwise manufactured, from sheet steel, with portions along the edges bent upwards to provide additional stiffening without extra weight.
Referring now to Figure 5 an alternative embodiment of the invention is illustrated. A sieving apparatus IO'comprises a mesh frame 12 and mesh 14 as for the apparatus 10. An ultrasonic transducer T, for excitation of the mesh 14 6 is mounted on a resonator 16', which in turn is mounted an the mesh frame 12 by means of an ultrasonic de-coupler 18' and a bracket 20'.
The resonator 16' is a substantially circular planar element with a circular swelling on one face in the middle, to which the transducer T is attached, the other face being flat and in-use in sonic contact with the mesh 14. The de-coupler 18' takes the form of a raised annulus on the same face as the swelling but spaced radially outwardly therefrom.
The first dimensions of the resonator 16' and the second dimensions of the de-coupler 18' are such that the de-coupler 18' is connected to the resonator 16' at a diaphragm mode node in order to minimise excitation of the de-coupler 18', bracket 20' and mesh frame 14.
It should be noted that the apparatus 10' only comprises a first resonator 16' and does not include a second resonator, as for the embodiment previously described.
The de-coupler of the invention may be applied to a circular sieve, as in the embodiment described above, or to sieves of other shapes such as, for example, square or rectangular sieves. Likewise the separation medium need not be a sieve mesh but could take any other appropriate form such as a punched plate, membrane, wedgewire etc., for either liquid or powder use.
The resonator employed with the de-coupler may simply be in mechanical contact with the separation medium or may be securely fixed to it by, for example, gluing, welding or soldering, but clearly it must be in sonic contact.
Referring now to Figures 6 to 9, tl-u-ee alternative embodiments of sieving apparatus 30, 50, 70, are illustrated.
The apparatus 3_)0 comprises a rectangular mesh frame 32, mesh 34, first resonator 36 and de-coupler 38, brackets 40, and a second resonator 42 in the form of an extended cross. The first resonator 36 and de-coupler 38, and a transducer (not shown) are mounted on the centre of the cross 42.
7 The apparatus 50 comprises a rectangular mesh frame 52, mesh 54, first resonators 56 and de-couplers 58 mounted on brackets 60, and a second resonator 62 in the form of an extended longitudinal element.
The apparatus 70 comprises a rectangular mesh frame 72, mesh 74, first resonator 76 and de-coupler 78 mounted on bracket 80, and a second resonator 82 in the form of an extended U-shaped element.
In the embodiments described above with reference to Figures 6 to 8, the first resonator and de-coupler are of the same form as for the apparatus 10 described with reference to Fi-ure 1.
In the present specification "comprise" means "includes or consists of' and "comprising" means "including or consisting of'.
The features disclosed in the foregoing description, or the following claims, or the accompanying drawings, expressed in their specific forms or in terms of a means for perfori-ning the disclosed function, or a method or process for attaining the disclosed result, as appropriate, may, separately, or in any combination of such features, be utilised for realising the invention in diverse forms thereof
Claims (11)
1. An ultrasonic sieving apparatus comprising a de-coupler for enabling a combination of a transducer and a first resonator to be supported with respect to a sieve which includes a separation medium provided in a frame, such that vibrations generated by the transducer are transmitted to the separation medium via the first resonator, the first resonator being of substantially circular cross-section and having first dimensions, wherein the ultrasonic de-coupler is of substantially circular cross-section and of second dimensions connected to and concentrically with the first resonator and which in use is attached to a bracket adapted to mount the de-coupler onto the frame, the first dimensions of the first resonator being such that the first resonator is connected to the transducer at an anti-node and the second dimensions of the ultrasonic de-coupler being such that it is connected to the first resonator at a node.
2. An ultrasonic sieving apparatus comprising a de-coupler according to claim I wherein with the first resonator adapted to vibrate in a diaph. ragm mode when in use excited by the transducer the second dimensions of the ultrasonic de-coupler are such that in use it is attached to the bracket at a diaphragm mode node.
3. An ultrasonic sieving apparatus comprising a de-coupler according to claim 2 wherein the second dimensions of the ultrasonic de-coupler are such that in use it is attached to the bracket at a longitudinal mode node.
4. An ultrasonic sieving apparatus comprising a de-coupler according to any preceding claim wherein the de-coupler is substantially cylindrical.
9
5. An ultrasonic sieving apparatus comprising a de-coupler according to any one of claims I to 3 wherein the de-coupler is of variable substantially circular cross-section along its length.
6. An ultrasonic sieving apparatus comprising a de-coupler according to any one of the preceding claims wherein the de-coupler includes a number of portions spaced apart around the generally circular crosssection, with gaps therebetween.
7. An ultrasonic sieving apparatus comprising a de-coupler according to any one of the preceding claims wherein the first resonator is substantially cylindrical.
8. An ultrasonic sieving apparatus comprising a de-coupler accordin to ?_ 9 any one of the preceding claims wherein the separation medium comprises a mesh.
9. An ultrasonic sieving apparatus according to any preceding claim wherein it further comprises a second resonator adapted to transmit the ultrasonic vibrations fi-om the first resonator to the separation medium.
10. An ultrasonic sieving apparatus substantially as hereinbefore described with reference to Figures 2, _3) and 4, or Figure 5, or Figures 3 and 6, or Figures 3 and 7 or Figures 3) and 8 of the accompanying drawings.
11. Any novel feature or novel combination of features as herein defimed and/or shown in the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9822880.2A GB9822880D0 (en) | 1998-10-21 | 1998-10-21 | Improved efficiency ultrasonic sieving apparatus |
Publications (3)
Publication Number | Publication Date |
---|---|
GB9923513D0 GB9923513D0 (en) | 1999-12-08 |
GB2343392A true GB2343392A (en) | 2000-05-10 |
GB2343392B GB2343392B (en) | 2002-04-17 |
Family
ID=10840900
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GBGB9822880.2A Ceased GB9822880D0 (en) | 1998-10-21 | 1998-10-21 | Improved efficiency ultrasonic sieving apparatus |
GB9923513A Expired - Fee Related GB2343392B (en) | 1998-10-21 | 1999-10-06 | Improved efficiency ultrasonic sieving apparatus |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GBGB9822880.2A Ceased GB9822880D0 (en) | 1998-10-21 | 1998-10-21 | Improved efficiency ultrasonic sieving apparatus |
Country Status (7)
Country | Link |
---|---|
US (1) | US6079569A (en) |
EP (1) | EP0996109B1 (en) |
JP (1) | JP2000126685A (en) |
AT (1) | ATE272244T1 (en) |
DE (1) | DE69918922T2 (en) |
ES (1) | ES2224523T3 (en) |
GB (2) | GB9822880D0 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004050263A1 (en) * | 2002-12-02 | 2004-06-17 | Russell Finex Limited | Sieving apparatus |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2809640B1 (en) * | 2000-05-30 | 2002-12-13 | Cogema | POWDER SCREENING METHOD AND DEVICE |
JP2002011409A (en) * | 2000-06-30 | 2002-01-15 | Honda Electronic Co Ltd | Ultrasonic sieving device |
US6543620B2 (en) * | 2001-02-23 | 2003-04-08 | Quality Research, Development & Consulting, Inc. | Smart screening machine |
GB0122852D0 (en) * | 2001-09-21 | 2001-11-14 | Russel Finex | Seiving apparatus |
NO326594B1 (en) * | 2005-03-18 | 2009-01-19 | Cubility As | Screening apparatus and method using the same |
JP4729385B2 (en) * | 2005-11-08 | 2011-07-20 | 株式会社村上精機工作所 | Vibrating sieve device |
DE102012108529A1 (en) * | 2012-09-12 | 2014-03-13 | Artech Systems Ag | Apparatus and method for ultrasonic sieving |
EP3268137B1 (en) * | 2015-03-10 | 2023-11-01 | Telsonic Holding AG | Screening system, eddy-current screening machine, and use of a screening system or of an eddy-current screening machine |
DE102015114076B3 (en) * | 2015-06-18 | 2016-05-25 | assonic Mechatronics GmbH | screening system |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996029156A1 (en) * | 1995-03-21 | 1996-09-26 | Sweco, Incorporated | Screening system |
US5653346A (en) * | 1993-05-26 | 1997-08-05 | Telsonic Ag | Process and device for sifting, sorting, screening, filtering or sizing substances |
US5799799A (en) * | 1996-05-06 | 1998-09-01 | Kason Corporation | Ultrasonic screening system |
JPH11128842A (en) * | 1997-10-27 | 1999-05-18 | Koei Sangyo Kk | Vibrating sifter with ultrasonic oscillator |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2880871A (en) * | 1953-01-26 | 1959-04-07 | Rheinische Werkzeug & Maschf | Process and device for sifting solid and liquid materials |
GB1462866A (en) * | 1973-06-18 | 1977-01-26 | Russel Finex | Vibratory sieving apparatus |
SU542572A1 (en) * | 1975-06-13 | 1977-01-15 | Всесоюзный научно-исследовательский институт строительного и дорожного машиностроения | Vibrating screen |
US4816144A (en) * | 1986-02-13 | 1989-03-28 | Russell Finex Limited Of Russell House | Sieving apparatus |
GB2225259B (en) * | 1988-11-14 | 1992-12-23 | Russel Finex | Sieving apparatus |
FR2671743B1 (en) * | 1991-01-17 | 1993-06-18 | Duburque Dominique | DEVICE FOR ULTRASONIC VIBRATION OF A NON-TUNED STRUCTURE. |
FR2682050B1 (en) * | 1991-10-08 | 1994-07-22 | Chauvin Sarl Ets | SCREENING DEVICE EQUIPPED WITH DECOLMATION MEANS. |
US5890580A (en) * | 1993-07-12 | 1999-04-06 | Kaijo Corporation | Object levitating apparatus, object transporting apparatus, and object levitating bearing along with an object levitating process and object transporting process |
US5398816A (en) * | 1993-07-20 | 1995-03-21 | Sweco, Incorporated | Fine mesh screening |
US5595306A (en) * | 1995-05-22 | 1997-01-21 | Emerson Electric Co. | Screening system |
US6003679A (en) * | 1997-05-07 | 1999-12-21 | Maroscher; Victor William | Sieving device with duel independent frequency input |
DE19811266C1 (en) * | 1998-03-11 | 1999-08-05 | Hielscher Gmbh | Method of cleaning filter frames |
-
1998
- 1998-10-21 GB GBGB9822880.2A patent/GB9822880D0/en not_active Ceased
-
1999
- 1999-10-06 GB GB9923513A patent/GB2343392B/en not_active Expired - Fee Related
- 1999-10-11 EP EP99120272A patent/EP0996109B1/en not_active Expired - Lifetime
- 1999-10-11 ES ES99120272T patent/ES2224523T3/en not_active Expired - Lifetime
- 1999-10-11 DE DE69918922T patent/DE69918922T2/en not_active Expired - Lifetime
- 1999-10-11 AT AT99120272T patent/ATE272244T1/en active
- 1999-10-14 US US09/418,438 patent/US6079569A/en not_active Expired - Lifetime
- 1999-10-21 JP JP11299583A patent/JP2000126685A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US5653346A (en) * | 1993-05-26 | 1997-08-05 | Telsonic Ag | Process and device for sifting, sorting, screening, filtering or sizing substances |
WO1996029156A1 (en) * | 1995-03-21 | 1996-09-26 | Sweco, Incorporated | Screening system |
US5799799A (en) * | 1996-05-06 | 1998-09-01 | Kason Corporation | Ultrasonic screening system |
JPH11128842A (en) * | 1997-10-27 | 1999-05-18 | Koei Sangyo Kk | Vibrating sifter with ultrasonic oscillator |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004050263A1 (en) * | 2002-12-02 | 2004-06-17 | Russell Finex Limited | Sieving apparatus |
GB2410708A (en) * | 2002-12-02 | 2005-08-10 | Russel Finex | Sieving apparatus |
GB2410708B (en) * | 2002-12-02 | 2006-01-11 | Russel Finex | Sieving apparatus |
US7497338B2 (en) | 2002-12-02 | 2009-03-03 | Russell Finex Limited | Sieving apparatus |
US7694826B2 (en) | 2002-12-02 | 2010-04-13 | Russell Finex Limited | Sieving apparatus |
Also Published As
Publication number | Publication date |
---|---|
DE69918922T2 (en) | 2005-01-05 |
GB2343392B (en) | 2002-04-17 |
EP0996109A2 (en) | 2000-04-26 |
GB9923513D0 (en) | 1999-12-08 |
EP0996109B1 (en) | 2004-07-28 |
JP2000126685A (en) | 2000-05-09 |
GB9822880D0 (en) | 1998-12-16 |
EP0996109A3 (en) | 2000-12-27 |
DE69918922D1 (en) | 2004-09-02 |
ES2224523T3 (en) | 2005-03-01 |
ATE272244T1 (en) | 2004-08-15 |
US6079569A (en) | 2000-06-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20181006 |