AT823U1 - Filters for brewing beverages, in particular coffee filters and method for producing such a filter - Google Patents

Filters for brewing beverages, in particular coffee filters and method for producing such a filter Download PDF

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Publication number
AT823U1
AT823U1 AT49595U AT49595U AT823U1 AT 823 U1 AT823 U1 AT 823U1 AT 49595 U AT49595 U AT 49595U AT 49595 U AT49595 U AT 49595U AT 823 U1 AT823 U1 AT 823U1
Authority
AT
Austria
Prior art keywords
filter
pores
fiber density
pore size
coffee
Prior art date
Application number
AT49595U
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German (de)
Original Assignee
Melitta Haushaltsprodukte
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
Priority to DE19513600A priority Critical patent/DE19513600C5/en
Application filed by Melitta Haushaltsprodukte filed Critical Melitta Haushaltsprodukte
Publication of AT823U1 publication Critical patent/AT823U1/en
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7759409&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=AT823(U1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.

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Classifications

    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J31/00Apparatus for making beverages
    • A47J31/06Filters or strainers for coffee or tea makers ; Holders therefor
    • A47J31/08Paper filter inlays therefor to be disposed after use
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/24Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y10T428/24992Density or compression of components

Description

AT 000 823 Ul
The invention relates to a filter for infusion beverages, in particular a coffee filter that has pores, and a method for producing such a filter.
Coffee filters made of paper are known, such as the filter bags from the applicant. These coffee filters are creped to enlarge their surface and have pores that are difficult or impossible to see. DE-GM 69 39 904 describes coffee filters with a pore size between 5 μτα to 20 μτη, which enable aromatic-bearing colloidal particles to pass through the filter.
DE-OS 28 02 240, DE-OS 34 34 687, DE-OS 36 42 898 and DE-OS 41 35 660 relate to coffee filters made of film-like material made of plastic or metal, in which sharp-edged holes or pores are formed. 2 AT 000 823 Ul
The invention has for its object to provide a filter for infusion beverages, in particular a coffee filter that is easy to manufacture and improves the filtrate, such as coffee, and a method for producing such a filter.
This object is achieved with a filter or a method for producing a filter according to the claims.
The invention is based on the idea of providing a filter for infusion beverages, in particular a coffee filter, which is made of flow paper-like, fleece-like or fibrous material in the pores with an average pore size of at least about 0.1 mm, measured at a fiber density is about 50% of the original fiber density of the material; preferred is a maximum average pore size of about 0.6 to about 0.7 mm and more preferably from about 0.3 mm to about 0.4 mm. A range of an average pore size of 0.15 to 0.25 mm is particularly preferred.
A filter according to the invention is made from suitable papers and nonwovens made from natural and / or synthetic fibers based on cellulose and / or from fibers made from synthetic polymers and from mixtures of the fibers mentioned. The basis weight of preferred materials is about 10 to about 100 g / mJ. The fibrous material is preferably filter paper, as has previously been used for the Filtertüten®. When the pores are formed in this material, which is preferably done by needles or water jets, the edges or edges of the pores are not sharp, but, due to the fibrous material, are out of focus or " frayed " or porous.
Pores of this size are particularly easy to manufacture and in particular improve the taste of the coffee filtrate. Surprisingly, despite 3 AT 000 823 μl of their relatively large mean pore size, these pores filter even powder particles, such as coffee particles, which have a much smaller size, down to 10 μm. This effect is probably due to the relatively large capillary forces acting on the blurred edges of the pores.
The filtration capacity or flow rate of the filter is increased by forming pores with average pore sizes of greater than approximately 0.1 mm. This prevents clogging problems or overflowing of the filter, especially when used in coffee machines. The larger pores in the filter also allow significantly more colloidal, aromatic-carrying particles to pass through the filter, and alkaloids, such as caffeine, which are easily adsorbed by conventional paper filters when brewing coffee, are not retained as in conventional paper filters. This improves the taste of the filtrate, especially when brewing coffee.
When using the fibrous material with such large pores, the possible swelling of the filter material does not reduce the transmission properties of the filter as markedly as with conventional filter papers.
The enlargement of the pore size compared to conventional coffee filters made of paper has the further advantage that the filter according to the invention can be used for a variety of infusion beverages, especially for other, less common types of coffee, such as espresso, malt, grain, caramel coffee. Creping the filter material is also no longer necessary, which has a cost-reducing effect.
Due to the average pore size of up to 0.6 mm or even at 0.7 mm in the fibrous material, the formation of batches in the filtrate and the marked clouding of the filtrate are prevented. 4 AT 000 823 Ul
A preferred mean pore size range of about 0.1 mm to about 0.4 mm and more preferably up to about 0.3 mm also retains lipids contained in the coffee so that they do not get into the filtrate and adversely affect the cholesterol values of the consumer can. It has been demonstrated that the lipids contained in coffee in particular can permanently increase the cholesterol content in the blood of consumers and can have a health hazard (cf., "Identity of the cholesterol-raising factor from boiled coffee and its effects on liver function enzymes" in Journal of Lipid Research, vol. 35, 1994).
The free pore area is preferably up to 20% of the total filter area. It has been found that such a proportion of free pore surface enables a satisfactory filter effect because of the porosity already present in the filter paper. If there is a large proportion of free perforated area, block formation in the filtrate occurs more frequently. With an average pore size of about 0.3 mm in a filter according to the invention and a free pore area of 20%, there is still no increased permeability for the coffee lipids which have an adverse effect on health and undesirable effects.
It has also been found that the processability and tear strength of a paper is not impaired by the specified range of average pore sizes, so that the filter according to the invention remains stable, filter parts connected by embossing are not weakened, and other packaging and processing problems are avoided.
The average pore size and / or the surface density of the pores preferably increases toward the area of the filter located below in use. This intensifies the throughput in the lower area of the filter, that is to say in the area in which larger amounts of coffee are found compared to the other areas. The permeability of the filter according to the invention is preferably adjusted so that the passage of filtrate through the filter remains approximately constant over the amount of liquid in the filter. This compensates for differences in permeability due to different amounts of beverage particles and different pressures, and the infusion material is used better and more evenly.
In a filter according to the invention, the pores are further preferably designed and arranged in such a way that they form a specific perforation line along which the filter can be deliberately reduced by separating the perforation line. For example, with a coffee filter the filter intended for a filter holder of size 1x4 can be reduced for a filter holder of size 1x2.
Additionally or alternatively, the pores can be designed and arranged in such a way that they form certain kink lines in the filter, which support opening of the filter at certain points, such as in the vicinity of the embossments.
The objects, advantages and features of the invention are explained in more detail below on the basis of examples and with reference to the drawing. Show it:
1 shows a schematic illustration of a side view of an embodiment of the filter according to the invention, FIG. 2 shows an enlarged detail A from FIG. 1 with a schematic illustration of preferred pores,
3 shows an enlarged detail A from FIG. 1 with a further embodiment of preferred pores,
4 shows a schematic enlargement of section B from FIG. 2,
5 shows a representation of the distribution of the fibrous material in the region of a pore according to FIG. 4, 6 AT 000 823 Ul
6 shows a SEM image with a 100-fold magnification of a pore formed in a filter according to the invention.
7 is a SEM recording according to FIG. 6 with 200x magnification,
8 is a SEM image with a 102-fold magnification of a filter according to the invention with a pore formed by a water jet,
9 is a SEM image with a 106x magnification of a filter according to the invention with a further pore formed by a water jet,
10 shows an SEM image with a 400-fold magnification of a filter according to the invention with a pore formed by voltage discharge,
11 is a SEM image of a further pore formed by voltage discharge according to FIG. 8,
12 shows a statistical diagram with the coffee grounds contents of coffee filtrates filtered with different filters,
FIG. 13 shows a further statistical diagram with the coffee grounds contents of coffee filtrates filtered with different filters, and
14 shows the flow rate as a function of the pore area.
The filter 1 according to the invention according to FIG. 1 is preferably formed by two layers of filter material folded onto one another. These layers are along the lower and a lateral edge area 3, e.g. connected by embossing. The uppermost layer 2 of the filter material can be seen in FIG.
The filter material has pores 5, e.g. shown in Figures 2 and 3. These pores 5 are preferably arranged and formed along a line 4 such that they form a perforation line through both layers of the filter. The upper part of the filter can then be easily separated along this perforation line 4 in order to be able to use the filter 7 AT 000 82S Ul also for a smaller filter holder. Outside the edge area 3, but in the vicinity thereof, the pores also preferably form kink lines 6, so that the filter easily opens and opens in a known filter holder, e.g. to facilitate the filling of coffee powder.
It can be seen from FIGS. 2 and 3 that the pores 5 in the filter according to the invention can have any shape as long as they have an effective mean pore size d of at least about 0.1 mm and preferably up to about 0.7 mm measured at a fiber density that is about 50% of the original fiber density of the material.
The essentially round pores 5 shown in FIG. 2 are preferred because they can be formed by a relatively simple processing of the filter material. The pores are preferably formed in the fibrous material by drilling, slitting, heat or voltage discharges. More preferably, the fibrous material is rolled with a needle roller or processed by water jets. Needling to form the filter according to the invention is particularly simple to carry out and has compared to other methods, such as e.g. the formation of pores by laser, milling or punching a great cost and structural advantage, which is described in more detail below. When the fibrous material is needled by a needle roller, the pores in the top view are slightly pear-shaped, which is caused by the pivoting movement of the needles attached to the roller to the web of material being passed.
FIG. 4 shows an enlargement of section B from FIG. 2. In particular, it should be made clear that a pore formed according to the invention in fibrous material does not have a sharp edge, but one that is unsharp or porous. Such a structure is e.g. caused by the needling of the fibrous material, which primarily displaces 8 AT 000 823 Ul partially elastic material and does not remove it. Due to the fiber character of the material, a pore with an average pore size d is formed. This structure causes an increase in the capillary forces of the liquid to be filtered, particularly at the pore edges, which increases the filtering effect of the easily produced pores.
Fig. 5 shows the statistical distribution of the fibrous material in the area of a pore, e.g. a pore according to FIG. 4. The pore width is plotted on the horizontal axis and the fiber density in the region of the pore on the vertical axis. In the vicinity of the pore, the fiber density of the material decreases towards the center of the pore. The slope of the statistical distribution depends on the material and the type of pore formation. With an average pore size d, the fiber density is by definition 50% of the fiber density of the original material (" half-value density ").
A preferred material has a pore size d ^ Q, which corresponds to 90% of the average pore size d, a fiber density of about 0% to about 40%. A fiber density at the pore size d90 of about 0 to 20% and even more preferably of about 5% to 15% of the original fiber density is particularly preferred, but particularly 10%.
The fibrousness of the material in the area of the pore has to be matched to the chemical and physical consistency of the infusion material.
The SEM images according to FIGS. 6 and 7 clearly show the unsharp edge of a pore in a filter according to the invention. In part, the fibers of the fibrous material are displaced to the edge by the needling and are partially torn or severed. 9 AT 000 823 Ul
FIGS. 8 and 9 represent pores formed by water jets. With these pores, the fiber density changes only very slowly towards the center of the pore. Macroscopically, a filter treated in this way has a coarse structure with microscopic free passage openings.
Figures 10 and 11 show that the formation of the pores by voltage discharge apparently welds the fibers together at the edges of the pores and forms a porous structure at the edges.
12 shows a statistical diagram for sentence determination. The statistically significant difference to the reference R (LORD test, two-sided, 95% probability) was shown with one. The mean values x with the standard deviations S are shown in each case. The first four patterns are unperforated conventional coffee filter comparison papers. In the fifth place is a so-called " gold filter " which consists of a slotted metal foil with pores measuring 0.18 mm x 2 mm. Sixth to tenth places show needled patterns of filters according to the invention with an average pore size of about 0.25 mm. In eleventh place is a " PJ2 " characterized sample of a filter according to the invention, in which the pores were formed by means of a water jet process with an average pore size of 0.2 to 0.3 mm. In the last place there is a drilled pattern, whereby pores with a diameter of 0.6 mm were formed in a conventional filter paper. All values shown come from machine brewing.
It becomes clear that the use of fibrous material significantly reduces the cloudiness of the coffee filtrate caused by the sentence compared to a filter with sharp-edged pores. 10 AT 000 823 ul
Fig. 13 in particular contrasts the sentence formation in a machine brewing with the sentence formation in a hand infusion. The first four patterns are conventional coffee filter papers. In the fifth place is a filter according to the invention perforated with a water jet method, such as the filter " PJ2 " in Figure 12, wherein the upper third of the filter was sealed with silicone. In the sixth position, a filter is shown that is completely perforated with a pore size of 0.6 mm. The filters already shown in connection with FIG. 12 then follow.
It can be clearly seen in FIG. 13 that the advantageous effect of filters according to the invention shown in connection with FIG. 12 increases significantly in the case of a hand infusion instead of a machine brewing.
Fig. 14 shows the flow rate of various samples depending on the pore area. The flow rate (mm / s) is a parameter of the filter paper determined on a test piece with a defined area and predefined water pressure and water temperature. The pore area is the product of the pore size (mm2) and the number of pores (per cm2), " r " is the statistical correlation coefficient for the best fit line.
In the water-blasted pattern, the flow rate is determined by the thin areas (greatly reduced fiber density) or porosity of the coffee filter paper and the additionally formed pores. This would correspond to an impermeable filter material with pores with a diameter of approximately 0.5 mm. Such a filter is therefore preferred for purposes in which a high flow rate is required despite good filtration, e.g. to prevent the filter from overflowing during automatic brewing in a coffee machine. 11

Claims (18)

  1. AT 000 823 Ul claims 1. Filters for infusion beverages, in particular coffee filters, wherein the filter (1) is made of fibrous material and pores (5) with an average pore size (d) of at least about 0.1 mm, measured at a fiber density, which is approximately 50% of the original fiber density of the material.
  2. 2. Filter according to claim l, characterized in that the pores (5) have an average pore size (d) of about 0.1 mm to about 0.7 mm, preferably up to about 0.6 mm, measured at a fiber density which is about 50 V of the original fiber density of the material.
  3. 3. Filter according to claim 1, characterized in that the pores (5) have an average pore size (d) of about 0.1 mm to about 0.4 mm, preferably up to about 0.3 mm, measured at a fiber density which is about Is 50% of the original fiber density of the material.
  4. 4. Filter according to one of the preceding claims, characterized in that at a pore size (dgo) which corresponds to 90% of the average pore size (d), the fiber density is about 0% to about 40% of the original fiber density of the material.
  5. 5. Filter according to one of the preceding claims, characterized in that at a pore size (dgo) which corresponds to 90% of the average pore size (d), the fiber density is about * 0% to about 20% of the original fiber density of the material.
  6. 6. Filter according to one of the preceding claims, characterized in that with a pore size (dgo) which corresponds to 90% of the average pore size (d), the fiber density 12 AT 000 823 Ul about 5% to about 15% of the original fiber density of the material is.
  7. 7. Filter according to one of the preceding claims, characterized in that at a pore size (d90) which corresponds to 90% of the average pore size (d), the fiber density is about 10% of the original fiber density of the material.
  8. 8. Filter according to one of the preceding claims, characterized in that the filter has a free pore area which is up to about 20% of the total filter area.
  9. 9. Filter according to one of the preceding claims, characterized in that the filter (1) is made of suitable paper.
  10. 10. Filter according to one of the preceding claims, characterized in that the pores (5) are produced by needling the fibrous material.
  11. 11. Filter according to one of claims 1 to 9, characterized in that the pores (5) are produced by water jets of the fibrous material.
  12. 12. Filter according to one of the preceding claims, characterized in that the average pore size (d) and / or the areal density of the pores (5) increases to the area of the filter (1) located below in use.
  13. 13. Filter according to one of the preceding claims, characterized in that the pores (5) are designed and arranged so that they form a perforation (4) to reduce the filter (1) when separating the perforation (4), so that it can be used in a smaller filter holder. 13 AT 000 823 Ul
  14. 14. Filter according to one of the preceding claims, characterized in that the pores (5) are designed and arranged such that they form kink lines (6) which support the opening of the filter (1) when inserted into the filter holder.
  15. 15. A method for producing a filter, in particular according to one of the preceding claims, with the method steps: providing a fibrous material and forming pores (5) in the material with an average pore size (d) of at least about 0.1 mm measured at a Fiber density, which is about 50% of the original fiber density of the material.
  16. 16. The method according to claim 15, characterized in that the pores (5) are formed by needles.
  17. 17. The method according to claim 15 or 16, characterized in that the pores (5) are formed by rolling the material with a needle roller.
  18. 18. The method according to claim 15, characterized in that the pores (5) are formed by water jets of the material. 14
AT49595U 1995-04-10 1995-09-13 Filters for brewing beverages, in particular coffee filters and method for producing such a filter AT823U1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19513600A DE19513600C5 (en) 1995-04-10 1995-04-10 Filter for infused drinks, in particular coffee filters and method for producing such a filter

Publications (1)

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AT823U1 true AT823U1 (en) 1996-06-25

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AT49595U AT823U1 (en) 1995-04-10 1995-09-13 Filters for brewing beverages, in particular coffee filters and method for producing such a filter
AT99113600T AT239411T (en) 1995-04-10 1996-04-09 Filters for brewing beverages, in particular coffee filters, and method for producing such a filter
AT96910033T AT194907T (en) 1995-04-10 1996-04-09 Filters for brewing beverages, in particular coffee filters, and method for producing such a filter

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AT99113600T AT239411T (en) 1995-04-10 1996-04-09 Filters for brewing beverages, in particular coffee filters, and method for producing such a filter
AT96910033T AT194907T (en) 1995-04-10 1996-04-09 Filters for brewing beverages, in particular coffee filters, and method for producing such a filter

Country Status (19)

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US (1) US5871644A (en)
EP (2) EP0951854B1 (en)
JP (1) JP3037436B2 (en)
AT (3) AT823U1 (en)
AU (1) AU692701B2 (en)
BR (1) BR9606303A (en)
CA (1) CA2192474C (en)
CZ (1) CZ293116B6 (en)
DE (3) DE19513600C5 (en)
DK (2) DK0763994T3 (en)
EE (1) EE9600187A (en)
ES (2) ES2195481T3 (en)
FR (1) FR2732576B3 (en)
HU (1) HU9603411A3 (en)
NO (1) NO313904B1 (en)
PL (1) PL179588B1 (en)
RO (1) RO117889B1 (en)
SK (1) SK156596A3 (en)
WO (1) WO1996032043A1 (en)

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DE29818568U1 (en) * 1998-10-17 2000-03-30 Melitta Haushaltsprodukte Filter paper insert for the production of aroma extracts from coffee or tea
EP1194059A1 (en) * 1999-07-13 2002-04-10 Braun GmbH Filter bag consisting of filter paper for producing brewed beverages such as coffee or tea, stack of filter bags of this type and method for producing filter bags of this type
DE10059971A1 (en) * 2000-12-02 2002-06-20 Melitta Haushaltsprodukte Bag-like filter insert made from filter paper
US20040265436A1 (en) * 2002-07-06 2004-12-30 Cai Edward Z Coffee filter paper and method of use
DE20103730U1 (en) * 2001-03-03 2001-05-03 Melitta Haushaltsprodukte Filter paper insert for the production of aroma extracts from ground coffee
US6811588B2 (en) * 2002-11-01 2004-11-02 Advanced Flow Engineering, Inc. High capacity hybrid multi-layer automotive air filter
US20080038441A1 (en) * 2003-07-22 2008-02-14 The Coca-Cola Company Systems and Methods of Brewing Low-Cholesterol Espresso
US20060021930A1 (en) * 2004-07-30 2006-02-02 Cai Edward Z Coffee paper filters and method of use
US8677966B2 (en) 2011-01-20 2014-03-25 Advanced Flow Engineering, Inc. Air intake flow device and system
US20140348984A1 (en) * 2011-03-28 2014-11-27 Intercontinental Great Brands Llc Filter element having microperforations for enabling the passage of fluids during brewing
CL2011001074A1 (en) 2011-05-12 2011-07-29 Inversiones San Juan De La Cruz Spa Disposable cartridge to filter soluble elements such as herbs, consisting of a template with a central section that constitutes the container and two overlapping oblique side sections that make up a straight wall, and have an extension with a handle and tabs for fixing to a circular edge of a glass.
USD666447S1 (en) * 2011-06-27 2012-09-04 Mr. Bar-B-Q-, Inc. Floor mat
CA2788283C (en) 2011-09-01 2019-11-26 2266170 Ontario Inc. Beverage capsule
EP2606777A1 (en) 2011-12-23 2013-06-26 Melitta Europa GmbH & Co. KG Filter paper insert
CA2833096C (en) 2012-11-12 2016-05-31 2266170 Ontario Inc. Beverage capsule and process and system for making same
US9700171B2 (en) 2013-04-03 2017-07-11 2266170 Ontario Inc. Capsule machine and components
WO2014186897A1 (en) 2013-05-23 2014-11-27 2266170 Ontario Inc. Capsule housing
WO2015024125A1 (en) 2013-08-20 2015-02-26 2266170 Ontario Inc. A capsule containing a dosing agent and system and process for making same
US10314319B2 (en) * 2013-11-20 2019-06-11 2266170 Ontario Inc. Method and apparatus for accelerated or controlled degassing of roasted coffee
US10336531B2 (en) 2014-03-21 2019-07-02 2266170 Ontario Inc. Capsule with steeping chamber
JP2020006064A (en) * 2018-07-12 2020-01-16 日本製紙パピリア株式会社 Coffee filter paper

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NO313904B1 (en) 2002-12-23
CA2192474A1 (en) 1996-10-17
EP0763994A1 (en) 1997-03-26
DK0763994T3 (en) 2000-11-13
AU692701B2 (en) 1998-06-11
PL317465A1 (en) 1997-04-14
ES2195481T3 (en) 2003-12-01
AT239411T (en) 2003-05-15
EE9600187A (en) 1997-06-16
JP3037436B2 (en) 2000-04-24
FR2732576A3 (en) 1996-10-11
CA2192474C (en) 2005-05-10
WO1996032043A1 (en) 1996-10-17
EP0763994B1 (en) 2000-07-26
ES2148747T3 (en) 2000-10-16
DE19513600C2 (en) 1999-11-25
DE19513600C5 (en) 2007-10-18
AT194907T (en) 2000-08-15
DE19513600A1 (en) 1996-10-17
RO117889B1 (en) 2002-09-30
JPH10501453A (en) 1998-02-10
HU9603411A2 (en) 1998-03-02
BR9606303A (en) 1997-09-09
NO965196L (en) 1997-01-28
DK0951854T3 (en) 2003-07-21
FR2732576B3 (en) 1997-03-07
DE59610428D1 (en) 2003-06-12
DK763994T3 (en)
US5871644A (en) 1999-02-16
NO965196D0 (en) 1996-12-05
PL179588B1 (en) 2000-09-29
HU9603411A3 (en) 1999-09-28
EP0951854A1 (en) 1999-10-27
SK156596A3 (en) 1997-06-04
CZ354196A3 (en) 1999-09-15
AU5335496A (en) 1996-10-30
EP0951854B1 (en) 2003-05-07
DE59605640D1 (en) 2000-08-31
CZ293116B6 (en) 2004-02-18

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