EP1173393A1 - Verfahren zur erzeugung eines im infraroten spektralbereich einseitig transparenten tarnnebels - Google Patents
Verfahren zur erzeugung eines im infraroten spektralbereich einseitig transparenten tarnnebelsInfo
- Publication number
- EP1173393A1 EP1173393A1 EP00901069A EP00901069A EP1173393A1 EP 1173393 A1 EP1173393 A1 EP 1173393A1 EP 00901069 A EP00901069 A EP 00901069A EP 00901069 A EP00901069 A EP 00901069A EP 1173393 A1 EP1173393 A1 EP 1173393A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pyrotechnic
- particles
- aerosol
- fog
- mist
- 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
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000000779 smoke Substances 0.000 title abstract description 7
- 238000012216 screening Methods 0.000 title abstract 3
- 238000002329 infrared spectrum Methods 0.000 title abstract 2
- 239000002245 particle Substances 0.000 claims abstract description 38
- 230000005855 radiation Effects 0.000 claims abstract description 27
- 239000000443 aerosol Substances 0.000 claims abstract description 21
- 239000003595 mist Substances 0.000 claims description 18
- 230000003595 spectral effect Effects 0.000 claims description 13
- 230000000007 visual effect Effects 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 7
- 239000010453 quartz Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 4
- 230000007480 spreading Effects 0.000 claims description 4
- 238000003892 spreading Methods 0.000 claims description 4
- 235000019270 ammonium chloride Nutrition 0.000 claims description 2
- 235000010333 potassium nitrate Nutrition 0.000 claims description 2
- 239000004323 potassium nitrate Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- GUBGYTABKSRVRQ-XLOQQCSPSA-N Alpha-Lactose Chemical compound O[C@@H]1[C@@H](O)[C@@H](O)[C@@H](CO)O[C@H]1O[C@@H]1[C@@H](CO)O[C@H](O)[C@H](O)[C@H]1O GUBGYTABKSRVRQ-XLOQQCSPSA-N 0.000 claims 1
- GUBGYTABKSRVRQ-QKKXKWKRSA-N Lactose Natural products OC[C@H]1O[C@@H](O[C@H]2[C@H](O)[C@@H](O)C(O)O[C@@H]2CO)[C@H](O)[C@@H](O)[C@H]1O GUBGYTABKSRVRQ-QKKXKWKRSA-N 0.000 claims 1
- 239000008101 lactose Substances 0.000 claims 1
- 230000002745 absorbent Effects 0.000 abstract description 2
- 239000002250 absorbent Substances 0.000 abstract description 2
- 238000001429 visible spectrum Methods 0.000 abstract 2
- 238000001228 spectrum Methods 0.000 abstract 1
- 230000001419 dependent effect Effects 0.000 description 4
- 238000001931 thermography Methods 0.000 description 4
- 241000475481 Nebula Species 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000005670 electromagnetic radiation Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000001069 Raman spectroscopy Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
- F41H9/00—Equipment for attack or defence by spreading flame, gas or smoke or leurres; Chemical warfare equipment
- F41H9/06—Apparatus for generating artificial fog or smoke screens
Definitions
- the present invention relates to a method for producing a camouflage mist which is transparent on one side in the infrared spectral range and which is opaque in the visible range, scattered particles of a suitable order of magnitude being applied in an aerosol by means of infrared radiation, so that there is a pronounced forward scattering on the scattering particles .
- the aerosol itself consists of a known camouflage mist that is highly absorbent in the visible range.
- camouflage nebulas provide very good protection in both the visual and infrared spectral range, they have the disadvantage that during the time, in that the fog is impenetrable (usually about 20 - 60 seconds) not only the fog generator, but also the opponent can change the position, so that for a subsequent deployment not only your opponent but also your opponent's position can be determined again got to.
- the mist dispenser would therefore have a significant tactical advantage if it can camouflage its own actions during the effective phase of the artificial fog, but at the same time it can also track and react to the opponent's actions.
- the object of the invention is therefore to develop a camouflage mist which is transparent on one side.
- the known camouflage mists usually consist of aerosols of solid or liquid particles, the size of the individual particles being of the order of the wavelength of the radiation to be attenuated, so that they are suitable for scattering and absorption of the light.
- a one-way permeable visual barrier is achieved by lighting up a transparent artificial mist consisting of aerosol particles or gases by irradiation with electromagnetic radiation of the appropriate wavelength (fluorescence, Raman scattering, diffuse reflection). Since this lighting up is an isotropic effect, ie it also takes place on the side of the mist dispenser, a pulsed radiation source is used, the pulse frequency of which is adapted to the duration of the emission effects.
- the detector of the fog user is switched off during the irradiation time by means of a shutter, so that only electromagnetic radiation is detected during the pauses in irradiation.
- the radiation frequency is typically so high that the opponent sees a continuously emitting nebula.
- the pulse train of the radiation source is modulated by an algorithm that is not known to the opponent.
- the disadvantages of this method are, on the one hand, the devices required for the complex, expensive and susceptible excitation and detection method and, on the other hand, the toxicologically questionable fluorescent substances in the cloud of fog required for the radiation excitation.
- the invention solves the problems described above by generating a fog which is transparent on one side in the infrared spectral range and has the features of the main claim.
- the solution is promoted by the means described in the subclaims.
- this nebula successfully detects the opponent by means of suitable electronic aids (IR camera), while the opponent is deprived of both the visual and infrared spectral range by overexposure to the LOS (Line of sight).
- IR camera electronic aids
- This two-component mist is irradiated with an IR radiation source from the side of the mist dispenser.
- a schematic representation of the configuration can be seen in FIG. For both sides, the visual spectral range is covered by the first fog component 6.
- Irradiation with electromagnetic waves in the IR range which is provided either by a powerful lamp with appropriate filters or by means of a pyrotechnic radiator 2, causes the forward scattering 7 of the IR radiation in the second fog component, the scattered particles 5, to be characteristic Direction of the opponent 9, while the backscattered portion of the IR radiation 10 remains negligibly small.
- the resulting radiation in the direction of the opponent 9 prevents the observation of the fog generator 1 by means of an IR camera 8 (typical detection wavelengths: 8.0 - 14.0 ⁇ m), while the observation of the opponent 9 with the IR camera of the fog generator 3 is problem-free is possible.
- an IR camera 8 typically detection wavelengths: 8.0 - 14.0 ⁇ m
- ⁇ 10.0 ⁇ m was chosen as the reference wavelength.
- the quartz particle is located in the center of the polar diagram in FIG. 2.
- the incident electromagnetic wave is scattered coming from the 180 ° direction.
- the phase function P is plotted, which is the arithmetic mean of the scattered light intensity I-, the wave polarized perpendicular to the scattering plane and the scattered light intensity l 2 of the wave polarized parallel to the scattering plane. You can see that extremely pronounced forward scatter and the negligible intensity of the lateral or backward scattered parts.
- Scattering particles with a radius of 5 - 50 ⁇ m, i.e. a size of 10 - 100 microns, are therefore particularly suitable for such anisotropic scattering of IR light. Since it is only the size of the scatter that is important and not the chemical composition, solid particles that are not toxic or irritating to the respiratory tract and are environmentally friendly were preferred. Quartz or glass powder, organic or inorganic salts are particularly suitable.
- the data of a typical aerosol particle of a mist that is only effective in the VIS area consisting of red phosphorus, potassium nitrate and ammonium chloride, is used for scattered light analysis. After burning off with the air humidity, these form fine droplets that absorb the VIS light.
- the particle radius is 0.27 ⁇ m, i.e. H.
- the size parameter x results in 0J7.
- Figure 3 shows the corresponding radiation diagram. There is an almost isotropic intensity distribution. The intensity of the scattered electromagnetic wave is two orders of magnitude smaller than that of the quartz particle, i.e. when irradiated with an IR light source, there will be no one- or two-sided cross-fading.
- the quartz particle thus generates an efficient and strongly directed scatter radiation of the incident electromagnetic wave in the direction of the opponent.
- the difference between the radiation intensity of the target object and the radiation intensity of the background at the location of the detector must fall below a threshold value which is dependent on the respective thermal imaging device.
- the contrast function c (r) which is dependent on the distance r and is defined as
- the intensity of the target object at distance r results in
- T (r) is the transmission at a distance r
- l p (r) is the sum of the intensities radiated into the LOS (e.g. forward scattering on aerosol particles). The following applies accordingly to the intensity of the background at a distance r:
- the contrast threshold c K ⁇ t at which the target object can no longer be distinguished from the background in the thermal imaging device, is typically 0.35; the contrast without attenuation is 1.35.
- the contrast drops at a ratio of l p / l b (0)> 2 below the threshold value of 0.35, ie the target object can then no longer be detected by the thermal imaging device.
- the intensity of the IR radiation source of the mist dispenser must be in this Achieve a power of at least 1200 - 4000 W m '2 sr "1 in the wavelength range, so that the contrast in the thermal image of the opponent falls below the contrast threshold and therefore the target object can no longer be detected.
- Mist dispenser IR radiation source IR camera of the mist dispenser. Mist throwing body. Size-adjusted scattering particle. Fog component acting in the VIS area. Forward scattering of the electromagnetic wave. IR camera of the opponent. Opponent backward scattering of the electromagnetic wave
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Glass Compositions (AREA)
- Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
- Optical Radar Systems And Details Thereof (AREA)
- Spectrometry And Color Measurement (AREA)
- Radar Systems Or Details Thereof (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
- Manufacturing Of Electric Cables (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19914033 | 1999-03-27 | ||
| DE19914033A DE19914033A1 (de) | 1999-03-27 | 1999-03-27 | Verfahren zur Erzeugung eines im infraroten Spektralbereich einseitig transparenten Tarnnebels |
| PCT/EP2000/000062 WO2000058239A1 (de) | 1999-03-27 | 2000-01-07 | Verfahren zur erzeugung eines im infraroten spektralbereich einseitig transparenten tarnnebels |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1173393A1 true EP1173393A1 (de) | 2002-01-23 |
| EP1173393B1 EP1173393B1 (de) | 2004-03-17 |
Family
ID=7902698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00901069A Expired - Lifetime EP1173393B1 (de) | 1999-03-27 | 2000-01-07 | Verfahren zur erzeugung eines im infraroten spektralbereich einseitig transparenten tarnnebels |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US6484640B1 (de) |
| EP (1) | EP1173393B1 (de) |
| JP (1) | JP2002540059A (de) |
| AT (1) | ATE261920T1 (de) |
| DE (2) | DE19914033A1 (de) |
| DK (1) | DK1173393T3 (de) |
| ES (1) | ES2216851T3 (de) |
| IL (2) | IL145010A0 (de) |
| PT (1) | PT1173393E (de) |
| TR (1) | TR200102721T2 (de) |
| WO (1) | WO2000058239A1 (de) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6989525B2 (en) * | 2003-05-14 | 2006-01-24 | Lockheed Martin Corporation | Method for using very small particles as obscurants and taggants |
| DE102005020159B4 (de) * | 2005-04-29 | 2007-10-04 | Rheinmetall Waffe Munition Gmbh | Tarn- und Täuschmunition zum Schutz von Objekten gegen Lenkflugkörper |
| DE102006008309B4 (de) * | 2006-02-23 | 2008-03-27 | Diehl Bgt Defence Gmbh & Co. Kg | Nebelwurfkörper |
| RU2342353C1 (ru) * | 2007-05-22 | 2008-12-27 | Сергей Николаевич Чувашев | Способ экранировки инфракрасного излучения |
| RU2425018C2 (ru) * | 2009-06-03 | 2011-07-27 | Открытое акционерное общество "Научно-производственное объединение "Сатурн" (ОАО "НПО "Сатурн") | Способ экранирования электромагнитных излучений требуемых диапазонов длин волн объекта |
| DE102011106201A1 (de) | 2011-06-07 | 2012-12-13 | Rheinmetall Waffe Munition Gmbh | Verfahren zur Erzeugung eines einseitig transparenten Nebels |
| WO2012028257A1 (de) | 2010-08-31 | 2012-03-08 | Rheinmetall Waffe Munition Gmbh | Vorrichtung und verfahren zur erzeugung einer wirksamen nebelwand bzw. nebelwolke |
| US9032878B1 (en) * | 2013-08-30 | 2015-05-19 | The United States Of America As Represented By The Secretary Of The Army | Obscurant generating, ground-based, networked munition |
| US10415941B2 (en) * | 2016-08-11 | 2019-09-17 | The Boeing Company | System for visual obscuration of an object and dissipating energy of a laser weapon |
| US10926273B2 (en) * | 2019-01-31 | 2021-02-23 | Toyota Motor Engineering & Manufacturing North America, Inc. | Systems and methods for modifying an infrared signature of a vehicle |
| WO2024159489A1 (zh) * | 2023-02-02 | 2024-08-08 | 中国人民解放军火箭军工程大学 | 一种真空中干扰烟幕红外透过率复合检测装置及方法 |
| WO2025000103A1 (en) * | 2023-06-28 | 2025-01-02 | Kelryn Inc. | System and method of fog generation |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4210555A (en) | 1977-06-22 | 1980-07-01 | Nico-Pyrotechnik Hanns-Juergen Diederichs Kg | Process for the generation of dense clouds for camouflage purposes |
| DD300935A7 (de) | 1987-11-26 | 1992-09-10 | Schwarzheide Synthesewerk Veb | Verfahren zur erzeugung von tarnmitteln |
| DD301407A7 (de) | 1983-11-08 | 1992-12-24 | Paulmann | Gemisch zur Erzeugung von Tarnnebeln, vorzugsweise für den Ir-Bereich |
| DD301646A7 (de) | 1983-10-11 | 1993-05-19 | Paulmann | Gemisch zur Erzeugung von kombiniertem Signal- und Tarnnebel |
Family Cites Families (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5679921A (en) * | 1958-08-27 | 1997-10-21 | The United States Of America As Represented By The Secretary Of The Navy | Infra-red tracking flare |
| US3690971A (en) * | 1970-08-11 | 1972-09-12 | North American Rockwell | Pyrotechnic composition for colored smoke production |
| SE418495B (sv) * | 1978-03-31 | 1981-06-09 | Lennart Holm | Anvendning av partiklar av aktivt kol i aerosoler avsedda for stralningsabsorption serskilt inom ir-omradet |
| DE3238444C2 (de) | 1982-10-16 | 1986-10-30 | Pyrotechnische Fabrik F. Feistel GmbH + Co KG, 6719 Göllheim | Pyrotechnische Nebelsätze |
| DE3421708A1 (de) * | 1984-06-12 | 1985-12-12 | Buck Chemisch-Technische Werke GmbH & Co, 7347 Bad Überkingen | Einrichtung zur erzeugung einer scheinzielwolke, insbesondere einer infrarot-scheinzielwolke |
| US4704966A (en) * | 1986-05-16 | 1987-11-10 | Aai Corporation | Method of forming IR smoke screen |
| US4704967A (en) * | 1986-05-16 | 1987-11-10 | Aai Corporation | Method of assembly of compacted particulates and explosive charge |
| DE3918231A1 (de) * | 1989-06-03 | 1990-12-06 | Piepenbrock Pyrotechnik Gmbh | Verfahren zum erzeugen von im infraroten und sichtbaren licht deckenden nebeln |
| US5025729A (en) * | 1990-02-21 | 1991-06-25 | Cameron Robert W | Aerial distress flare |
| US5317163A (en) * | 1990-02-26 | 1994-05-31 | Dornier Gmbh | Flying decoy |
| DE4030430C1 (de) | 1990-09-26 | 1993-12-02 | Buck Chem Tech Werke | IR-undurchlässigen Nebel erzeugende Zusammensetzung |
| US5148173A (en) * | 1991-04-15 | 1992-09-15 | The United States Of America As Represented By The Secretary Of The Army | Millimeter wave screening cloud and method |
| EP0708749B1 (de) * | 1992-07-15 | 2000-08-09 | Cordant Technologies Inc. | Giessfähige infrarot-beleuchtungszusammensetzungen |
| DE4230826C1 (de) * | 1992-09-15 | 1994-03-03 | Buck Chem Tech Werke | Tarnverfahren zum Schützen eines militärischen Objekts und Tarnpartikel zu seiner Durchführung |
| DE4337071C1 (de) | 1993-10-29 | 1995-03-02 | Nico Pyrotechnik | Pyrotechnischer Nebelsatz für Tarnzwecke und dessen Verwendung in einem Nebelkörper |
| US5587552A (en) * | 1993-11-09 | 1996-12-24 | Thiokol Corporation | Infrared illuminating composition |
| GB2299990A (en) * | 1995-04-18 | 1996-10-23 | Secr Defence | Pyrotechnic material |
| DE19601506C2 (de) * | 1996-01-17 | 2000-05-18 | Rheinmetall W & M Gmbh | Verfahren und Vorrichtung zur Erzeugung einer Sichtsperre mit Hilfe eines künstlichen Nebels |
| US5682010A (en) * | 1996-12-04 | 1997-10-28 | The United States Of America As Represented By The Secretary Of The Army | Method for creating a one way visible screening smoke |
| US6047644A (en) * | 1998-03-18 | 2000-04-11 | The United States Of America As Represented By The Secretary Of The Army | Propellant based aerosol generating device and method of use |
-
1999
- 1999-03-27 DE DE19914033A patent/DE19914033A1/de not_active Withdrawn
-
2000
- 2000-01-07 ES ES00901069T patent/ES2216851T3/es not_active Expired - Lifetime
- 2000-01-07 DK DK00901069T patent/DK1173393T3/da active
- 2000-01-07 AT AT00901069T patent/ATE261920T1/de not_active IP Right Cessation
- 2000-01-07 TR TR2001/02721T patent/TR200102721T2/xx unknown
- 2000-01-07 PT PT00901069T patent/PT1173393E/pt unknown
- 2000-01-07 EP EP00901069A patent/EP1173393B1/de not_active Expired - Lifetime
- 2000-01-07 WO PCT/EP2000/000062 patent/WO2000058239A1/de not_active Ceased
- 2000-01-07 DE DE50005690T patent/DE50005690D1/de not_active Expired - Lifetime
- 2000-01-07 JP JP2000607946A patent/JP2002540059A/ja active Pending
- 2000-01-07 IL IL14501000A patent/IL145010A0/xx active IP Right Grant
- 2000-01-07 US US09/937,615 patent/US6484640B1/en not_active Expired - Fee Related
-
2001
- 2001-08-21 IL IL145010A patent/IL145010A/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4210555A (en) | 1977-06-22 | 1980-07-01 | Nico-Pyrotechnik Hanns-Juergen Diederichs Kg | Process for the generation of dense clouds for camouflage purposes |
| DD301646A7 (de) | 1983-10-11 | 1993-05-19 | Paulmann | Gemisch zur Erzeugung von kombiniertem Signal- und Tarnnebel |
| DD301407A7 (de) | 1983-11-08 | 1992-12-24 | Paulmann | Gemisch zur Erzeugung von Tarnnebeln, vorzugsweise für den Ir-Bereich |
| DD300935A7 (de) | 1987-11-26 | 1992-09-10 | Schwarzheide Synthesewerk Veb | Verfahren zur erzeugung von tarnmitteln |
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| Title |
|---|
| "Chemie - interessante Reaqktionen, die auch in Feuerwerkskörpern Verwendung finden", REAKTIONEN, pages 1, XP002959730, Retrieved from the Internet <URL:http://www.titan.spaceports.com> [retrieved on 20030117] |
| WALTER B.: "Formeln für ein Teilchengemisch", MET DST, 24 June 1997 (1997-06-24), pages 1 - 4, XP002959731, Retrieved from the Internet <URL:http://first.gmd.de/persons/bwalter/html/report/node31.html> [retrieved on 20030117] |
Also Published As
| Publication number | Publication date |
|---|---|
| TR200102721T2 (tr) | 2002-01-21 |
| IL145010A (en) | 2006-12-31 |
| PT1173393E (pt) | 2004-08-31 |
| EP1173393B1 (de) | 2004-03-17 |
| JP2002540059A (ja) | 2002-11-26 |
| ES2216851T3 (es) | 2004-11-01 |
| ATE261920T1 (de) | 2004-04-15 |
| DE19914033A1 (de) | 2000-09-28 |
| US6484640B1 (en) | 2002-11-26 |
| DK1173393T3 (da) | 2004-08-02 |
| DE50005690D1 (de) | 2004-04-22 |
| WO2000058239A1 (de) | 2000-10-05 |
| IL145010A0 (en) | 2002-06-30 |
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